ID

VAR-202011-0423

CVE

CVE-2020-15436

TITLE

Linux Kernel  Vulnerability in using free memory in

DESCRIPTION

Use-after-free vulnerability in fs/block_dev.c in the Linux kernel before 5.8 allows local users to gain privileges or cause a denial of service by leveraging improper access to a certain error field. Linux Kernel Exists in a vulnerability related to the use of freed memory.Information is obtained, information is tampered with, and service operation is interrupted. (DoS) It may be in a state. Red Hat Advanced Cluster Management for Kubernetes provides the capabilities to address common challenges that administrators and site reliability engineers face as they work across a range of public and private cloud environments. Clusters and applications are all visible and managed from a single console—with security policy built in. Bug fix: * RHACM 2.0.8 images (BZ #1915461) 3. Solution: Before applying this update, make sure all previously released errata relevant to your system have been applied. Bugs fixed (https://bugzilla.redhat.com/): 1915461 - RHACM 2.0.8 images 1921650 - CVE-2021-3121 gogo/protobuf: plugin/unmarshal/unmarshal.go lacks certain index validation 5. 7.6) - ppc64, ppc64le, x86_64 3. Bug Fix(es): * [infiniband] Backport Request to fix Multicast Sendonly joins (BZ#1937820) 4. Bugs fixed (https://bugzilla.redhat.com/): 1899804 - CVE-2020-28374 kernel: SCSI target (LIO) write to any block on ILO backstore 1901168 - CVE-2020-15436 kernel: use-after-free in fs/block_dev.c 1930078 - CVE-2021-27365 kernel: heap buffer overflow in the iSCSI subsystem 1930079 - CVE-2021-27363 kernel: iscsi: unrestricted access to sessions and handles 1930080 - CVE-2021-27364 kernel: out-of-bounds read in libiscsi module 6. 7) - noarch, x86_64 3. Bug Fix(es): * kernel-rt: update to the latest RHEL7.9.z3 source tree (BZ#1906133) * [kernel-rt] WARNING: CPU: 8 PID: 586 at kernel/sched/core.c:3644 migrate_enable+0x15f/0x210 (BZ#1916123) * [kernel-rt-debug] [ BUG: bad unlock balance detected! ] [RHEL-7.9.z] (BZ#1916130) 4. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Moderate: kernel security, bug fix, and enhancement update Advisory ID: RHSA-2021:0336-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:0336 Issue date: 2021-02-02 CVE Names: CVE-2020-15436 CVE-2020-35513 ==================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. 2. Relevant releases/architectures: Red Hat Enterprise Linux Client (v. 7) - noarch, x86_64 Red Hat Enterprise Linux Client Optional (v. 7) - x86_64 Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64 Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64 Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, x86_64 Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64 Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64 3. Description: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * kernel: use-after-free in fs/block_dev.c (CVE-2020-15436) * kernel: Nfsd failure to clear umask after processing an open or create (CVE-2020-35513) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. Bug Fix(es): * double free issue in filelayout_alloc_commit_info (BZ#1679980) * Regression: Plantronics Device SHS2355-11 PTT button does not work after update to 7.7 (BZ#1769502) * Openstack network node reports unregister_netdevice: waiting for qr-3cec0c92-9a to become free. Usage count = 1 (BZ#1809519) * dlm: add ability to interrupt waiting for acquire POSIX lock (BZ#1826858) * [Azure][RHEL7] soft lockups and performance loss occurring during final fsync with parallel dd writes to xfs filesystem in azure instance (BZ#1859364) * Guest crashed when hotplug vcpus on booting kernel stage (BZ#1866138) * soft lockup occurs while a thread group leader is waiting on tasklist_waiters in mm_update_next_owner() where a huge number of the thread group members are exiting and trying to take the tasklist_lock. (BZ#1872110) * [DELL EMC 7.6 BUG] Kioxia CM6 NVMe drive fails to enumerate (BZ#1883403) * [Hyper-V][RHEL7] Request to included a commit that adds a timeout to vmbus_wait_for_unload (BZ#1888979) * Unable to discover the LUNs from new storage port (BZ#1889311) * RHEL 7.9 Kernel panic at ceph_put_snap_realm+0x21 (BZ#1890386) * A hard lockup occurrs where one task is looping in an sk_lock spinlock that has been taken by another task running timespec64_add_ns(). (BZ#1890911) * ethtool/mlx5_core provides incorrect SFP module info (BZ#1896756) * RHEL7.7 - zcrypt: Fix ZCRYPT_PERDEV_REQCNT ioctl (BZ#1896826) * RHEL7.7 - s390/dasd: Fix zero write for FBA devices (BZ#1896839) * [Azure]IP forwarding issue in netvsc[7.9.z] (BZ#1898280) * Security patch for CVE-2020-25212 breaks directory listings via 'ls' on NFS V4.2 shares mounted with selinux enabled labels (BZ#1917504) Enhancement(s): * RFE : handle better ERRbaduid on SMB1 (BZ#1847041) 4. Solution: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. 5. Bugs fixed (https://bugzilla.redhat.com/): 1901168 - CVE-2020-15436 kernel: use-after-free in fs/block_dev.c 1905208 - CVE-2020-35513 kernel: fix nfsd failure to clear umask after processing an open or create [rhel-7] 1911309 - CVE-2020-35513 kernel: Nfsd failure to clear umask after processing an open or create 1917504 - Security patch for CVE-2020-25212 breaks directory listings via 'ls' on NFS V4.2 shares mounted with selinux enabled labels 6. Package List: Red Hat Enterprise Linux Client (v. 7): Source: kernel-3.10.0-1160.15.2.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-1160.15.2.el7.noarch.rpm kernel-doc-3.10.0-1160.15.2.el7.noarch.rpm x86_64: bpftool-3.10.0-1160.15.2.el7.x86_64.rpm bpftool-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.15.2.el7.x86_64.rpm kernel-devel-3.10.0-1160.15.2.el7.x86_64.rpm kernel-headers-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-1160.15.2.el7.x86_64.rpm perf-3.10.0-1160.15.2.el7.x86_64.rpm perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm python-perf-3.10.0-1160.15.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm Red Hat Enterprise Linux Client Optional (v. 7): x86_64: bpftool-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-1160.15.2.el7.x86_64.rpm perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm Red Hat Enterprise Linux ComputeNode (v. 7): Source: kernel-3.10.0-1160.15.2.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-1160.15.2.el7.noarch.rpm kernel-doc-3.10.0-1160.15.2.el7.noarch.rpm x86_64: bpftool-3.10.0-1160.15.2.el7.x86_64.rpm bpftool-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.15.2.el7.x86_64.rpm kernel-devel-3.10.0-1160.15.2.el7.x86_64.rpm kernel-headers-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-1160.15.2.el7.x86_64.rpm perf-3.10.0-1160.15.2.el7.x86_64.rpm perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm python-perf-3.10.0-1160.15.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm Red Hat Enterprise Linux ComputeNode Optional (v. 7): x86_64: bpftool-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-1160.15.2.el7.x86_64.rpm perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm Red Hat Enterprise Linux Server (v. 7): Source: kernel-3.10.0-1160.15.2.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-1160.15.2.el7.noarch.rpm kernel-doc-3.10.0-1160.15.2.el7.noarch.rpm ppc64: bpftool-3.10.0-1160.15.2.el7.ppc64.rpm bpftool-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm kernel-3.10.0-1160.15.2.el7.ppc64.rpm kernel-bootwrapper-3.10.0-1160.15.2.el7.ppc64.rpm kernel-debug-3.10.0-1160.15.2.el7.ppc64.rpm kernel-debug-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm kernel-debug-devel-3.10.0-1160.15.2.el7.ppc64.rpm kernel-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-1160.15.2.el7.ppc64.rpm kernel-devel-3.10.0-1160.15.2.el7.ppc64.rpm kernel-headers-3.10.0-1160.15.2.el7.ppc64.rpm kernel-tools-3.10.0-1160.15.2.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm kernel-tools-libs-3.10.0-1160.15.2.el7.ppc64.rpm perf-3.10.0-1160.15.2.el7.ppc64.rpm perf-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm python-perf-3.10.0-1160.15.2.el7.ppc64.rpm python-perf-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm ppc64le: bpftool-3.10.0-1160.15.2.el7.ppc64le.rpm bpftool-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm kernel-3.10.0-1160.15.2.el7.ppc64le.rpm kernel-bootwrapper-3.10.0-1160.15.2.el7.ppc64le.rpm kernel-debug-3.10.0-1160.15.2.el7.ppc64le.rpm kernel-debug-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm kernel-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-1160.15.2.el7.ppc64le.rpm kernel-devel-3.10.0-1160.15.2.el7.ppc64le.rpm kernel-headers-3.10.0-1160.15.2.el7.ppc64le.rpm kernel-tools-3.10.0-1160.15.2.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm kernel-tools-libs-3.10.0-1160.15.2.el7.ppc64le.rpm perf-3.10.0-1160.15.2.el7.ppc64le.rpm perf-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm python-perf-3.10.0-1160.15.2.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm s390x: bpftool-3.10.0-1160.15.2.el7.s390x.rpm bpftool-debuginfo-3.10.0-1160.15.2.el7.s390x.rpm kernel-3.10.0-1160.15.2.el7.s390x.rpm kernel-debug-3.10.0-1160.15.2.el7.s390x.rpm kernel-debug-debuginfo-3.10.0-1160.15.2.el7.s390x.rpm kernel-debug-devel-3.10.0-1160.15.2.el7.s390x.rpm kernel-debuginfo-3.10.0-1160.15.2.el7.s390x.rpm kernel-debuginfo-common-s390x-3.10.0-1160.15.2.el7.s390x.rpm kernel-devel-3.10.0-1160.15.2.el7.s390x.rpm kernel-headers-3.10.0-1160.15.2.el7.s390x.rpm kernel-kdump-3.10.0-1160.15.2.el7.s390x.rpm kernel-kdump-debuginfo-3.10.0-1160.15.2.el7.s390x.rpm kernel-kdump-devel-3.10.0-1160.15.2.el7.s390x.rpm perf-3.10.0-1160.15.2.el7.s390x.rpm perf-debuginfo-3.10.0-1160.15.2.el7.s390x.rpm python-perf-3.10.0-1160.15.2.el7.s390x.rpm python-perf-debuginfo-3.10.0-1160.15.2.el7.s390x.rpm x86_64: bpftool-3.10.0-1160.15.2.el7.x86_64.rpm bpftool-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.15.2.el7.x86_64.rpm kernel-devel-3.10.0-1160.15.2.el7.x86_64.rpm kernel-headers-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-1160.15.2.el7.x86_64.rpm perf-3.10.0-1160.15.2.el7.x86_64.rpm perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm python-perf-3.10.0-1160.15.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm Red Hat Enterprise Linux Server Optional (v. 7): ppc64: bpftool-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm kernel-debug-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm kernel-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm kernel-debuginfo-common-ppc64-3.10.0-1160.15.2.el7.ppc64.rpm kernel-tools-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm kernel-tools-libs-devel-3.10.0-1160.15.2.el7.ppc64.rpm perf-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm python-perf-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm ppc64le: bpftool-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm kernel-debug-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm kernel-debug-devel-3.10.0-1160.15.2.el7.ppc64le.rpm kernel-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm kernel-debuginfo-common-ppc64le-3.10.0-1160.15.2.el7.ppc64le.rpm kernel-tools-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm kernel-tools-libs-devel-3.10.0-1160.15.2.el7.ppc64le.rpm perf-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm python-perf-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm x86_64: bpftool-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-1160.15.2.el7.x86_64.rpm perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm Red Hat Enterprise Linux Workstation (v. 7): Source: kernel-3.10.0-1160.15.2.el7.src.rpm noarch: kernel-abi-whitelists-3.10.0-1160.15.2.el7.noarch.rpm kernel-doc-3.10.0-1160.15.2.el7.noarch.rpm x86_64: bpftool-3.10.0-1160.15.2.el7.x86_64.rpm bpftool-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-devel-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.15.2.el7.x86_64.rpm kernel-devel-3.10.0-1160.15.2.el7.x86_64.rpm kernel-headers-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-libs-3.10.0-1160.15.2.el7.x86_64.rpm perf-3.10.0-1160.15.2.el7.x86_64.rpm perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm python-perf-3.10.0-1160.15.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm Red Hat Enterprise Linux Workstation Optional (v. 7): x86_64: bpftool-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-1160.15.2.el7.x86_64.rpm perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm python-perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/ 7. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2021 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBYBlBsdzjgjWX9erEAQhTZhAAmSFzEZeB0CWYNaJ2PVwoFm4PA9rdYDyg G1j/plxrO6bczNEz+XDnAzRPrCbJRPPt6VJxjpLkb25ph0f5tQ+Q7Ph7sAefSbDX BLDjjvl+Wd1g2FEfIQ43wDp8UWuFCVVMF3ajJHFz9ROqrA/1hs0gj7ht9gXRlttT LSI67A08tEWRPtaf5c1M8h/IJtZiF4sfYDrfhp4mFRTZYybTvVjML+xf69Qq7o2D AsxbyKRVNQKC0Epm6C+Tzbw6SxhonrAQyjADWenQ8bCS2TF8WY2OZA7sNs7nddZu Ha/mCB2vSR2WCWLGxCLXTtsK3y52qPIyUn4mBmatJUIBcbJMnQbgZgWrEcTobsoD N5MWdqE6xGjct0KMz0fV6J9D5JWQjUN4O8K0vVQP4aoAX25jMWCq14RLLRUvusJm dLI59E5nN1pLMlADiAAh2Iceac/daIF9fvWn2XoF16/ZQNffa0yCiNFaDg+AW4Tg Z/b82VoOiz7uJWyv06TMcljafEaIxjpnjGmpKQ2qz8UYoxYYsnRyKpHJxLeiB53A TKbkiQJoFutNeUcbBSA6F6sqLlaJ7CtoyzxsVVwM+LtYF1iUXqC+Hp6Gs5NB8WXr JQSrrv0X0H7sAu7FHCyL/ygMQK/IiZKiPxiRBZJH6pJz5OL8GVKxR1CSZmHXvgKo QPLPtfMOGPs=Hdxh -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . 7) - aarch64, noarch, ppc64le 3. ========================================================================== Ubuntu Security Notice USN-4752-1 February 25, 2021 linux-oem-5.6 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-oem-5.6: Linux kernel for OEM systems Details: Daniele Antonioli, Nils Ole Tippenhauer, and Kasper Rasmussen discovered that legacy pairing and secure-connections pairing authentication in the Bluetooth protocol could allow an unauthenticated user to complete authentication without pairing credentials via adjacent access. A physically proximate attacker could use this to impersonate a previously paired Bluetooth device. (CVE-2020-10135) Jay Shin discovered that the ext4 file system implementation in the Linux kernel did not properly handle directory access with broken indexing, leading to an out-of-bounds read vulnerability. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-14314) It was discovered that the block layer implementation in the Linux kernel did not properly perform reference counting in some situations, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-15436) It was discovered that the serial port driver in the Linux kernel did not properly initialize a pointer in some situations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2020-15437) Andy Nguyen discovered that the Bluetooth HCI event packet parser in the Linux kernel did not properly handle event advertisements of certain sizes, leading to a heap-based buffer overflow. A physically proximate remote attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-24490) It was discovered that the NFS client implementation in the Linux kernel did not properly perform bounds checking before copying security labels in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-25212) It was discovered that the Rados block device (rbd) driver in the Linux kernel did not properly perform privilege checks for access to rbd devices in some situations. A local attacker could use this to map or unmap rbd block devices. (CVE-2020-25284) It was discovered that the block layer subsystem in the Linux kernel did not properly handle zero-length requests. A local attacker could use this to cause a denial of service. (CVE-2020-25641) It was discovered that the HDLC PPP implementation in the Linux kernel did not properly validate input in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-25643) Kiyin (尹亮) discovered that the perf subsystem in the Linux kernel did not properly deallocate memory in some situations. A privileged attacker could use this to cause a denial of service (kernel memory exhaustion). (CVE-2020-25704) It was discovered that the KVM hypervisor in the Linux kernel did not properly handle interrupts in certain situations. A local attacker in a guest VM could possibly use this to cause a denial of service (host system crash). (CVE-2020-27152) It was discovered that the jfs file system implementation in the Linux kernel contained an out-of-bounds read vulnerability. A local attacker could use this to possibly cause a denial of service (system crash). (CVE-2020-27815) It was discovered that an information leak existed in the syscall implementation in the Linux kernel on 32 bit systems. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-28588) It was discovered that the framebuffer implementation in the Linux kernel did not properly perform range checks in certain situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-28915) Jann Horn discovered a race condition in the copy-on-write implementation in the Linux kernel when handling hugepages. A local attacker could use this to gain unintended write access to read-only memory pages. (CVE-2020-29368) Jann Horn discovered that the mmap implementation in the Linux kernel contained a race condition when handling munmap() operations, leading to a read-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information. (CVE-2020-29369) Jann Horn discovered that the romfs file system in the Linux kernel did not properly validate file system meta-data, leading to an out-of-bounds read. An attacker could use this to construct a malicious romfs image that, when mounted, exposed sensitive information (kernel memory). (CVE-2020-29371) Jann Horn discovered that the tty subsystem of the Linux kernel did not use consistent locking in some situations, leading to a read-after-free vulnerability. (CVE-2020-29660) Jann Horn discovered a race condition in the tty subsystem of the Linux kernel in the locking for the TIOCSPGRP ioctl(), leading to a use-after- free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-29661) It was discovered that a race condition existed that caused the Linux kernel to not properly restrict exit signal delivery. A local attacker could possibly use this to send signals to arbitrary processes. (CVE-2020-35508) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: linux-image-5.6.0-1048-oem 5.6.0-1048.52 linux-image-oem-20.04 5.6.0.1048.44 After a standard system update you need to reboot your computer to make all the necessary changes. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. References: https://usn.ubuntu.com/4752-1 CVE-2020-10135, CVE-2020-14314, CVE-2020-15436, CVE-2020-15437, CVE-2020-24490, CVE-2020-25212, CVE-2020-25284, CVE-2020-25641, CVE-2020-25643, CVE-2020-25704, CVE-2020-27152, CVE-2020-27815, CVE-2020-28588, CVE-2020-28915, CVE-2020-29368, CVE-2020-29369, CVE-2020-29371, CVE-2020-29660, CVE-2020-29661, CVE-2020-35508 Package Information: https://launchpad.net/ubuntu/+source/linux-oem-5.6/5.6.0-1048.52

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

local

TYPE

resource management error

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Red Hat

SOURCES

LAST UPDATE DATE

2024-08-14T12:30:44.343000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE