ID

VAR-201808-1002

CVE

CVE-2018-5390

TITLE

TCP implementations vulnerable to Denial of Service

DESCRIPTION

Linux kernel versions 4.9+ can be forced to make very expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() for every incoming packet which can lead to a denial of service. An input validation error vulnerability exists in the Linux kernel version 4.9+. Description: The RHV-M Virtual Appliance automates the process of installing and configuring the Red Hat Virtualization Manager. The appliance is available to download as an OVA file from the Customer Portal. Security Fix(es): * Modern operating systems implement virtualization of physical memory to efficiently use available system resources and provide inter-domain protection through access control and isolation. The L1TF issue was found in the way the x86 microprocessor designs have implemented speculative execution of instructions (a commonly used performance optimisation) in combination with handling of page-faults caused by terminated virtual to physical address resolving process. As a result, an unprivileged attacker could use this flaw to read privileged memory of the kernel or other processes and/or cross guest/host boundaries to read host memory by conducting targeted cache side-channel attacks. (CVE-2018-11506) Wen Xu discovered that the ext4 file system implementation in the Linux kernel did not properly initialize the crc32c checksum driver. (CVE-2018-1094) The inode_init_owner function in fs/inode.c in the Linux kernel through 4.17.4 allows local users to create files with an unintended group ownership, in a scenario where a directory is SGID to a certain group and is writable by a user who is not a member of that group. Here, the non-member can trigger creation of a plain file whose group ownership is that group. The intended behavior was that the non-member can trigger creation of a directory (but not a plain file) whose group ownership is that group. The non-member can escalate privileges by making the plain file executable and SGID. An OOPS may occur for a corrupted xfs image after xfs_da_shrink_inode() is called with a NULL bp. (CVE-2018-5390) Update instructions: The problem can be corrected by updating your livepatches to the following versions: | Kernel | Version | flavors | |--------------------------+----------+--------------------------| | 4.4.0-124.148 | 41.2 | lowlatency, generic | | 4.4.0-124.148~14.04.1 | 41.2 | generic, lowlatency | | 4.4.0-127.153 | 41.2 | lowlatency, generic | | 4.4.0-127.153~14.04.1 | 41.2 | lowlatency, generic | | 4.4.0-128.154 | 41.2 | generic, lowlatency | | 4.4.0-128.154~14.04.1 | 41.2 | generic, lowlatency | | 4.4.0-130.156 | 41.2 | generic, lowlatency | | 4.4.0-130.156~14.04.1 | 41.2 | lowlatency, generic | | 4.4.0-131.157 | 41.2 | lowlatency, generic | | 4.4.0-131.157~14.04.1 | 41.2 | lowlatency, generic | | 4.15.0-20.21 | 41.2 | generic, lowlatency | | 4.15.0-22.24 | 41.2 | lowlatency, generic | | 4.15.0-23.25 | 41.2 | lowlatency, generic | | 4.15.0-24.26 | 41.2 | lowlatency, generic | | 4.15.0-29.31 | 41.2 | generic, lowlatency | References: CVE-2018-11506, CVE-2018-1094, CVE-2018-13405, CVE-2018-13094, CVE-2018-5390 -- ubuntu-security-announce mailing list ubuntu-security-announce@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-security-announce . Description: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Bug Fix(es): * The kernel-rt packages have been upgraded to the 3.10.0-693.39.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1616431) * Previously, preemption was enabled too early after a context switch. If a task was migrated to another CPU after a context switch, a mismatch between CPU and runqueue during load balancing sometimes occurred. Consequently, a runnable task on an idle CPU failed to run, and the operating system became unresponsive. As a result, CPU migration during post-schedule processing no longer occurs, which prevents the above mismatch. (BZ#1618466) 4. ========================================================================= Ubuntu Security Notice USN-3742-2 August 14, 2018 linux-lts-trusty vulnerabilities ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 12.04 ESM Summary: Several security issues were fixed in the Linux kernel. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 14.04 for Ubuntu 12.04 ESM. It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local attacker in a guest virtual machine could use this to expose sensitive information (memory from other guests or the host OS). (CVE-2018-3646) It was discovered that memory present in the L1 data cache of an Intel CPU core may be exposed to a malicious process that is executing on the CPU core. This vulnerability is also known as L1 Terminal Fault (L1TF). (CVE-2018-3620) Andrey Konovalov discovered an out-of-bounds read in the POSIX timers subsystem in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or expose sensitive information. A remote attacker could use this to cause a denial of service. A remote attacker could use this to cause a denial of service. (CVE-2018-5391) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 12.04 ESM: linux-image-3.13.0-155-generic 3.13.0-155.206~precise1 linux-image-3.13.0-155-generic-lpae 3.13.0-155.206~precise1 linux-image-generic-lpae-lts-trusty 3.13.0.155.145 linux-image-generic-lts-trusty 3.13.0.155.145 Please note that the recommended mitigation for CVE-2018-3646 involves updating processor microcode in addition to updating the kernel; however, the kernel includes a fallback for processors that have not received microcode updates. 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. For the stable distribution (stretch), these problems have been fixed in version 4.9.110-3+deb9u1. This update includes fixes for several regressions in the latest point release. For the detailed security status of linux please refer to its security tracker page at: https://security-tracker.debian.org/tracker/linux Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailing list: debian-security-announce@lists.debian.org -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEERkRAmAjBceBVMd3uBUy48xNDz0QFAltolY5fFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldDQ2 NDQ0MDk4MDhDMTcxRTA1NTMxRERFRTA1NENCOEYzMTM0M0NGNDQACgkQBUy48xND z0T1cBAAhxrsiYuYMiQj9x+shNxxp6gWEXpDoOCwU0cXzZ2lii2uSPzP5TsIQey3 3nBjPCZthg8Q0fL2m0thbfS+i1HTT9tlJT7EjBGDjA0jm2o/lQCmH5rp8DDPtbwZ 2iZ9HyfosEFnbCd6VHtWIM3NoGZFUjvBWkb29/op800BqkHk69WchT1ZWSE8G85S NAwG7tf/mfWIc0nYgieFo9i2X2bk0mNUOjC8xnVnK2TZY5jzK7f9fmQzdPAglZaI t1UoQS4PMl6UTi7AJephorP6+6KJPg3n0rCgJYYXtnRO4PilSLveg7dNniKpCaDo jJKVIcug8Hqo1zc6Uk0tgdZBPILZULyMGr7XUJ97cyA6i+9xhDpGPmqH6pbWQ+YZ JplAY4PHZ2PUi+6is4LE7kYQfPk8+KvvshUB8Qr2Xa61GUDcgpdcaTmNmFYH3EAF St27o/Nbs8WsKNzkOMxtyva88YJr7RDHr+nX/I1fKlI8zC8k3gHYYtJ11QhCDWKT 1O42ppxxaBUMo5ns0ZCjNBaMFPTaKrDYocAzhVot94I2++8InhFWbAzRq7B44fKe E4Q6jDXY3x5MexSyZG3sGc6EwUtr/Gr8trB4TZkvNrQtZ9WBh28TOsldecGsncqw I62eV7vx701dQDjtcDy/yZlGDjFTULQkyX8GPL9hIBeRjCFRhrA= =h8it -----END PGP SIGNATURE----- . Bug Fix(es): * Previously, the early microcode updater in the kernel was trying to perform a microcode update on virtualized guests. As a consequence, the virtualized guests sometimes mishandled the request to perform the microcode update and became unresponsive in the early boot stage. (BZ#1618386) 4. 6.5) - x86_64 3. Bug Fix(es): * Previously, invalid headers in the sk_buff struct led to an indefinite loop in the tcp_collapse() function. As a consequence, the system became unresponsive. This update backports the upstream changes that remove the problematic code in tcp_collapse(). (BZ#1629632) 4. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 ==================================================================== Red Hat Security Advisory Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2018:2924-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2018:2924 Issue date: 2018-10-16 CVE Names: CVE-2018-5390 CVE-2018-5391 CVE-2018-10675 CVE-2018-14634 ==================================================================== 1. Summary: An update for kernel is now available for Red Hat Enterprise Linux 6.6 Advanced Update Support and Red Hat Enterprise Linux 6.6 Telco Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. 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 Server AUS (v. 6.6) - noarch, x86_64 Red Hat Enterprise Linux Server Optional AUS (v. 6.6) - x86_64 Red Hat Enterprise Linux Server Optional TUS (v. 6.6) - x86_64 Red Hat Enterprise Linux Server TUS (v. 6.6) - noarch, x86_64 3. Description: The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es): * A flaw named SegmentSmack was found in the way the Linux kernel handled specially crafted TCP packets. A remote attacker could use this flaw to trigger time and calculation expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() functions by sending specially modified packets within ongoing TCP sessions which could lead to a CPU saturation and hence a denial of service on the system. Maintaining the denial of service condition requires continuous two-way TCP sessions to a reachable open port, thus the attacks cannot be performed using spoofed IP addresses. (CVE-2018-5390) * A flaw named FragmentSmack was found in the way the Linux kernel handled reassembly of fragmented IPv4 and IPv6 packets. A remote attacker could use this flaw to trigger time and calculation expensive fragment reassembly algorithm by sending specially crafted packets which could lead to a CPU saturation and hence a denial of service on the system. (CVE-2018-5391) * kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact (CVE-2018-10675) * kernel: Integer overflow in Linux's create_elf_tables function (CVE-2018-14634) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section. Red Hat would like to thank Juha-Matti Tilli (Aalto University - Department of Communications and Networking and Nokia Bell Labs) for reporting CVE-2018-5390 and CVE-2018-5391 and Qualys Research Labs for reporting CVE-2018-14634. Bug Fix(es): * After updating the system to prevent the L1 Terminal Fault (L1TF) vulnerability, only one thread was detected on systems that offer processing of two threads on a single processor core. With this update, the "__max_smt_threads()" function has been fixed. As a result, both threads are now detected correctly in the described situation. (BZ#1625334) * Previously, a kernel panic occurred when the kernel tried to make an out of bound access to the array that describes the L1 Terminal Fault (L1TF) mitigation state on systems without Extended Page Tables (EPT) support. This update extends the array of mitigation states to cover all the states, which effectively prevents out of bound array access. Also, this update enables rejecting invalid, irrelevant values, that might be erroneously provided by the userspace. As a result, the kernel no longer panics in the described scenario. (BZ#1629633) 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/): 1575065 - CVE-2018-10675 kernel: mm: use-after-free in do_get_mempolicy function allows local DoS or other unspecified impact 1601704 - CVE-2018-5390 kernel: TCP segments with random offsets allow a remote denial of service (SegmentSmack) 1609664 - CVE-2018-5391 kernel: IP fragments with random offsets allow a remote denial of service (FragmentSmack) 1624498 - CVE-2018-14634 kernel: Integer overflow in Linux's create_elf_tables function 6. Package List: Red Hat Enterprise Linux Server AUS (v. 6.6): Source: kernel-2.6.32-504.76.2.el6.src.rpm noarch: kernel-abi-whitelists-2.6.32-504.76.2.el6.noarch.rpm kernel-doc-2.6.32-504.76.2.el6.noarch.rpm kernel-firmware-2.6.32-504.76.2.el6.noarch.rpm x86_64: kernel-2.6.32-504.76.2.el6.x86_64.rpm kernel-debug-2.6.32-504.76.2.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-504.76.2.el6.x86_64.rpm kernel-debug-devel-2.6.32-504.76.2.el6.x86_64.rpm kernel-debuginfo-2.6.32-504.76.2.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-504.76.2.el6.x86_64.rpm kernel-devel-2.6.32-504.76.2.el6.x86_64.rpm kernel-headers-2.6.32-504.76.2.el6.x86_64.rpm perf-2.6.32-504.76.2.el6.x86_64.rpm perf-debuginfo-2.6.32-504.76.2.el6.x86_64.rpm python-perf-debuginfo-2.6.32-504.76.2.el6.x86_64.rpm Red Hat Enterprise Linux Server TUS (v. 6.6): Source: kernel-2.6.32-504.76.2.el6.src.rpm noarch: kernel-abi-whitelists-2.6.32-504.76.2.el6.noarch.rpm kernel-doc-2.6.32-504.76.2.el6.noarch.rpm kernel-firmware-2.6.32-504.76.2.el6.noarch.rpm x86_64: kernel-2.6.32-504.76.2.el6.x86_64.rpm kernel-debug-2.6.32-504.76.2.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-504.76.2.el6.x86_64.rpm kernel-debug-devel-2.6.32-504.76.2.el6.x86_64.rpm kernel-debuginfo-2.6.32-504.76.2.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-504.76.2.el6.x86_64.rpm kernel-devel-2.6.32-504.76.2.el6.x86_64.rpm kernel-headers-2.6.32-504.76.2.el6.x86_64.rpm perf-2.6.32-504.76.2.el6.x86_64.rpm perf-debuginfo-2.6.32-504.76.2.el6.x86_64.rpm python-perf-debuginfo-2.6.32-504.76.2.el6.x86_64.rpm Red Hat Enterprise Linux Server Optional AUS (v. 6.6): x86_64: kernel-debug-debuginfo-2.6.32-504.76.2.el6.x86_64.rpm kernel-debuginfo-2.6.32-504.76.2.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-504.76.2.el6.x86_64.rpm perf-debuginfo-2.6.32-504.76.2.el6.x86_64.rpm python-perf-2.6.32-504.76.2.el6.x86_64.rpm python-perf-debuginfo-2.6.32-504.76.2.el6.x86_64.rpm Red Hat Enterprise Linux Server Optional TUS (v. 6.6): x86_64: kernel-debug-debuginfo-2.6.32-504.76.2.el6.x86_64.rpm kernel-debuginfo-2.6.32-504.76.2.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-504.76.2.el6.x86_64.rpm perf-debuginfo-2.6.32-504.76.2.el6.x86_64.rpm python-perf-2.6.32-504.76.2.el6.x86_64.rpm python-perf-debuginfo-2.6.32-504.76.2.el6.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. References: https://access.redhat.com/security/cve/CVE-2018-5390 https://access.redhat.com/security/cve/CVE-2018-5391 https://access.redhat.com/security/cve/CVE-2018-10675 https://access.redhat.com/security/cve/CVE-2018-14634 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/articles/3553061 https://access.redhat.com/security/vulnerabilities/mutagen-astronomy 8. Contact: The Red Hat security contact is <secalert@redhat.com>. More contact details at https://access.redhat.com/security/team/contact/ Copyright 2018 Red Hat, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIVAwUBW8X6otzjgjWX9erEAQj5OQ/+O0GjLYqyc0dlDxIBFWYXEGkMxGpwpgR1 HpF5FKVo32x78i8M/mQXTEtnwJxfGH+ABkYUPmiJxfyhKuuNptNEg/rD02HRjuC5 GmZG8CEloGu8NGPu3CEEPrRpK2sqVf2F+KqM9MKjMr+++8DxwXy8eSOSDRI/yJyI /xQhUPPx7g+ZZuoXs5Fh6ckfuDIFwn3gT6tqmet59WcL5L1phr1grDyeP6NbrLLY UFEAbjs9x6TDnwbUM5DnDflBENhJElamSgClObp0UOa31FCI1okO8rW1qCL/HYhY z2avZB31qCwtCM/5nCg104+xKO3Bqz3QcCtkL4m7gRWmPvATpOUweI9ptYW69iwF 2Bmr+25h2yVLvfAhqVvCGnRqAdPoSBYoasZR94oF9ctjOu66uWdT7h12oiPlFEFh oZXfozGdb+HdX18/If/2vzPskuZ/EGwbOJn3IHSmuru2oIBHrIHZ5X3ke6gtHeIN Pby2IS10QpCng48r+278ifFkPyG0Y1XmalapBHPadpWy3htPQEr9YmGehEGiyKMz hgD8rss/D7HTS/o+FGE8sE9yjEWpCbUcPWu5u7Rw8chAut8GHVHAvCRgCcUK5puo rmse06Ba+bjUh3OucXsHmsk8VQ+STC4xt1cTbnDTd1xELrH8J+qv8fGV84sdEAaj K3wXCIrtY5U=osL7 -----END PGP SIGNATURE----- -- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

resource management error

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Juha-Matti Tilli

SOURCES

LAST UPDATE DATE

2026-07-15T22:14:48.143000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE