ID

VAR-202103-1029

CVE

CVE-2021-28038

TITLE

Xen PV  Used in  Linux Kernel   Vulnerability in resource allocation without restrictions or throttling in

DESCRIPTION

An issue was discovered in the Linux kernel through 5.11.3, as used with Xen PV. A certain part of the netback driver lacks necessary treatment of errors such as failed memory allocations (as a result of changes to the handling of grant mapping errors). A host OS denial of service may occur during misbehavior of a networking frontend driver. NOTE: this issue exists because of an incomplete fix for CVE-2021-26931. This update provides the corresponding Linux kernel updates targeted specifically for Raspberry Pi devices in those same Ubuntu Releases. ========================================================================== Ubuntu Security Notice USN-4984-1 June 04, 2021 linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.8, linux-kvm, linux-oracle vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.10 - Ubuntu 20.04 LTS Summary: Several security issues were fixed in the Linux kernel. An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash). (CVE-2021-28038) It was discovered that the Realtek RTL8188EU Wireless device driver in the Linux kernel did not properly validate ssid lengths in some situations. An attacker could use this to cause a denial of service (system crash). A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2021-28688) It was discovered that the fuse user space file system implementation in the Linux kernel did not properly handle bad inodes in some situations. A local attacker could possibly use this to cause a denial of service. (CVE-2021-28950) John Stultz discovered that the audio driver for Qualcomm SDM845 systems in the Linux kernel did not properly validate port ID numbers. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-28952) Zygo Blaxell discovered that the btrfs file system implementation in the Linux kernel contained a race condition during certain cloning operations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2021-28964) Vince Weaver discovered that the perf subsystem in the Linux kernel did not properly handle certain PEBS records properly for some Intel Haswell processors. A local attacker could use this to cause a denial of service (system crash). (CVE-2021-28971) It was discovered that the RPA PCI Hotplug driver implementation in the Linux kernel did not properly handle device name writes via sysfs, leading to a buffer overflow. A privileged attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-28972) It was discovered that the Qualcomm IPC router implementation in the Linux kernel did not properly initialize memory passed to user space. A local attacker could use this to expose sensitive information (kernel memory). A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2021-30002) Dan Carpenter discovered that the block device manager (dm) implementation in the Linux kernel contained a buffer overflow in the ioctl for listing devices. A privileged local attacker could use this to cause a denial of service (system crash). (CVE-2021-31916) It was discovered that the CIPSO implementation in the Linux kernel did not properly perform reference counting in some situations, leading to use- after-free vulnerabilities. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-33033) 马哲宇 discovered that the IEEE 1394 (Firewire) nosy packet sniffer driver 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) or possibly execute arbitrary code. (CVE-2021-3483) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.10: linux-image-5.8.0-1028-kvm 5.8.0-1028.30 linux-image-5.8.0-1031-oracle 5.8.0-1031.32 linux-image-5.8.0-1032-gcp 5.8.0-1032.34 linux-image-5.8.0-1033-azure 5.8.0-1033.35 linux-image-5.8.0-1035-aws 5.8.0-1035.37 linux-image-5.8.0-55-generic 5.8.0-55.62 linux-image-5.8.0-55-generic-64k 5.8.0-55.62 linux-image-5.8.0-55-generic-lpae 5.8.0-55.62 linux-image-5.8.0-55-lowlatency 5.8.0-55.62 linux-image-aws 5.8.0.1035.37 linux-image-azure 5.8.0.1033.33 linux-image-gcp 5.8.0.1032.32 linux-image-generic 5.8.0.55.60 linux-image-generic-64k 5.8.0.55.60 linux-image-generic-lpae 5.8.0.55.60 linux-image-gke 5.8.0.1032.32 linux-image-kvm 5.8.0.1028.30 linux-image-lowlatency 5.8.0.55.60 linux-image-oracle 5.8.0.1031.30 linux-image-virtual 5.8.0.55.60 Ubuntu 20.04 LTS: linux-image-5.8.0-55-generic 5.8.0-55.62~20.04.1 linux-image-5.8.0-55-generic-64k 5.8.0-55.62~20.04.1 linux-image-5.8.0-55-generic-lpae 5.8.0-55.62~20.04.1 linux-image-5.8.0-55-lowlatency 5.8.0-55.62~20.04.1 linux-image-generic-64k-hwe-20.04 5.8.0.55.62~20.04.39 linux-image-generic-hwe-20.04 5.8.0.55.62~20.04.39 linux-image-generic-lpae-hwe-20.04 5.8.0.55.62~20.04.39 linux-image-lowlatency-hwe-20.04 5.8.0.55.62~20.04.39 linux-image-virtual-hwe-20.04 5.8.0.55.62~20.04.39 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://ubuntu.com/security/notices/USN-4984-1 CVE-2021-28038, CVE-2021-28660, CVE-2021-28688, CVE-2021-28950, CVE-2021-28952, CVE-2021-28964, CVE-2021-28971, CVE-2021-28972, CVE-2021-29647, CVE-2021-30002, CVE-2021-31916, CVE-2021-33033, CVE-2021-3483 Package Information: https://launchpad.net/ubuntu/+source/linux/5.8.0-55.62 https://launchpad.net/ubuntu/+source/linux-aws/5.8.0-1035.37 https://launchpad.net/ubuntu/+source/linux-azure/5.8.0-1033.35 https://launchpad.net/ubuntu/+source/linux-gcp/5.8.0-1032.34 https://launchpad.net/ubuntu/+source/linux-kvm/5.8.0-1028.30 https://launchpad.net/ubuntu/+source/linux-oracle/5.8.0-1031.32 https://launchpad.net/ubuntu/+source/linux-hwe-5.8/5.8.0-55.62~20.04.1 . (CVE-2017-16644) It was discovered that the timer stats implementation in the Linux kernel allowed the discovery of a real PID value while inside a PID namespace. (CVE-2021-20261) Olivier Benjamin, Norbert Manthey, Martin Mazein, and Jan H

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

local

TYPE

other

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Ubuntu

SOURCES

LAST UPDATE DATE

2024-08-14T12:15:30.781000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE