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USN-5140-1: Linux kernel (OEM 5.14) vulnerabilities

11 November 2021

Several security issues were fixed in the Linux kernel.




It was discovered that the AMD Cryptographic Coprocessor (CCP) driver in
the Linux kernel did not properly deallocate memory in some error
conditions. A local attacker could use this to cause a denial of service
(memory exhaustion). (CVE-2021-3744, CVE-2021-3764)

It was discovered that an integer overflow could be triggered in the eBPF
implementation in the Linux kernel when preallocating objects for stack
maps. A privileged local attacker could use this to cause a denial of
service or possibly execute arbitrary code. (CVE-2021-41864)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 20.04

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.

Related notices

  • USN-5139-1: linux-headers-oem-20.04, linux-headers-oem-20.04-edge, linux-headers-5.10.0-1051-oem, linux-oem-20.04, linux-oem-20.04b, linux-tools-oem-20.04, linux-tools-5.10.0-1051-oem, linux-image-unsigned-5.10.0-1051-oem, linux-oem-20.04-edge, linux-buildinfo-5.10.0-1051-oem, linux-image-oem-20.04b, linux-oem-5.10-headers-5.10.0-1051, linux-modules-5.10.0-1051-oem, linux-headers-oem-20.04b, linux-tools-oem-20.04b, linux-image-oem-20.04-edge, linux-image-5.10.0-1051-oem, linux-oem-5.10, linux-oem-5.10-tools-5.10.0-1051, linux-tools-oem-20.04-edge, linux-image-oem-20.04, linux-oem-5.10-tools-host