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Ubuntu Security Notice USN-5217-1

Ubuntu Security Notice USN-5217-1
Posted Jan 11, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5217-1 - It was discovered that the NFS server implementation in the Linux kernel contained an out-of-bounds write vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that the eBPF implementation in the Linux kernel did not properly validate the memory size of certain ring buffer operation arguments. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-4090
MD5 | 58fe2ffaf82ea70ad565876f69d914a5

Ubuntu Security Notice USN-5217-1

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-5217-1
January 11, 2022

linux-oem-5.14 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-5.14: Linux kernel for OEM systems

Details:

It was discovered that the NFS server implementation in the Linux kernel
contained an out-of-bounds write vulnerability. A local attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2021-4090)

It was discovered that the eBPF implementation in the Linux kernel did
not properly validate the memory size of certain ring buffer operation
arguments. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (LP: #1956585)

Update instructions:

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

Ubuntu 20.04 LTS:
linux-image-5.14.0-1018-oem 5.14.0-1018.19
linux-image-oem-20.04d 5.14.0.1018.16

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-5217-1
CVE-2021-4090, https://launchpad.net/bugs/1956585

Package Information:
https://launchpad.net/ubuntu/+source/linux-oem-5.14/5.14.0-1018.19
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