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Ubuntu 22.04 LTS USN-6533-1 Critical: Race Conditions in Kernel

ubuntu
Calendar Grey December 5, 2023
Dist Ubuntu Esm H88
Ubuntu 22.04 LTS has addressed multiple security flaws in its OEM Linux kernel. Ensure your system remains secure by keeping it updated.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-oem-6.1: Linux kernel for OEM systems

Details:

Tom Dohrmann discovered that the Secure Encrypted Virtualization (SEV)

implementation for AMD processors in the Linux kernel contained a race

condition when accessing MMIO registers. A local attacker in a SEV guest VM

could possibly use this to cause a denial of service (system crash) or

possibly execute arbitrary code. (CVE-2023-46813)

It was discovered that the io_uring subsystem in the Linux kernel contained

a race condition, leading to a null pointer dereference vulnerability. A

local attacker could use this to cause a denial of service (system crash).

(CVE-2023-46862)

Topics%20covered

Topics Covered

security advisory denial of service kernel update race condition ubuntu linux oem

Update Instructions

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

Ubuntu 22.04 LTS:
   linux-image-6.1.0-1027-oem      6.1.0-1027.27
   linux-image-oem-22.04           6.1.0.1027.28
   linux-image-oem-22.04a          6.1.0.1027.28
   linux-image-oem-22.04b          6.1.0.1027.28
   linux-image-oem-22.04c          6.1.0.1027.28

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-6533-1

CVE-2023-46813, CVE-2023-46862

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6533-1

Topics%20covered

Topics Covered

security advisory denial of service kernel update race condition ubuntu linux oem

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-6.1/6.1.0-1027.27

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