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Ubuntu 22.04 LTS USN-6070-1 High Severity Kernel Privilege Escalation

ubuntu
Calendar Grey May 10, 2023
Dist Ubuntu Esm H88
Several vulnerabilities in the Ubuntu kernel have been patched; ensure your system is updated to keep it secure.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-raspi: Linux kernel for Raspberry Pi systems

- linux-azure-fde-5.15: Linux kernel for Microsoft Azure CVM cloud systems

Details:

It was discovered that the Traffic-Control Index (TCINDEX) implementation

in the Linux kernel did not properly perform filter deactivation in some

situations. A local attacker could possibly use this to gain elevated

privileges. Please note that with the fix for this CVE, kernel support for

the TCINDEX classifier has been removed. (CVE-2023-1829)

It was discovered that a race condition existed in the io_uring subsystem

in the Linux kernel, 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-2023-1872)

Topics%20covered

Topics Covered

security advisory denial of service high severity privilege escalation Ubuntu kernel

Update Instructions

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

Ubuntu 22.04 LTS:
   linux-image-5.15.0-1028-raspi   5.15.0-1028.30
   linux-image-5.15.0-1028-raspi-nolpae  5.15.0-1028.30
   linux-image-raspi               5.15.0.1028.25
   linux-image-raspi-nolpae        5.15.0.1028.25

Ubuntu 20.04 LTS:
   linux-image-5.15.0-1037-azure-fde  5.15.0-1037.44~20.04.1.1
   linux-image-azure-fde           5.15.0.1037.44~20.04.1.16

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-6070-1

CVE-2023-1829, CVE-2023-1872

May 10, 2023

Topics%20covered

Topics Covered

security advisory denial of service high severity privilege escalation Ubuntu kernel

Package Information

https://launchpad.net/ubuntu/+source/linux-raspi/5.15.0-1028.30
https://launchpad.net/ubuntu/+source/linux-azure-fde-5.15/5.15.0-1037.44~20.04.1.1

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