[USN-6205-1] Linux kernel (GKE) vulnerabilities
Rodrigo Figueiredo Zaiden
rodrigo.zaiden at canonical.com
Thu Jul 6 19:12:21 UTC 2023
Ubuntu Security Notice USN-6205-1
July 06, 2023
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
Several security issues were fixed in the Linux kernel.
- linux-gke: Linux kernel for Google Container Engine (GKE) systems
Hangyu Hua discovered that the Flower classifier implementation in the
Linux kernel contained an out-of-bounds write vulnerability. An attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2023-35788, LP: #2023577)
It was discovered that for some Intel processors the INVLPG instruction
implementation did not properly flush global TLB entries when PCIDs are
enabled. An attacker could use this to expose sensitive information
(kernel memory) or possibly cause undesired behaviors. (LP: #2023220)
The problem can be corrected by updating your system to the following
Ubuntu 20.04 LTS:
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.
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