Advisories ยป MGASA-2021-0224

Updated kernel packages fix security vulnerabilities

Publication date: 31 May 2021
Type: security
Affected Mageia releases : 7 , 8
CVE: CVE-2021-3564 , CVE-2021-33200


This kernel update is based on upstream 5.10.41 and fixes at least the
following security issues:

A double-free memory corruption in the Linux kernel HCI device
initialization subsystem was found in the way user attach malicious HCI
TTY Bluetooth device. A local user could use this flaw to crash the system

kernel/bpf/verifier.c in the Linux kernel through 5.12.7 enforces incorrect
limits for pointer arithmetic operations. This can be abused to perform
out-of-bounds reads and writes in kernel memory, leading to local privilege
escalation to root. In particular, there is a corner case where the off reg
causes a masking direction change, which then results in an incorrect final
aux->alu_limit (CVE-2021-33200).

Other fixes in this update:
- proc: Check /proc/$pid/attr/ writes against file opener

For other upstream fixes, see the referenced changelogs.