MGASA-2021-0224 - Updated kernel packages fix security vulnerabilities

Publication date: 31 May 2021
URL: https://advisories.mageia.org/MGASA-2021-0224.html
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 atleast 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
(CVE-2021-3564).

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.

References:
- https://bugs.mageia.org/show_bug.cgi?id=28980
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.38
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.39
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.40
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.41
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3564
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33200

SRPMS:
- 7/core/kernel-5.10.41-1.mga7
- 7/core/kmod-virtualbox-6.1.22-1.5.mga7
- 7/core/kmod-xtables-addons-3.13-27.mga7
- 8/core/kernel-5.10.41-1.mga8
- 8/core/kmod-virtualbox-6.1.22-1.5.mga8
- 8/core/kmod-xtables-addons-3.18-1.5.mga8