CVE-2023-0266

Linux Kernel

Published 30 Jan 2023 · updated 17 Jun 2026 · Analyzed

7.0 High · CVSS 3.1, NVD

Exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on 30 Mar 2023, with a remediation deadline of 20 Apr 2023 for US federal agencies.

Required action: Apply updates per vendor instructions.

Description

A use after free vulnerability exists in the ALSA PCM package in the Linux Kernel. SNDRV_CTL_IOCTL_ELEM_{READ|WRITE}32 is missing locks that can be used in a use-after-free that can result in a priviledge escalation to gain ring0 access from the system user. We recommend upgrading past commit 56b88b50565cd8b946a2d00b0c83927b7ebb055e

References

git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/queue-5.10/alsa-pcm-move-rwsem-lock-inside-snd_ctl_elem_read-to-prevent-uaf.patch?id=72783cf35e6c55bca84c4bb7b776c58152856fd4 · Mailing List, Patch, Vendor Advisory
github.com/torvalds/linux/commit/56b88b50565cd8b946a2d00b0c83927b7ebb055e · Patch
github.com/torvalds/linux/commit/becf9e5d553c2389d857a3c178ce80fdb34a02e1 · Patch
lists.debian.org/debian-lts-announce/2023/05/msg00006.html · Mailing List, Third Party Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-0266 · US Government Resource