CVE-2023-0266
High 7.0 Exploited in the wild (KEV)
Confirmed active exploitation — CISA KEV catalog
- Name
- Linux Kernel Use-After-Free Vulnerability
- Added to catalog
- Remediation due date (US federal)
- 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
Metrics
- CVSS 3.1
-
7.0 (HIGH)
Score source: NVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 4% (percentile: 90) as of 2 November 2026
- CWE
- CWE-416
Affected products
debian: debian linux; linux: linux kernel
References
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/qu… Mailing ListPatchVendor Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/qu… Mailing ListPatchVendor Advisory
- https://github.com/torvalds/linux/commit/56b88b50565cd8b946a2d00b0c83927b7ebb05… Patch
- https://github.com/torvalds/linux/commit/becf9e5d553c2389d857a3c178ce80fdb34a02… Patch
- https://github.com/torvalds/linux/commit/56b88b50565cd8b946a2d00b0c83927b7ebb05… Patch
- https://github.com/torvalds/linux/commit/becf9e5d553c2389d857a3c178ce80fdb34a02… Patch
- https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html Mailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html Mailing ListThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023… US Government Resource