[ CVE-2023-0266 · Published 30 Jan 2023 ]
Linux Kernel Use-After-Free Vulnerability
Exploited · CISA KEV CVSS 7.0
EPSS 4%Fix available
[ Why it matters ]Priority signals
- Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2023-03-30
[ Description ]Official 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
CISA: Linux kernel contains a use-after-free vulnerability that allows for privilege escalation to gain ring0 access from the system user.
[ Fixes ]Fixes and patches
CISA required action (US federal deadline 20 Apr 2023): Apply updates per vendor instructions.
- Patch on git.kernel.orgVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
- Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
- Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
[ References ]References
- git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/queue-5.10/alsa-pc…Mailing ListPatchVendor Advisory
- github.com/torvalds/linux/commit/56b88b50565cd8b946a2d00b0c83927b7ebb055ePatch
- github.com/torvalds/linux/commit/becf9e5d553c2389d857a3c178ce80fdb34a02e1Patch
- lists.debian.org/debian-lts-announce/2023/05/msg00006.htmlMailing ListThird Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource