CVE-2023-0266
KEVLinux Kernel Use-After-Free Vulnerability
Description
Linux kernel contains a use-after-free vulnerability that allows for privilege escalation to gain ring0 access from the system user.
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
CVSS 3.1 vector
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:HPublishedJan 30, 2023
Last modifiedJun 17, 2026
Added to KEVMar 30, 2023
Remediation dueApr 20, 2023
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=72783cf35e6c55bca84c4bb7b776c58152856fd4Mailing ListPatch
- 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
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-0266US Government Resource
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Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 1285 days
- CVSS
- 7.9 HIGH
- EPSS (30-day exploit probability)
- 3.7% · top 10% of all CVEs
- Weakness
- CWE-416
Recommended actions
- 1.Apply updates per vendor instructions.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.