{"id":"CVE-2023-0266","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-0266","generatedAt":"2026-10-31T11:45:39.453Z","title":"Linux Kernel Use-After-Free Vulnerability","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","published":"2023-01-30T14:15:11.000Z","lastModified":"2026-06-17T05:25:10.000Z","status":"Analyzed","sourceIdentifier":"cve-coordination@google.com","cvss":{"version":"3.1","score":7,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-416"],"affected":["debian/debian linux","linux/linux kernel"],"epss":{"score":0.03702,"percentile":0.89725,"date":"2026-10-30","history":[]},"kev":{"listed":true,"dateAdded":"2023-03-30","dueDate":"2023-04-20","knownRansomwareCampaignUse":"Unknown","notes":"Apply updates per vendor instructions.\nhttps://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;  https://nvd.nist.gov/vuln/detail/CVE-2023-0266"},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 20 April 2023). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[],"references":[{"url":"https://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","tags":["Mailing List","Patch","Vendor Advisory"],"source":"cve-coordination@google.com"},{"url":"https://github.com/torvalds/linux/commit/56b88b50565cd8b946a2d00b0c83927b7ebb055e","tags":["Patch"],"source":"cve-coordination@google.com"},{"url":"https://github.com/torvalds/linux/commit/becf9e5d553c2389d857a3c178ce80fdb34a02e1","tags":["Patch"],"source":"cve-coordination@google.com"},{"url":"https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html","tags":["Mailing List","Third Party Advisory"],"source":"cve-coordination@google.com"},{"url":"https://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","tags":["Mailing List","Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/torvalds/linux/commit/56b88b50565cd8b946a2d00b0c83927b7ebb055e","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/torvalds/linux/commit/becf9e5d553c2389d857a3c178ce80fdb34a02e1","tags":["Patch"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-0266","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-0266","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}