{"id":"CVE-2026-58091","state":"PUBLISHED","title":"Kernel use-after-free via the SNDCTL_DSP_SYNCSTART ioctl","description":"The implementation of this ioctl attempts to acquire locks on all channels in a sync group.  If locking a channel would block, it releases the sync group list lock and sleeps.  Upon reawakening, it is possible that the sync group structure is freed, but the implementation did not handle this possibility.\n\n On a system with a multiple audio devices, an unprivileged local user can exploit this use-after-free to escalate privileges.","publishedAt":"2026-08-26T04:38:19.487Z","updatedAt":"2026-08-27T03:57:06.764Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"freebsd","products":["FreeBSD FreeBSD"],"affected":[{"vendor":"FreeBSD","product":"FreeBSD","defaultStatus":"unknown","versions":[{"version":"15.1-RELEASE","status":"affected","lessThan":"p3","versionType":"release"},{"version":"15.0-RELEASE","status":"affected","lessThan":"p13","versionType":"release"},{"version":"14.4-RELEASE","status":"affected","lessThan":"p9","versionType":"release"}],"modules":["sound"]}],"references":["https://security.freebsd.org/advisories/FreeBSD-SA-26:58.sound.asc"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/58xxx/CVE-2026-58091.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-58091","state":"PUBLISHED","datePublished":"2026-08-26T04:38:19.487Z","dateUpdated":"2026-08-27T03:57:06.764Z","assignerShortName":"freebsd","assignerOrgId":"63664ac6-956c-4cba-a5d0-f46076e16109","dateReserved":"2026-06-29T01:40:17.498Z"},"containers":{"cna":{"title":"Kernel use-after-free via the SNDCTL_DSP_SYNCSTART ioctl","descriptions":[{"lang":"en","value":"The implementation of this ioctl attempts to acquire locks on all channels in a sync group.  If locking a channel would block, it releases the sync group list lock and sleeps.  Upon reawakening, it is possible that the sync group structure is freed, but the implementation did not handle this possibility.\n\n On a system with a multiple audio devices, an unprivileged local user can exploit this use-after-free to escalate privileges."}],"affected":[{"vendor":"FreeBSD","product":"FreeBSD","defaultStatus":"unknown","versions":[{"version":"15.1-RELEASE","status":"affected","lessThan":"p3","versionType":"release"},{"version":"15.0-RELEASE","status":"affected","lessThan":"p13","versionType":"release"},{"version":"14.4-RELEASE","status":"affected","lessThan":"p9","versionType":"release"}],"modules":["sound"]}],"references":[{"url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:58.sound.asc","tags":["vendor-advisory"]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-416","description":"CWE-416: Use After Free","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"freebsd","orgId":"63664ac6-956c-4cba-a5d0-f46076e16109","dateUpdated":"2026-08-26T04:38:19.487Z"},"datePublic":"2026-08-25T19:45:00.000Z","credits":[{"lang":"en","type":"finder","value":"Hazley Samsudin of GovTech CSG"}],"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.8,"attackVector":"LOCAL","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-08-26T00:00:00+00:00","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3","id":"CVE-2026-58091"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-27T03:57:06.764Z"}}]}}}