{"id":"CVE-2026-49418","state":"PUBLISHED","title":"Use-after-free in device pager page list","description":"When msync(MS_INVALIDATE) is called on a mapping of an unmanaged device object, the physical pages in the mapping range are marked invalid but remain in the pager's page list.  A subsequent page fault will cause the fault handler to re-insert the page into the object's list.  This corrupts the list, and on object destruction the page is freed twice.\n\nAn unprivileged local user with access to a device that provides memory-mapped I/O can trigger a use-after-free in the kernel, though this is limited to a pool of objects (\"fictitious pages\") that are never recycled for a different purpose.  It may be possible to exploit this to escalate privileges.","publishedAt":"2026-08-19T04:14:17.429Z","updatedAt":"2026-08-20T18:34:37.191Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/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":"p1","versionType":"release"},{"version":"15.0-RELEASE","status":"affected","lessThan":"p11","versionType":"release"},{"version":"14.4-RELEASE","status":"affected","lessThan":"p7","versionType":"release"},{"version":"14.3-RELEASE","status":"affected","lessThan":"p16","versionType":"release"}],"modules":["vm"]}],"references":["https://security.freebsd.org/advisories/FreeBSD-SA-26:37.vm.asc"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/49xxx/CVE-2026-49418.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-49418","state":"PUBLISHED","datePublished":"2026-08-19T04:14:17.429Z","dateUpdated":"2026-08-20T18:34:37.191Z","assignerShortName":"freebsd","assignerOrgId":"63664ac6-956c-4cba-a5d0-f46076e16109","dateReserved":"2026-05-29T20:24:28.615Z"},"containers":{"cna":{"title":"Use-after-free in device pager page list","descriptions":[{"lang":"en","value":"When msync(MS_INVALIDATE) is called on a mapping of an unmanaged device object, the physical pages in the mapping range are marked invalid but remain in the pager's page list.  A subsequent page fault will cause the fault handler to re-insert the page into the object's list.  This corrupts the list, and on object destruction the page is freed twice.\n\nAn unprivileged local user with access to a device that provides memory-mapped I/O can trigger a use-after-free in the kernel, though this is limited to a pool of objects (\"fictitious pages\") that are never recycled for a different purpose.  It may be possible to exploit this to escalate privileges."}],"affected":[{"vendor":"FreeBSD","product":"FreeBSD","defaultStatus":"unknown","versions":[{"version":"15.1-RELEASE","status":"affected","lessThan":"p1","versionType":"release"},{"version":"15.0-RELEASE","status":"affected","lessThan":"p11","versionType":"release"},{"version":"14.4-RELEASE","status":"affected","lessThan":"p7","versionType":"release"},{"version":"14.3-RELEASE","status":"affected","lessThan":"p16","versionType":"release"}],"modules":["vm"]}],"references":[{"url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:37.vm.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":"2026-08-19T04:14:17.429Z"},"datePublic":"2026-06-30T20:00:00.000Z","credits":[{"lang":"en","type":"finder","value":"slidybat"}],"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":8.8,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/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":"2026-08-20T03:56:05.175712Z","id":"CVE-2026-49418","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-20T18:34:37.191Z"}}]}}}