{"id":"CVE-2026-49427","state":"PUBLISHED","title":"posixshm: largepage shared memory objects not explicitly wired","description":"Pages belonging to largepage shared memory objects were not explicitly wired.  When sendfile(2) transmitted such an object with the SF_NOCACHE flag, it freed the underlying pages after transmission even though existing mappings still referred to them.\n\nAn unprivileged local user can abuse the bug to access freed kernel memory.  This can be exploited to escalate privileges.","publishedAt":"2026-08-19T05:56:53.494Z","updatedAt":"2026-08-20T18:35:54.694Z","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":["posixshm"]}],"references":["https://security.freebsd.org/advisories/FreeBSD-SA-26:44.posixshm.asc"],"weaknesses":["CWE-826"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/49xxx/CVE-2026-49427.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-49427","state":"PUBLISHED","datePublished":"2026-08-19T05:56:53.494Z","dateUpdated":"2026-08-20T18:35:54.694Z","assignerShortName":"freebsd","assignerOrgId":"63664ac6-956c-4cba-a5d0-f46076e16109","dateReserved":"2026-05-29T20:24:28.616Z"},"containers":{"cna":{"title":"posixshm: largepage shared memory objects not explicitly wired","descriptions":[{"lang":"en","value":"Pages belonging to largepage shared memory objects were not explicitly wired.  When sendfile(2) transmitted such an object with the SF_NOCACHE flag, it freed the underlying pages after transmission even though existing mappings still referred to them.\n\nAn unprivileged local user can abuse the bug to access freed kernel memory.  This can be exploited 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":["posixshm"]}],"references":[{"url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:44.posixshm.asc","tags":["vendor-advisory"]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-826","description":"CWE-826: Premature Release of Resource During Expected Lifetime","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"freebsd","orgId":"63664ac6-956c-4cba-a5d0-f46076e16109","dateUpdated":"2026-08-19T05:56:53.494Z"},"datePublic":"2026-06-30T20:00:00.000Z","credits":[{"lang":"en","type":"finder","value":"Chris Jarrett-Davies of the OpenAI Codex Security Team"}],"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":"2026-08-20T03:56:01.222360Z","id":"CVE-2026-49427","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":"2026-08-20T18:35:54.694Z"}}]}}}