{"api_version":"1","generated_at":"2026-08-19T11:44:42+00:00","cve":"CVE-2026-49427","urls":{"html":"https://cve.report/CVE-2026-49427","api":"https://cve.report/api/cve/CVE-2026-49427.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-49427","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-49427"},"summary":{"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.","state":"PUBLISHED","assigner":"freebsd","published_at":"2026-08-19 06:17:41","updated_at":"2026-08-19 06:17:41"},"problem_types":["CWE-826","CWE-826 CWE-826: Premature Release of Resource During Expected Lifetime"],"metrics":[],"references":[{"url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:44.posixshm.asc","name":"https://security.freebsd.org/advisories/FreeBSD-SA-26:44.posixshm.asc","refsource":"secteam@freebsd.org","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-49427","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49427","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"FreeBSD","product":"FreeBSD","version":"affected 15.1-RELEASE p1 release","platforms":[]},{"source":"CNA","vendor":"FreeBSD","product":"FreeBSD","version":"affected 15.0-RELEASE p11 release","platforms":[]},{"source":"CNA","vendor":"FreeBSD","product":"FreeBSD","version":"affected 14.4-RELEASE p7 release","platforms":[]},{"source":"CNA","vendor":"FreeBSD","product":"FreeBSD","version":"affected 14.3-RELEASE p16 release","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"Chris Jarrett-Davies of the OpenAI Codex Security Team","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unknown","modules":["posixshm"],"product":"FreeBSD","vendor":"FreeBSD","versions":[{"lessThan":"p1","status":"affected","version":"15.1-RELEASE","versionType":"release"},{"lessThan":"p11","status":"affected","version":"15.0-RELEASE","versionType":"release"},{"lessThan":"p7","status":"affected","version":"14.4-RELEASE","versionType":"release"},{"lessThan":"p16","status":"affected","version":"14.3-RELEASE","versionType":"release"}]}],"credits":[{"lang":"en","type":"finder","value":"Chris Jarrett-Davies of the OpenAI Codex Security Team"}],"datePublic":"2026-06-30T20:00:00.000Z","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."}],"problemTypes":[{"descriptions":[{"cweId":"CWE-826","description":"CWE-826: Premature Release of Resource During Expected Lifetime","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-19T05:56:53.494Z","orgId":"63664ac6-956c-4cba-a5d0-f46076e16109","shortName":"freebsd"},"references":[{"tags":["vendor-advisory"],"url":"https://security.freebsd.org/advisories/FreeBSD-SA-26:44.posixshm.asc"}],"title":"posixshm: largepage shared memory objects not explicitly wired","x_generator":{"engine":"cvelib 1.8.0"}}},"cveMetadata":{"assignerOrgId":"63664ac6-956c-4cba-a5d0-f46076e16109","assignerShortName":"freebsd","cveId":"CVE-2026-49427","datePublished":"2026-08-19T05:56:53.494Z","dateReserved":"2026-05-29T20:24:28.616Z","dateUpdated":"2026-08-19T05:56:53.494Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-19 06:17:41","lastModifiedDate":"2026-08-19 06:17:41","problem_types":["CWE-826","CWE-826 CWE-826: Premature Release of Resource During Expected Lifetime"],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"49427","Ordinal":"1","Title":"posixshm: largepage shared memory objects not explicitly wired","CVE":"CVE-2026-49427","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"49427","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"posixshm: largepage shared memory objects not explicitly wired"}]}}}