{"id":"CVE-2026-98872","title":"kernel: freevxfs: don't BUG() on unknown typed-extent type (CVE-2026-98872)","summary":"A flaw was found in the Linux kernel's FreeVxFS filesystem driver. When encountering an unrecognized extent type in an on-disk structure, the driver triggers a fatal kernel panic instead of handling the error cleanly. A local user can expl…","severity":"medium","cvss":4.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":"CWE-617","vendor":"Red Hat","product":"Red Hat Enterprise Linux 6","affected":["enterprise_linux 6"],"published":"2026-10-23","updated":"2026-10-26","sourceUpdated":"2026-10-26T11:01:44+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98872.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98872.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-98872"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2559565"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98872"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98872"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98872.mbox"},{"url":"https://git.kernel.org/stable/c/fe40a19d571cbb584eea46038ee919d8712b2d2c"},{"url":"https://git.kernel.org/stable/c/500e9d5bf9eff2096a21b7ac25a0a06ca46ab821"},{"url":"https://git.kernel.org/stable/c/f1f2d54a576f0e4133b979e545abcfefd439c300"},{"url":"https://git.kernel.org/stable/c/7ada9807e37103b41f586d34e3075e1209182b65"},{"url":"https://git.kernel.org/stable/c/1284d687d46953fff9c0d969df108114611aca8b"},{"url":"https://git.kernel.org/stable/c/405f13d7b270913e06e8e2b4de568985f94ef7d6"},{"url":"https://git.kernel.org/stable/c/704d48d81dc41470e108811c32c577ada66192d4"}],"tags":["csaf","vex","red-hat","cve.org"],"epss":0.00213,"epssPercentile":0.11523,"ingestedAt":"2026-10-23T13:24:55.584Z","slug":"CVE-2026-98872","body":"## Overview\n\nA flaw was found in the Linux kernel's FreeVxFS filesystem driver. When encountering an unrecognized extent type in an on-disk structure, the driver triggers a fatal kernel panic instead of handling the error cleanly. A local user can exploit this flaw by querying file block mappings on a specially crafted filesystem, resulting in a system crash and a Denial of Service (DoS).\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98872.json)\n\n**kernel: freevxfs: don't BUG() on unknown typed-extent type** — rated Moderate by Red Hat. Released 2026-10-23, updated 2026-10-26.\n\nAffected:\n\n- Red Hat Enterprise Linux 6\n\nNo fix planned:\n\n- Red Hat Enterprise Linux 6\n\nNot affected:\n\n- Red Hat Enterprise Linux 10\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat Enterprise Linux 9\n- Red Hat OpenShift Container Platform 4\n\n## Remediation\n\nOut of support scope","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":24.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":229318,"id":"CVE-2026-98872","ts":1793019683300,"field":"cvss","old":null,"new":"4.4"},{"seq":229317,"id":"CVE-2026-98872","ts":1793019683300,"field":"severity","old":"none","new":"medium"}]}