{"id":"CVE-2026-98872","title":"freevxfs: don't BUG() on unknown typed-extent type","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nfreevxfs: don't BUG() on unknown typed-extent type\n\nvxfs_bmap_typed() handles four typed-extent types and calls BUG() in\nits default case, so an on-disk typed extent wi…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fe40a19d571cbb584eea46038ee919d8712b2d2c","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 500e9d5bf9eff2096a21b7ac25a0a06ca46ab821","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f1f2d54a576f0e4133b979e545abcfefd439c300","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7ada9807e37103b41f586d34e3075e1209182b65","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1284d687d46953fff9c0d969df108114611aca8b","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 405f13d7b270913e06e8e2b4de568985f94ef7d6","Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 704d48d81dc41470e108811c32c577ada66192d4","Linux < 5.10.271","Linux < 5.15.222","Linux < 6.1.189","Linux < 6.6.158","Linux < 6.12.111","Linux < 6.18.53","Linux (all versions)"],"published":"2026-10-23","updated":"2026-10-23","sourceUpdated":"2026-10-23T11:37:11.214Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98872","references":[{"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":["cve.org"],"ingestedAt":"2026-10-23T13:24:55.584Z","slug":"CVE-2026-98872","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nfreevxfs: don't BUG() on unknown typed-extent type\n\nvxfs_bmap_typed() handles four typed-extent types and calls BUG() in\nits default case, so an on-disk typed extent with any other type value\ncrashes the kernel. It is reachable from ioctl(FIBMAP) on a regular\nfile:\n\n  kernel BUG at fs/freevxfs/vxfs_bmap.c:230!\n  RIP: vxfs_bmap_typed fs/freevxfs/vxfs_bmap.c:230 [inline]\n       vxfs_bmap1+0x128a/0x12d0 fs/freevxfs/vxfs_bmap.c:257\n\nReplace the BUG() with WARN_ON_ONCE() and return 0 -- the value\nvxfs_bmap_typed() already returns on failure (and from the DEV4 case\nabove); vxfs_getblk() maps 0 to -EIO, so the ioctl fails cleanly.\n\n## Affected\n\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fe40a19d571cbb584eea46038ee919d8712b2d2c`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 500e9d5bf9eff2096a21b7ac25a0a06ca46ab821`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f1f2d54a576f0e4133b979e545abcfefd439c300`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 7ada9807e37103b41f586d34e3075e1209182b65`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1284d687d46953fff9c0d969df108114611aca8b`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 405f13d7b270913e06e8e2b4de568985f94ef7d6`\n- `Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 704d48d81dc41470e108811c32c577ada66192d4`\n- `Linux < 5.10.271`\n- `Linux < 5.15.222`\n- `Linux < 6.1.189`\n- `Linux < 6.6.158`\n- `Linux < 6.12.111`\n- `Linux < 6.18.53`\n- `Linux (all versions)`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}