{"schema":"threatline.record/2","record":{"id":"CVE-2026-93813","aliases":[],"summary":"btrfs: tree-checker: validate INODE_REF's namelen","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: tree-checker: validate INODE_REF's namelen\n\n[BUG]\nA crafted btrfs image can trigger the following crash:\n\n  BUG: unable to handle page fault for address: ffffd1dc42884000\n  #PF: supervisor write access in kernel mode\n  #PF: error_code(0x0002) - not-present page\n  CPU: 9 UID: 0 PID: 1034 Comm: poc Not tainted 7.1.0-rc4-custom+ #383 PREEMPT(full)  46af0a92938a63be7132e0dfd71e62327c51d5c2\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022\n  RIP: 0010:memcpy+0xc/0x10\n  Call Trace:\n   <TASK>\n   read_extent_buffer+0xe4/0x100 [btrfs 3cf0785dd58fec8c5ff84633b772f17ce1f92a8f]\n   btrfs_get_name+0x15e/0x1e0 [btrfs 3cf0785dd58fec8c5ff84633b772f17ce1f92a8f]\n   reconnect_path+0x165/0x390\n   exportfs_decode_fh_raw+0x337/0x400\n   ? drop_caches_sysctl_handler+0xb0/0xb0\n   </TASK>\n  ---[ end trace 0000000000000000 ]---\n  RIP: 0010:memcpy+0xc/0x10\n  Kernel panic - not syncing: Fatal exception\n\n[CAUSE]\nTThe crafted image has the following corrupted INODE_REF item:\n\n         item 9 key (258 INODE_REF 257) itemoff 11544 itemsize 4106\n         \tindex 2 namelen 4096 name: d\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\\000\n\nThe itemsize matches the namelen, but the namelen is 4096, way larger\nthan normal name length limit (BTRFS_NAME_LEN, 255).\n\nMeanwhile the memory of the @name is only 255 byte sized, this will cause\nout-of-boundary access, and cause the above crash.\n\n[FIX]\nAdd extra namelen verification for INODE_REF, just like what we have\ndone in ROOT_REF checks.\n\nNow the crafted image can be rejected gracefully:\n\n BTRFS critical (device dm-2): corrupt leaf: root=5 block=30572544 slot=14 ino=259, invalid inode ref name length, has 4096 expect [1, 255]\n BTRFS error (device dm-2): read time tree block corruption detected on logical 30572544 mirror 2\n\n[ Rebase, add a Link: tag, add an simple cause analyze ]","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93813","source_modified_at":"2026-10-03T10:57:45.809Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"Linux","vendor":"Linux","versions":[{"version":"2ede0daf01549cecf4bb0962c46dc47382047523","lessThan":"60078a3e25c09d9d8fba828b0d81bb33e449a1b2","status":"affected","versionType":"git"},{"version":"2ede0daf01549cecf4bb0962c46dc47382047523","lessThan":"509d6a4d889e425f305461d8323a7b39ca6c121c","status":"affected","versionType":"git"},{"version":"2ede0daf01549cecf4bb0962c46dc47382047523","lessThan":"4cb41f07685f88ec724a375883bb0c731db8f6eb","status":"affected","versionType":"git"},{"version":"2ede0daf01549cecf4bb0962c46dc47382047523","lessThan":"eeddee090b834a7d4b6a8214d2e3739e64c7a338","status":"affected","versionType":"git"},{"version":"2ede0daf01549cecf4bb0962c46dc47382047523","lessThan":"8f75c19892263bc0555fba922aefe103e841e86d","status":"affected","versionType":"git"},{"version":"2ede0daf01549cecf4bb0962c46dc47382047523","lessThan":"3dc22abc21f5892406c09202fa2627196cc96967","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93813","source_modified_at":"2026-10-03T10:57:45.809Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"Linux","vendor":"Linux","versions":[{"version":"2.6.37","status":"affected"},{"version":"0","lessThan":"2.6.37","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93813","source_modified_at":"2026-10-03T10:57:45.809Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"Linux","ecosystem":null},"version":"60078a3e25c09d9d8fba828b0d81bb33e449a1b2","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93813","source_modified_at":"2026-10-03T10:57:45.809Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"Linux","ecosystem":null},"version":"509d6a4d889e425f305461d8323a7b39ca6c121c","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93813","source_modified_at":"2026-10-03T10:57:45.809Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"Linux","ecosystem":null},"version":"4cb41f07685f88ec724a375883bb0c731db8f6eb","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93813","source_modified_at":"2026-10-03T10:57:45.809Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"Linux","ecosystem":null},"version":"8f75c19892263bc0555fba922aefe103e841e86d","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93813","source_modified_at":"2026-10-03T10:57:45.809Z","fetched_at":"2026-10-23T18:52:38.922436Z","package":{"name":"Linux","ecosystem":null},"version":"3dc22abc21f5892406c09202fa2627196cc96967","basis":"first unaffected version stated in the CVE record"}],"cvss":7.8,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00129,"percentile":0.02313,"score_date":"2026-10-23"},"published_at":"2026-09-24T16:02:49.907Z","modified_at":"2026-10-03T10:57:45.809Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-93813","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-10-03T10:57:45.809Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-93813","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/60078a3e25c09d9d8fba828b0d81bb33e449a1b2"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/509d6a4d889e425f305461d8323a7b39ca6c121c"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/4cb41f07685f88ec724a375883bb0c731db8f6eb"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/eeddee090b834a7d4b6a8214d2e3739e64c7a338"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/8f75c19892263bc0555fba922aefe103e841e86d"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/3dc22abc21f5892406c09202fa2627196cc96967"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-03T10:57:45.809Z","content_hash":"3415e0d9b757c5cb125ef37c8c2dce04152b518ce0704a8f3e6f36cb02bec319"}}