{"id":"CVE-2026-80644","title":"ocfs2: don't BUG_ON an invalid journal dinode","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: don't BUG_ON an invalid journal dinode\n\n[BUG]\nA fuzzed OCFS2 image can corrupt the current slot journal dinode while\nmount is still in progress. The mount path f…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 10995aa2451afa20b721cc7de856cae1a13dba57 < bf1d59cf2ac8a1730607ebaa0bc0dc6d00f197d0","Linux >= 10995aa2451afa20b721cc7de856cae1a13dba57 < 86509c5296fe46ad6bcdd83931a53c2c6b7913a8","Linux >= 10995aa2451afa20b721cc7de856cae1a13dba57 < 12c32a7350b670aaaaf2e01583d8648ec0c9755c","Linux >= 10995aa2451afa20b721cc7de856cae1a13dba57 < b460f8d01a12061853d02c8fb693fb42450acd7d","Linux >= 10995aa2451afa20b721cc7de856cae1a13dba57 < a06eec15596e5801bad59ad16cd2bf4f0fa839a1","Linux >= 10995aa2451afa20b721cc7de856cae1a13dba57 < 3852478d34c7baa490ba9c7374ee901a56eea577","Linux >= 10995aa2451afa20b721cc7de856cae1a13dba57 < 5b33f99f3e48465bd93219495381a5aef4fa967f","Linux >= 10995aa2451afa20b721cc7de856cae1a13dba57 < c0438198c28b1d22c272751af5e717c11d9fa8dd","Linux 2.6.29"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T17:02:21.588154Z"},"published":"2026-08-28","updated":"2026-11-06","sourceUpdated":"2026-11-06T17:05:52.371Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80644","references":[{"url":"https://git.kernel.org/stable/c/bf1d59cf2ac8a1730607ebaa0bc0dc6d00f197d0"},{"url":"https://git.kernel.org/stable/c/86509c5296fe46ad6bcdd83931a53c2c6b7913a8"},{"url":"https://git.kernel.org/stable/c/12c32a7350b670aaaaf2e01583d8648ec0c9755c"},{"url":"https://git.kernel.org/stable/c/b460f8d01a12061853d02c8fb693fb42450acd7d"},{"url":"https://git.kernel.org/stable/c/a06eec15596e5801bad59ad16cd2bf4f0fa839a1"},{"url":"https://git.kernel.org/stable/c/3852478d34c7baa490ba9c7374ee901a56eea577"},{"url":"https://git.kernel.org/stable/c/5b33f99f3e48465bd93219495381a5aef4fa967f"},{"url":"https://git.kernel.org/stable/c/c0438198c28b1d22c272751af5e717c11d9fa8dd"}],"tags":["cve.org"],"epss":0.0022,"epssPercentile":0.12543,"ingestedAt":"2026-11-06T18:00:12.537Z","slug":"CVE-2026-80644","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: don't BUG_ON an invalid journal dinode\n\n[BUG]\nA fuzzed OCFS2 image can corrupt the current slot journal dinode while\nmount is still in progress. The mount path first reports the invalid\njournal block and then crashes in shutdown:\n\nkernel BUG at fs/ocfs2/journal.c:1034!\nOops: invalid opcode: 0000 [#1] SMP KASAN NOPTI\nRIP: 0010:ocfs2_journal_toggle_dirty+0x2d6/0x340 fs/ocfs2/journal.c:1034\nCall Trace:\n ocfs2_journal_shutdown+0x414/0xc30 fs/ocfs2/journal.c:1116\n ocfs2_mount_volume fs/ocfs2/super.c:1785 [inline]\n ocfs2_fill_super+0x30a9/0x3cd0 fs/ocfs2/super.c:1083\n get_tree_bdev_flags+0x38b/0x640 fs/super.c:1698\n get_tree_bdev+0x24/0x40 fs/super.c:1721\n ocfs2_get_tree+0x21/0x30 fs/ocfs2/super.c:1184\n vfs_get_tree+0x9a/0x370 fs/super.c:1758\n fc_mount fs/namespace.c:1199 [inline]\n do_new_mount_fc fs/namespace.c:3642 [inline]\n do_new_mount fs/namespace.c:3718 [inline]\n path_mount+0x5b8/0x1ea0 fs/namespace.c:4028\n do_mount fs/namespace.c:4041 [inline]\n __do_sys_mount fs/namespace.c:4229 [inline]\n __se_sys_mount fs/namespace.c:4206 [inline]\n __x64_sys_mount+0x282/0x320 fs/namespace.c:4206\n ...\n\n[CAUSE]\nocfs2_journal_toggle_dirty() used to return -EIO when journal->j_bh no\nlonger contained a valid dinode, because the startup and shutdown paths\nalready handled that failure. Commit 10995aa2451a\n(\"ocfs2: Morph the haphazard OCFS2_IS_VALID_DINODE() checks.\") changed\nthe check to a BUG_ON() under the assumption that the journal dinode had\nalready been validated. That turns an unexpected invalid journal dinode\nduring mount teardown into a kernel crash instead of a normal mount\nfailure.\n\n[FIX]\nReplace the BUG_ON() with WARN_ON() and return -EIO. This keeps the\ninvariant warning for debugging, but restores the original behavior of\nfailing startup or shutdown cleanly instead of panicking the kernel.\n\n## Affected\n\n- `Linux >= 10995aa2451afa20b721cc7de856cae1a13dba57 < bf1d59cf2ac8a1730607ebaa0bc0dc6d00f197d0`\n- `Linux >= 10995aa2451afa20b721cc7de856cae1a13dba57 < 86509c5296fe46ad6bcdd83931a53c2c6b7913a8`\n- `Linux >= 10995aa2451afa20b721cc7de856cae1a13dba57 < 12c32a7350b670aaaaf2e01583d8648ec0c9755c`\n- `Linux >= 10995aa2451afa20b721cc7de856cae1a13dba57 < b460f8d01a12061853d02c8fb693fb42450acd7d`\n- `Linux >= 10995aa2451afa20b721cc7de856cae1a13dba57 < a06eec15596e5801bad59ad16cd2bf4f0fa839a1`\n- `Linux >= 10995aa2451afa20b721cc7de856cae1a13dba57 < 3852478d34c7baa490ba9c7374ee901a56eea577`\n- `Linux >= 10995aa2451afa20b721cc7de856cae1a13dba57 < 5b33f99f3e48465bd93219495381a5aef4fa967f`\n- `Linux >= 10995aa2451afa20b721cc7de856cae1a13dba57 < c0438198c28b1d22c272751af5e717c11d9fa8dd`\n- `Linux 2.6.29`\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":[]}