{"id":"CVE-2026-80644","summary":"ocfs2: don't BUG_ON an invalid journal dinode","details":"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 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-\u003ej_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.","modified":"2026-08-30T03:47:21.767058755Z","published":"2026-08-28T06:48:55.076Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80644.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/12c32a7350b670aaaaf2e01583d8648ec0c9755c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3852478d34c7baa490ba9c7374ee901a56eea577"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5b33f99f3e48465bd93219495381a5aef4fa967f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/86509c5296fe46ad6bcdd83931a53c2c6b7913a8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a06eec15596e5801bad59ad16cd2bf4f0fa839a1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b460f8d01a12061853d02c8fb693fb42450acd7d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bf1d59cf2ac8a1730607ebaa0bc0dc6d00f197d0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c0438198c28b1d22c272751af5e717c11d9fa8dd"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80644.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80644"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"10995aa2451afa20b721cc7de856cae1a13dba57"},{"fixed":"bf1d59cf2ac8a1730607ebaa0bc0dc6d00f197d0"},{"fixed":"86509c5296fe46ad6bcdd83931a53c2c6b7913a8"},{"fixed":"12c32a7350b670aaaaf2e01583d8648ec0c9755c"},{"fixed":"b460f8d01a12061853d02c8fb693fb42450acd7d"},{"fixed":"a06eec15596e5801bad59ad16cd2bf4f0fa839a1"},{"fixed":"3852478d34c7baa490ba9c7374ee901a56eea577"},{"fixed":"5b33f99f3e48465bd93219495381a5aef4fa967f"},{"fixed":"c0438198c28b1d22c272751af5e717c11d9fa8dd"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80644.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.29"},{"fixed":"5.10.261"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.212"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.97"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.40"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80644.json"}}],"schema_version":"1.9.0"}