{"cve":"CVE-2026-80644","nvd":{"published":"2026-08-28T08:16:49.290","modified":"2026-08-28T08:16:49.290","status":"Received","description":"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->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.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/12c32a7350b670aaaaf2e01583d8648ec0c9755c","https://git.kernel.org/stable/c/3852478d34c7baa490ba9c7374ee901a56eea577","https://git.kernel.org/stable/c/5b33f99f3e48465bd93219495381a5aef4fa967f","https://git.kernel.org/stable/c/86509c5296fe46ad6bcdd83931a53c2c6b7913a8","https://git.kernel.org/stable/c/a06eec15596e5801bad59ad16cd2bf4f0fa839a1"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:50.842544443+00:00"},"epss":{"cve":"CVE-2026-80644","score":0.0022,"percentile":0.12521,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}