{"cve":"CVE-2026-80879","nvd":{"published":"2026-09-04T17:17:00.080","modified":"2026-09-04T17:17:00.080","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix circular locking dependency in ocfs2_dio_end_io_write\n\nA circular locking dependency involves INODE_ALLOC_SYSTEM_INODE,\nEXTENT_ALLOC_SYSTEM_INODE, and ORPHAN_DIR_SYSTEM_INODE.\n\n1. ocfs2_mknod() acquires INODE_ALLOC then EXTENT_ALLOC.\n\n2. ocfs2_dio_end_io_write() acquires EXTENT_ALLOC for unwritten\n   extents, then ORPHAN_DIR via ocfs2_del_inode_from_orphan() while still\n   holding EXTENT_ALLOC.\n\n3. ocfs2_wipe_inode() acquires ORPHAN_DIR then INODE_ALLOC via\n   ocfs2_remove_inode.\n\nBreak the cycle in ocfs2_dio_end_io_write() by freeing the allocation\ncontexts (releasing EXTENT_ALLOC) before acquiring ORPHAN_DIR.\n\nWARNING: possible circular locking dependency detected\n------------------------------------------------------\nis trying to acquire lock:\nffff8881e78b33a0\n(&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at:\nocfs2_evict_inode+0x1539/0x43b0 fs/ocfs2/inode.c:1299\n\nbut task is already holding lock:\nffff8881e78b4fa0\n(&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}, at:\nocfs2_evict_inode+0xe97/0x43b0 fs/ocfs2/inode.c:1299\n\nthe existing dependency chain (in reverse order) is:\n\n-> #2 (&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}:\n       inode_lock include/linux/fs.h:1029 [inline]\n       ocfs2_del_inode_from_orphan+0x12e/0x7a0 fs/ocfs2/namei.c:2728\n       ocfs2_dio_end_io+0xf9c/0x1370 fs/ocfs2/aops.c:2418\n       dio_complete+0x25b/0x790 fs/direct-io.c:281\n\n-> #1 (&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}:\n       inode_lock include/linux/fs.h:1029 [inline]\n       ocfs2_reserve_suballoc_bits+0x16d/0x4840 fs/ocfs2/suballoc.c:882\n       ocfs2_reserve_new_metadata_blocks+0x415/0x9a0\n       fs/ocfs2/suballoc.c:1078\n       ocfs2_mknod+0x10f3/0x2260 fs/ocfs2/namei.c:351\n\n-> #0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}:\n       __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237\n       lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868\n       down_write+0x96/0x200 kernel/locking/rwsem.c:1625\n       inode_lock include/linux/fs.h:1029 [inline]\n       ocfs2_remove_inode fs/ocfs2/inode.c:733 [inline]\n       ocfs2_wipe_inode fs/ocfs2/inode.c:896 [inline]\n       ocfs2_delete_inode fs/ocfs2/inode.c:1157 [inline]\n       ocfs2_evict_inode+0x1539/0x43b0 fs/ocfs2/inode.c:1299\n\nChain exists of:\n  &ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE] -->\n  &ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE] -->\n  &ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]\n\n Possible unsafe locking scenario:\n\n       CPU0                    CPU1\n       ----                    ----\n  lock(&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]);\n                               lock(&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]);\n                               lock(&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]);\n  lock(&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]);\n\n *** DEADLOCK ***","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/137e8b4823a9a11928428d4ec0a0cacb2f50a769","https://git.kernel.org/stable/c/4273548e418bd935430d35e9d052870f323441f3","https://git.kernel.org/stable/c/49b34bd3ad69611af03590a23abf2cda9ac1073d","https://git.kernel.org/stable/c/ae1f3460833d3e427420ab260278ec0e45d68c86","https://git.kernel.org/stable/c/f0ae0a6ca87dc2d4a789f71cdedb808ba6c16990"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:52:03.409947763+00:00"},"epss":{"cve":"CVE-2026-80879","score":0.0022,"percentile":0.12507,"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."]}