{"id":"CVE-2026-92503","summary":"ext4: fix ABBA deadlock in ext4_xattr_inode_cache_find()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix ABBA deadlock in ext4_xattr_inode_cache_find()\n\nSyzbot/stress-ng reported an ABBA deadlock in ext4 when exercising\nconcurrent xattr workloads (using the ea_inode mount/format option).\n\nThe deadlock occurs between the running transaction and the eviction\nthread:\n- Task 1 (stress-ng): Holds a reference to a shared mbcache_entry (ce)\n  and calls ext4_xattr_inode_cache_find() -\u003e ext4_iget() to retrieve\n  the corresponding EA inode. Since the EA inode is currently being\n  evicted, ext4_iget() blocks in __wait_on_freeing_inode() waiting for\n  eviction to complete.\n- Task 2 (eviction thread): Currently evicting the same EA inode in\n  ext4_evict_ea_inode(). It calls mb_cache_entry_wait_unused(oe) which\n  blocks waiting for Task 1 to release the reference to the mbcache_entry.\n\nTo break this deadlock, implement a new ext4_iget() configuration flag\nnamed EXT4_IGET_NOWAIT. When set, perform a non-blocking lookup of the\ninode via VFS's find_inode_nowait() API.\n\nIf the inode is currently being evicted (marked with I_FREEING or\nI_WILL_FREE) or created (I_CREATING), or if it is not present in the VFS\ninode cache (cache miss), simply skip it (returning -ENOENT) rather than\nwaiting for eviction/creation to complete, breaking the ABBA cycle.\n\nSince we return -ENOENT immediately on a cache miss, we never attempt to\nallocate a new inode or call iget_locked(), completely eliminating any\nTOCTOU race window.\n\nIf the returned inode is I_NEW, wait for its initialization to clear via\nwait_on_new_inode(). If initialization fails and the inode is unhashed\nduring wait_on_new_inode() waking up (e.g., due to an I/O read error in\nanother thread), safely drop the reference and return -ENOENT. This\nunhashed check is executed unconditionally on all cache-hit pathways to\nproperly handle concurrent initialization failures.\n\nFinally, standard validation checks (including is_bad_inode,\nEXT4_EA_INODE_FL, file_acl, and xattr flags) are executed as normal inside\ncheck_igot_inode() to fully guarantee VFS-layer safety.\n\nIn ext4_xattr_inode_cache_find(), invoke ext4_iget() with the new\nEXT4_IGET_NOWAIT flag to perform the non-blocking cache search.","modified":"2026-09-19T03:47:31.248407942Z","published":"2026-09-17T16:10:16.062Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92503.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/03438084a7b8621fb5c762dd3d04cff5f2630fb2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7720fddd1fe344d14be258a2028f74ebf1569511"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92503.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92503"},{"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":"0a46ef234756dca04623b7591e8ebb3440622f0b"},{"fixed":"7720fddd1fe344d14be258a2028f74ebf1569511"},{"fixed":"03438084a7b8621fb5c762dd3d04cff5f2630fb2"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"0752e7fb549d90c33b4d4186f11cfd25a556d1dd"},{"last_affected":"737fb7853acd5bc8984f6f42e4bfba3334be8ae1"},{"last_affected":"111103907234bffd0a34fba070ad9367de058752"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.1.107"},{"fixed":"6.2"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.6.47"},{"fixed":"6.7"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.9.7"},{"fixed":"6.10"}]}],"versions":["v6.1.106","v6.6.46","v6.1.105","v6.6.45","v6.1.104","v6.6.44","v6.1.103","v6.6.43","v6.1.102","v6.6.42","v6.1.101","v6.6.41","v6.1.100","v6.6.40","v6.1.99","v6.6.39","v6.1.98","v6.9-rc1","v6.6.38","v6.1.97","v6.6.37","v6.6.36","v6.1.96","v6.9.6","v6.6.35","v6.1.95","v6.9","v6.9.5","v6.6.34","v6.1.94","v6.9.4","v6.6.33","v6.1.93","v6.9.3","v6.6.32","v6.1.92","v6.9.2","v6.9.1","v6.6.31","v6.1.91","v6.6.30","v6.1.90","v6.9-rc6","v6.9-rc7","v6.9-rc5","v6.9-rc3","v6.9-rc2","v6.8","v6.9-rc4","v6.6.29","v6.1.89","v6.1.88","v6.6.28","v6.1.87","v6.8-rc1","v6.6.27","v6.1.86","v6.6.26","v6.1.85","v6.6.25","v6.1.84","v6.6.24","v6.6.23","v6.1.83","v6.1.82","v6.6.22","v6.7-rc1","v6.8-rc7","v6.1.81","v6.6.21","v6.8-rc6","v6.8-rc5","v6.8-rc4","v6.8-rc3","v6.8-rc2","v6.6.20","v6.1.80","v6.6.19","v6.6.18","v6.1.79","v6.6.17","v6.1.78","v6.6.16","v6.1.77","v6.6.15","v6.1.76","v6.6.14","v6.1.75","v6.6.13","v6.1.74","v6.7","v6.6.12","v6.1.73","v6.7-rc3","v6.7-rc8","v6.6.11","v6.1.72","v6.7-rc7","v6.6.10","v6.1.71","v6.6.9","v6.1.70","v6.7-rc6","v6.6.8","v6.1.69","v6.7-rc2","v6.6.7","v6.1.68","v6.7-rc4","v6.7-rc5","v6.6.6","v6.1.67","v6.1.66","v6.6.5","v6.6.4","v6.1.65","v6.6","v6.6.3","v6.1.64","v6.6.2","v6.1.63","v6.6.1","v6.1.62","v6.6-rc1","v6.1.61","v6.1.60","v6.6-rc5","v6.6-rc3","v6.6-rc7","v6.6-rc6","v6.6-rc4","v6.1.59","v6.1.58","v6.6-rc2","v6.1.57","v6.1.56","v6.1.55","v6.5","v6.1.54","v6.5-rc1","v6.1.53","v6.1.52","v6.5-rc2","v6.1.51","v6.5-rc7","v6.1.50","v6.1.49","v6.1.48","v6.1.47","v6.5-rc4","v6.5-rc3","v6.1.46","v6.5-rc6","v6.1.45","v6.5-rc5","v6.1.44","v6.1.43","v6.1.42","v6.1.41","v6.1.40","v6.1.39","v6.1.38","v6.4","v6.4-rc7","v6.4-rc1","v6.1.37","v6.1.36","v6.4-rc6","v6.1.35","v6.4-rc5","v6.4-rc3","v6.1.34","v6.4-rc4","v6.4-rc2","v6.1.33","v6.1.32","v6.1.31","v6.1.30","v6.1.29","v6.1.28","v6.3","v6.1.27","v6.1.26","v6.3-rc1","v6.1.25","v6.3-rc7","v6.3-rc2","v6.3-rc3","v6.3-rc5","v6.3-rc6","v6.3-rc4","v6.1.24","v6.2-rc6","v6.1.23","v6.1.22","v6.1.21","v6.1.20","v6.1.19","v6.1.18","v6.1.17","v6.1.16","v6.1.15","v6.2-rc1","v6.2","v6.1.14","v6.1.13","v6.2-rc2","v6.2-rc8","v6.1.12","v6.2-rc5","v6.2-rc4","v6.1.11","v6.2-rc7","v6.1.10","v6.2-rc3","v6.1.9","v6.1.8","v6.1.7","v6.1.6","v6.1-rc1","v6.1.5","v6.1.4","v6.1.3","v6.1.2","v6.1.1","v6.1","v6.1-rc8","v6.1-rc3","v6.1-rc6","v6.1-rc7","v6.1-rc4","v6.1-rc2","v6.1-rc5","v6.0-rc1","v6.0","v6.0-rc7","v6.0-rc3","v6.0-rc2","v6.0-rc6","v6.0-rc4","v6.0-rc5","v5.19","v5.19-rc1","v5.19-rc5","v5.19-rc8","v5.19-rc6","v5.18","v5.19-rc2","v5.19-rc7","v5.19-rc3","v5.19-rc4","v5.18-rc1","v5.18-rc7","v5.18-rc2","v5.18-rc5","v5.17","v5.18-rc4","v5.18-rc3","v5.18-rc6","v5.17-rc6","v5.17-rc4","v5.17-rc8","v5.17-rc7","v5.17-rc1","v5.17-rc3","v5.17-rc2","v5.17-rc5","v5.16","v5.16-rc1","v5.16-rc8","v5.16-rc5","v5.16-rc6","v5.16-rc7","v5.16-rc3","v5.16-rc2","v5.16-rc4","v5.15","v5.15-rc2","v5.15-rc1","v5.15-rc4","v5.15-rc7","v5.15-rc3","v5.15-rc5","v5.15-rc6","v5.14","v5.14-rc3","v5.14-rc1","v5.14-rc2","v5.14-rc7","v5.14-rc6","v5.13-rc1","v5.14-rc5","v5.14-rc4","v5.13","v5.13-rc6","v5.13-rc7","v5.13-rc3","v5.13-rc2","v5.13-rc4","v5.13-rc5","v5.12","v5.12-rc2","v5.12-rc1-dontuse","v5.12-rc1","v5.12-rc8","v5.12-rc3","v5.12-rc7","v5.12-rc5","v5.12-rc6","v5.12-rc4","v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