238 lines
13 KiB
JSON
238 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-92503",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-16T12:21:13.872Z",
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"datePublished": "2026-09-17T16:10:16.062Z",
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"dateUpdated": "2026-10-30T12:35:43.123Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-30T12:35:43.123Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "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() -> 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."
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/ext4/ext4.h",
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"fs/ext4/inode.c",
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"fs/ext4/xattr.c"
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],
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"versions": [
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{
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"version": "0752e7fb549d90c33b4d4186f11cfd25a556d1dd",
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"lessThan": "e5e883ffe5230320060ea613a1acf750f3161c95",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "737fb7853acd5bc8984f6f42e4bfba3334be8ae1",
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"lessThan": "29a2a166450a3e89f61a486033b10cf170fde8b0",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0a46ef234756dca04623b7591e8ebb3440622f0b",
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"lessThan": "d3b19b318e0e0483180d15f1d9f5e807a1fb59d5",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0a46ef234756dca04623b7591e8ebb3440622f0b",
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"lessThan": "074d0620401974cbfa9b63684cdfae99c7b2059c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0a46ef234756dca04623b7591e8ebb3440622f0b",
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"lessThan": "7720fddd1fe344d14be258a2028f74ebf1569511",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0a46ef234756dca04623b7591e8ebb3440622f0b",
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"lessThan": "03438084a7b8621fb5c762dd3d04cff5f2630fb2",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "111103907234bffd0a34fba070ad9367de058752",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "6.1.107",
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"lessThan": "6.1.191",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.6.47",
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"lessThan": "6.6.160",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.9.7",
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"lessThan": "6.10",
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"status": "affected",
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"versionType": "semver"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/ext4/ext4.h",
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"fs/ext4/inode.c",
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"fs/ext4/xattr.c"
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],
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"versions": [
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{
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"version": "6.10",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.10",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.114",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.57",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.1.107",
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"versionEndExcluding": "6.1.191"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.10",
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{
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/e5e883ffe5230320060ea613a1acf750f3161c95"
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},
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{
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"url": "https://git.kernel.org/stable/c/29a2a166450a3e89f61a486033b10cf170fde8b0"
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},
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{
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"url": "https://git.kernel.org/stable/c/d3b19b318e0e0483180d15f1d9f5e807a1fb59d5"
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},
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{
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"url": "https://git.kernel.org/stable/c/074d0620401974cbfa9b63684cdfae99c7b2059c"
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},
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{
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"url": "https://git.kernel.org/stable/c/7720fddd1fe344d14be258a2028f74ebf1569511"
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},
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{
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"url": "https://git.kernel.org/stable/c/03438084a7b8621fb5c762dd3d04cff5f2630fb2"
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}
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],
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"title": "ext4: fix ABBA deadlock in ext4_xattr_inode_cache_find()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |