234 lines
12 KiB
JSON
234 lines
12 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-2023-53626",
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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": "2025-10-07T15:16:59.656Z",
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"datePublished": "2025-10-07T15:19:30.895Z",
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"dateUpdated": "2026-10-15T21:41:32.111Z"
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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": "2026-08-05T09:15:11.541Z"
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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 possible double unlock when moving a directory"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The bug is reached through the `rename(2)` syscall on a locally mounted ext4 filesystem; no network or remote peer is involved. The attacker needs local access to mount/attach the crafted ext4 image and issue the rename.\nAC:L - The `ext4_rename_dir_prepare()` failure is deterministic with a crafted `.`/`..` entry, so the double `up_write()` always occurs, and the attacker controls every thread contending for the moved directory's `i_rwsem`. The unlock window spans a sleeping `ext4_journal_stop()`, so winning the mutual-exclusion-break race is easy and infinitely retryable.\nPR:L - An ordinary unprivileged local user suffices: on mainstream desktop/kiosk deployments udisks2's default polkit `allow_active` loop-setup and removable-media automount let a console user mount an arbitrary attacker-authored ext4 image, and the `rename(2)` itself needs only write access to the attacker's own directories.\nUI:N - In the automount/loop-setup scenario the attacker performs the mount and the rename themselves; no second user has to be induced into any action.\nS:U - The corrupted `i_rwsem`, the resulting concurrent directory mutation, and any memory corruption all stay within the kernel's own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - Breaking exclusion on a directory inode lets concurrent readers/writers race the inline-dir-to-extent conversion, so dirent parsing runs against the raw inode's `i_block`/xattr region under a stale format assumption, exposing adjacent kernel memory through `readdir`/`getdents`, and the buffer_head UAF this enables gives a further read primitive.\nI:H - The silent release of another task's exclusive `i_rwsem` allows two threads to run ext4 dirent add/delete, htree split, and inline-to-extent conversion on the same inode simultaneously, producing metadata and heap corruption — the exact corruption class `0813299c586b` was written to prevent — which is leverageable for controlled writes.\nA:H - When the lock is free at the second unlock, the rwsem count underflows to `~0UL` with no owner, so every later `down_read`/`down_write` on that directory blocks permanently in uninterruptible sleep, hanging the directory, the unmount, and eventually tripping the hung-task watchdog. The corruption path independently yields oopses and `errors=remount-ro`/`panic` filesystem shutdown."
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}
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]
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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/namei.c"
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],
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"versions": [
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{
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"version": "8dac5a63cf79707b547ea3d425fead5f4482198f",
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"lessThan": "c16cbd8233d6c58fc488545393e49b5d55729990",
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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": "0c440f14558bfacd22c6935ae1fd4b2a09e96b5d",
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"lessThan": "020166bc6669ca9fb267ebd96bd88c4fb64a5d46",
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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": "c50fc503ee1b97f12c98e26afc39fdaebebcf04f",
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"lessThan": "1c93c42c7bb23057bde8a0a2ab834927ff64d20c",
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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": "b0bb13612292ca90fa4c2a7e425375649bc50d3e",
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"lessThan": "e71eb4dca41f0f36823724ced0406bb2dbdd5506",
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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": "291cd19d107e197306869cb3237c1bba62d13182",
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"lessThan": "43ce288ab5d7274a4a141d7f5e3ed2ab7b41f8a2",
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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": "0813299c586b175d7edb25f56412c54b812d0379",
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"lessThan": "70e42feab2e20618ddd0cbfc4ab4b08628236ecd",
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"status": "affected",
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"versionType": "git"
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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": "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/namei.c"
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],
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"versions": [
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{
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"version": "5.4.237",
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"lessThan": "5.4.238",
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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": "5.10.175",
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"lessThan": "5.10.176",
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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": "5.15.103",
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"lessThan": "5.15.104",
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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": "6.1.20",
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"lessThan": "6.1.21",
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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": "6.2.7",
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"lessThan": "6.2.8",
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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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"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": "5.4.237",
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"versionEndExcluding": "5.4.238"
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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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"versionEndExcluding": "5.10.176"
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.15.103",
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"versionEndExcluding": "5.15.104"
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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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"versionStartIncluding": "6.1.20",
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"versionEndExcluding": "6.1.21"
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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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"versionStartIncluding": "6.2.7",
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"versionEndExcluding": "6.2.8"
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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/c16cbd8233d6c58fc488545393e49b5d55729990"
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},
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{
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"url": "https://git.kernel.org/stable/c/020166bc6669ca9fb267ebd96bd88c4fb64a5d46"
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},
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{
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"url": "https://git.kernel.org/stable/c/1c93c42c7bb23057bde8a0a2ab834927ff64d20c"
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},
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{
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"url": "https://git.kernel.org/stable/c/e71eb4dca41f0f36823724ced0406bb2dbdd5506"
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},
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{
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"url": "https://git.kernel.org/stable/c/43ce288ab5d7274a4a141d7f5e3ed2ab7b41f8a2"
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},
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{
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"url": "https://git.kernel.org/stable/c/70e42feab2e20618ddd0cbfc4ab4b08628236ecd"
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}
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],
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"title": "ext4: fix possible double unlock when moving a directory",
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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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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2023-53626",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:36:01.494901Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-15T21:41:32.111Z"
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}
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}
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]
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}
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} |