264 lines
14 KiB
JSON
264 lines
14 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-2022-49343",
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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": "2025-02-26T02:08:31.542Z",
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"datePublished": "2025-02-26T02:10:59.970Z",
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"dateUpdated": "2026-08-05T08:54:50.163Z"
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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": "2026-08-05T08:54:50.163Z"
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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: avoid cycles in directory h-tree\n\nA maliciously corrupted filesystem can contain cycles in the h-tree\nstored inside a directory. That can easily lead to the kernel corrupting\ntree nodes that were already verified under its hands while doing a node\nsplit and consequently accessing unallocated memory. Fix the problem by\nverifying traversed block numbers are unique."
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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:N/UI:R/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 only through local VFS directory operations on a mounted crafted ext4 image (creat/mkdir → ext4_add_entry → ext4_dx_add_entry → dx_probe → do_split/index split); there is no network or adjacent-protocol entry into fs/ext4/namei.c.\nAC:L - The attacker fully controls on-disk h-tree block pointers, so a cyclic index (e.g. an intermediate node pointing back to an ancestor) deterministically makes dx_probe load the same block at multiple frame levels and then corrupts those nodes on split; no race or attacker-uncontrollable layout is required.\nPR:N - The attacker needs no account on the target—only a malicious ext4 image (USB/SD, disk image, or media handed to udisks/automount); ext4 is FS_REQUIRES_DEV without FS_USERNS_MOUNT, so CAP_SYS_ADMIN for mount belongs to the victim or automount path.\nUI:R - Exploitation requires a user or automount/storage daemon to mount the attacker-supplied ext4 volume and then perform a directory write that triggers an h-tree node split on the cyclic directory.\nS:U - Corruption and crashes remain within the host kernel’s buffer-cache/htree handling under the same OS security authority; this is standard local kernel impact, not a VM escape, IOMMU bypass, or other cross-boundary break.\nC:H - Node split on aliased frames corrupts already-verified index nodes and leads to accessing unallocated memory; that out-of-bounds/UAF-class read of kernel heap or freed buffers enables arbitrary disclosure and is scored Confidentiality High.\nI:H - The same split path (dx_insert_block/memmove and index-node rewrites through shared frame buffers) performs attacker-influenced writes into corrupted/unallocated memory, enabling heap corruption and control-flow hijack primitives scored Integrity High.\nA:H - Accessing unallocated memory during the split of a cyclic h-tree can oops/panic the kernel even without full exploitation, fully denying availability."
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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": "ac27a0ec112a089f1a5102bc8dffc79c8c815571",
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"lessThan": "24b8206fec1db21d7e82f21f0b2ff5e5672cf5b3",
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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": "ac27a0ec112a089f1a5102bc8dffc79c8c815571",
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"lessThan": "b3ad9ff6f06c1dc6abf7437691c88ca3d6da3ac0",
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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": "ac27a0ec112a089f1a5102bc8dffc79c8c815571",
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"lessThan": "e157c8f87e8fac112d6c955e69a60cdb9bc80a60",
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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": "ac27a0ec112a089f1a5102bc8dffc79c8c815571",
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"lessThan": "ff4cafa51762da3824881a9000ca421d4b78b138",
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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": "ac27a0ec112a089f1a5102bc8dffc79c8c815571",
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"lessThan": "3a3ce941645407cd0b0b7f01ad9e2ea3770f46cc",
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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": "ac27a0ec112a089f1a5102bc8dffc79c8c815571",
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"lessThan": "d5a16a6df2c16eaf4de04948553ef0089dee463f",
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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": "ac27a0ec112a089f1a5102bc8dffc79c8c815571",
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"lessThan": "6084240bfc44bf265ab6ae7d96980469b05be0f1",
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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": "ac27a0ec112a089f1a5102bc8dffc79c8c815571",
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"lessThan": "3ba733f879c2a88910744647e41edeefbc0d92b2",
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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": "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/namei.c"
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],
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"versions": [
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{
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"version": "2.6.19",
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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": "2.6.19",
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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": "4.14.283",
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"lessThanOrEqual": "4.14.*",
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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": "4.19.247",
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"lessThanOrEqual": "4.19.*",
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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": "5.4.198",
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"lessThanOrEqual": "5.4.*",
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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": "5.10.121",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.46",
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"lessThanOrEqual": "5.15.*",
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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": "5.17.14",
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"lessThanOrEqual": "5.17.*",
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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": "5.18.3",
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"lessThanOrEqual": "5.18.*",
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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": "5.19",
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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": "2.6.19",
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"versionEndExcluding": "4.14.283"
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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": "2.6.19",
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"versionEndExcluding": "4.19.247"
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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": "2.6.19",
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"versionEndExcluding": "5.4.198"
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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": "2.6.19",
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"versionEndExcluding": "5.10.121"
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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": "2.6.19",
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"versionEndExcluding": "5.15.46"
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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": "2.6.19",
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"versionEndExcluding": "5.17.14"
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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": "2.6.19",
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"versionEndExcluding": "5.18.3"
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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": "2.6.19",
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"versionEndExcluding": "5.19"
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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/24b8206fec1db21d7e82f21f0b2ff5e5672cf5b3"
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},
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{
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"url": "https://git.kernel.org/stable/c/b3ad9ff6f06c1dc6abf7437691c88ca3d6da3ac0"
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},
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{
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"url": "https://git.kernel.org/stable/c/e157c8f87e8fac112d6c955e69a60cdb9bc80a60"
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},
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{
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"url": "https://git.kernel.org/stable/c/ff4cafa51762da3824881a9000ca421d4b78b138"
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},
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{
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"url": "https://git.kernel.org/stable/c/3a3ce941645407cd0b0b7f01ad9e2ea3770f46cc"
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},
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{
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"url": "https://git.kernel.org/stable/c/d5a16a6df2c16eaf4de04948553ef0089dee463f"
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},
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{
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"url": "https://git.kernel.org/stable/c/6084240bfc44bf265ab6ae7d96980469b05be0f1"
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},
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{
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"url": "https://git.kernel.org/stable/c/3ba733f879c2a88910744647e41edeefbc0d92b2"
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}
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],
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"title": "ext4: avoid cycles in directory h-tree",
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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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} |