193 lines
9.8 KiB
JSON
193 lines
9.8 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-2022-50746",
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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": "2025-12-24T13:02:21.543Z",
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"datePublished": "2025-12-24T13:05:42.628Z",
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"dateUpdated": "2026-10-15T21:41:23.468Z"
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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": "2026-08-05T08:59:35.903Z"
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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\nerofs: validate the extent length for uncompressed pclusters\n\nsyzkaller reported a KASAN use-after-free:\nhttps://syzkaller.appspot.com/bug?extid=2ae90e873e97f1faf6f2\n\nThe referenced fuzzed image actually has two issues:\n - m_pa == 0 as a non-inlined pcluster;\n - The logical length is longer than its physical length.\n\nThe first issue has already been addressed. This patch addresses\nthe second issue by checking the extent length validity."
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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:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.4,
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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 after a local EROFS mount and read/mmap/open (z_erofs_read_folio → z_erofs_do_map_blocks → z_erofs_transform_plain); erofs has FS_REQUIRES_DEV and no network-protocol entry into the decompressor.\nAC:L - A crafted image with a PLAIN pcluster whose logical extent length exceeds its physical length deterministically drives outpages > inpages and the oversized memcpy on ordinary file open/read, with no race or attacker-uncontrollable condition.\nPR:N - The attacker only needs to supply the malicious image; mounting is performed by an automated consumer (container/composefs/APEX/OTA image runtime or removable-media automounter) and requires no account or capability on the target.\nUI:N - In those deployments the mount and subsequent open/read (including IMA measurement on open as in the syzbot crash) happen as part of image pull/run or media insertion, with no separate interactive victim step required.\nS:U - The OOB/UAF copy and resulting kernel memory corruption stay within the host kernel's security authority; no VM escape, IOMMU bypass, or other cross-boundary impact occurs.\nC:H - KASAN reports a use-after-free read of 4096 bytes where memcpy copies adjacent/freed kernel memory into the file's page cache, which userspace can then read—an arbitrary kernel-memory disclosure.\nI:H - The same path is a UAF/OOB memory-corruption class bug (and can take the memmove path that writes past the source page), which per kernel guidance enables heap corruption and control-flow hijacking primitives.\nA:H - The demonstrated KASAN use-after-free/out-of-bounds access can oops or panic the kernel even when not fully exploited, which is Availability High under kernel CVSS guidance."
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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/erofs/zmap.c"
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],
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"versions": [
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{
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"version": "02827e1796b33f1794966f5c3101f8da2dfa9c1d",
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"lessThan": "dc8b6bd587b13b85aff6e9d36cdfcd3f955cac9e",
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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": "02827e1796b33f1794966f5c3101f8da2dfa9c1d",
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"lessThan": "40c73b2ea9611b5388807be406f30f5e4e1162da",
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"status": "affected",
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"versionType": "git"
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{
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"lessThan": "c505feba4c0d76084e56ec498ce819f02a7043ae",
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"status": "affected",
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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/erofs/zmap.c"
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],
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"versions": [
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{
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"version": "4.19",
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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": "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": "6.0.16",
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"lessThanOrEqual": "6.0.*",
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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": "6.1.2",
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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": "6.2",
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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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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.19",
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"versionEndExcluding": "6.0.16"
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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": "4.19",
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"versionEndExcluding": "6.1.2"
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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": "4.19",
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}
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/dc8b6bd587b13b85aff6e9d36cdfcd3f955cac9e"
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},
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{
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"url": "https://git.kernel.org/stable/c/40c73b2ea9611b5388807be406f30f5e4e1162da"
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},
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{
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"url": "https://git.kernel.org/stable/c/c505feba4c0d76084e56ec498ce819f02a7043ae"
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}
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],
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"title": "erofs: validate the extent length for uncompressed pclusters",
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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-2022-50746",
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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": "2026-10-15T21:32:20.485898Z"
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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": "2026-10-15T21:41:23.468Z"
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}
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}
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}
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} |