138 lines
7.9 KiB
JSON
138 lines
7.9 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-2026-53174",
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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": "2026-06-09T07:44:35.389Z",
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"datePublished": "2026-06-25T08:38:51.366Z",
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"dateUpdated": "2026-08-05T12:33:43.620Z"
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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": "2026-08-05T12:33:43.620Z"
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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\novl: keep err zero after successful ovl_cache_get()\n\novl_iterate_merged() stores PTR_ERR(cache) in err before checking\nIS_ERR(cache). On success err holds the truncated cache pointer and\ncan be returned as a bogus non-zero error.\n\nThe syzbot reproducer reaches this through overlay-on-overlay readdir:\n\n getdents64\n iterate_dir(outer overlay file)\n ovl_iterate_merged()\n ovl_cache_get()\n ovl_dir_read_merged()\n ovl_dir_read()\n iterate_dir(inner overlay file)\n ovl_iterate_merged()\n\nOnly compute PTR_ERR(cache) on the error path."
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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 vulnerable path is reached through local filesystem syscalls, specifically opening/enumerating nested overlayfs directories with getdents/getdents64. It is not reachable from network packets or adjacent/physical input.\nAC:L - The attacker controls the overlay-on-overlay setup and the readdir/getdents trigger, and syzbot demonstrated reproducible crashes. Any pointer-value dependency can be retried or influenced with local heap grooming, so no uncontrollable race or victim state is required.\nPR:L - Creating the crafted overlayfs setup requires local privileges, but overlayfs is marked FS_USERNS_MOUNT and is reachable in a user namespace on systems allowing unprivileged user namespaces. Thus a basic local user is sufficient in the highest reasonable deployment scenario.\nUI:N - No victim action is needed once the attacker has local execution; the attacker mounts/prepares the nested overlay and invokes getdents directly. The vulnerable code runs synchronously in the attacker's syscall path.\nS:U - The impact remains within the kernel and the local system security authority. This is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:H - The bug can convert a successful overlay directory-cache pointer into a bogus cache pointer and produce wild memory access in ovl_seek_cursor/ovl_iterate. On severe but reasonable architectures/configurations this can amount to stale/truncated kernel-pointer use, so kernel memory disclosure is defensible.\nI:H - The same wild-pointer/UAF-style path can cause overlayfs to interpret invalid or attacker-influenced memory as ovl_cache_entry state and perform cache-entry updates through it. Given the kernel memory corruption primitive and uncertainty, high integrity impact is the safer defensible choice.\nA:H - The public syzbot report is a general protection fault/Oops with KASAN wild-memory-access in ovl_iterate, reachable from getdents. A local attacker can repeatedly trigger this path to crash or panic affected kernels."
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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/overlayfs/readdir.c"
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],
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"versions": [
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{
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"version": "d25e4b739f8378419f990983f2542160e79738c5",
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"lessThan": "e7051909a01bfb883bfa78b27514854068ac4b85",
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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": "d25e4b739f8378419f990983f2542160e79738c5",
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"lessThan": "1711b6ed6953cee5940ca4c3a6e77f1b3798cee2",
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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/overlayfs/readdir.c"
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],
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"versions": [
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{
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"version": "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": "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": "7.0.13",
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"lessThanOrEqual": "7.0.*",
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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": "7.1",
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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": "6.19",
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"versionEndExcluding": "7.0.13"
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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": "6.19",
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"versionEndExcluding": "7.1"
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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/e7051909a01bfb883bfa78b27514854068ac4b85"
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},
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{
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"url": "https://git.kernel.org/stable/c/1711b6ed6953cee5940ca4c3a6e77f1b3798cee2"
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}
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],
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"title": "ovl: keep err zero after successful ovl_cache_get()",
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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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} |