209 lines
11 KiB
JSON
209 lines
11 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-2026-43245",
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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": "2026-05-01T14:12:55.996Z",
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"datePublished": "2026-05-06T11:28:37.602Z",
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"dateUpdated": "2026-08-05T12:26:50.510Z"
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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": "2026-08-05T12:26:50.510Z"
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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\nntfs: ->d_compare() must not block\n\n... so don't use __getname() there. Switch it (and ntfs_d_hash(), while\nwe are at it) to kmalloc(PATH_MAX, GFP_NOWAIT). Yes, ntfs_d_hash()\nalmost certainly can do with smaller allocations, but let ntfs folks\ndeal with that - keep the allocation size as-is for now.\n\nStop abusing names_cachep in ntfs, period - various uses of that thing\nin there have nothing to do with pathnames; just use k[mz]alloc() and\nbe done with that. For now let's keep sizes as-in, but AFAICS none of\nthe users actually want PATH_MAX."
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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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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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:N - The vulnerable `ntfs_d_compare()` is reached during ordinary VFS pathname lookup on an ntfs3 `nocase` mount; a reasonable high-impact deployment is an ntfs3 volume exported by in-kernel NFS/SMB, where remote client-supplied pathnames drive that lookup. Local syscalls can also trigger it, but the network-file-server path is the higher defensible attack vector.\nAC:L - The attacker controls the lookup pathname and can repeatedly exercise non-ASCII/case-insensitive comparisons that enter the slow path. The bug is a deterministic forbidden blocking allocation in a non-blocking VFS callback, not a race requiring conditions outside attacker influence.\nPR:N - In the network-export scenario, a remote client can issue lookup/open/stat style requests against an exported share without having local privileges on the kernel host. If authentication is configured it may raise environmental requirements, but an unauthenticated or guest-accessible export is reasonable.\nUI:N - No victim user action is required once the vulnerable ntfs3 filesystem is mounted/exported. The attacker triggers the path lookup directly by requesting crafted pathnames.\nS:U - The impact remains within the kernel/filesystem security authority. This is not a VM escape, IOMMU bypass, or cross-scope boundary violation.\nC:N - The bug is sleeping/blocking allocation in `d_compare()`, not a memory disclosure primitive. I found no out-of-bounds read, use-after-free, or arbitrary read behavior in the fixed path.\nI:N - The vulnerable code does not corrupt attacker-controlled memory or provide a write primitive. It violates VFS atomic/RCU locking rules but does not directly modify data or enable control-flow hijacking.\nA:H - Calling `__getname()`/`GFP_KERNEL` from `d_compare()` can sleep in RCU/non-blocking lookup context, causing RCU stalls, soft lockups, warnings/oopses, or deadlock under pressure. Repeated attacker-triggered lookups can therefore deny service to the kernel."
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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/ntfs3/dir.c",
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"fs/ntfs3/fsntfs.c",
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"fs/ntfs3/inode.c",
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"fs/ntfs3/namei.c",
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"fs/ntfs3/xattr.c"
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],
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"versions": [
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{
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"version": "a3a956c78efaa202b1d75190136671cf6e87bfbe",
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"lessThan": "02ecc0978c459fd90bb24b2a946dd16d43e68fe5",
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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": "a3a956c78efaa202b1d75190136671cf6e87bfbe",
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"lessThan": "1be7ca86ce1794d966fda5d82181bc978b150fbc",
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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": "a3a956c78efaa202b1d75190136671cf6e87bfbe",
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"lessThan": "142c444a395f4d26055c8a4473e228bb86283f1e",
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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": "a3a956c78efaa202b1d75190136671cf6e87bfbe",
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"lessThan": "fb4b1f969ba01fa1d4088467a02fc1e5f0806710",
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"status": "affected",
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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/ntfs3/dir.c",
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"fs/ntfs3/fsntfs.c",
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"fs/ntfs3/inode.c",
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"fs/ntfs3/namei.c",
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"fs/ntfs3/xattr.c"
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],
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"versions": [
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{
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"version": "6.2",
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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": "6.2",
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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": "6.6.141",
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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": "6.12.91",
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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": "6.18.16",
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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": "6.19.6",
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"lessThanOrEqual": "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",
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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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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/02ecc0978c459fd90bb24b2a946dd16d43e68fe5"
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},
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{
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"url": "https://git.kernel.org/stable/c/1be7ca86ce1794d966fda5d82181bc978b150fbc"
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},
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{
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"url": "https://git.kernel.org/stable/c/142c444a395f4d26055c8a4473e228bb86283f1e"
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},
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{
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"url": "https://git.kernel.org/stable/c/fb4b1f969ba01fa1d4088467a02fc1e5f0806710"
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},
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{
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"url": "https://git.kernel.org/stable/c/ca2a04e84af79596e5cd9cfe697d5122ec39c8ce"
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}
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],
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"title": "ntfs: ->d_compare() must not block",
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