{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-43245", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-01T14:12:55.996Z", "datePublished": "2026-05-06T11:28:37.602Z", "dateUpdated": "2026-08-05T12:26:50.510Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:26:50.510Z" }, "descriptions": [ { "lang": "en", "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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ntfs3/dir.c", "fs/ntfs3/fsntfs.c", "fs/ntfs3/inode.c", "fs/ntfs3/namei.c", "fs/ntfs3/xattr.c" ], "versions": [ { "version": "a3a956c78efaa202b1d75190136671cf6e87bfbe", "lessThan": "02ecc0978c459fd90bb24b2a946dd16d43e68fe5", "status": "affected", "versionType": "git" }, { "version": "a3a956c78efaa202b1d75190136671cf6e87bfbe", "lessThan": "1be7ca86ce1794d966fda5d82181bc978b150fbc", "status": "affected", "versionType": "git" }, { "version": "a3a956c78efaa202b1d75190136671cf6e87bfbe", "lessThan": "142c444a395f4d26055c8a4473e228bb86283f1e", "status": "affected", "versionType": "git" }, { "version": "a3a956c78efaa202b1d75190136671cf6e87bfbe", "lessThan": "fb4b1f969ba01fa1d4088467a02fc1e5f0806710", "status": "affected", "versionType": "git" }, { "version": "a3a956c78efaa202b1d75190136671cf6e87bfbe", "lessThan": "ca2a04e84af79596e5cd9cfe697d5122ec39c8ce", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ntfs3/dir.c", "fs/ntfs3/fsntfs.c", "fs/ntfs3/inode.c", "fs/ntfs3/namei.c", "fs/ntfs3/xattr.c" ], "versions": [ { "version": "6.2", "status": "affected" }, { "version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.16", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.6", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.141" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.12.91" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.18.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.19.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/02ecc0978c459fd90bb24b2a946dd16d43e68fe5" }, { "url": "https://git.kernel.org/stable/c/1be7ca86ce1794d966fda5d82181bc978b150fbc" }, { "url": "https://git.kernel.org/stable/c/142c444a395f4d26055c8a4473e228bb86283f1e" }, { "url": "https://git.kernel.org/stable/c/fb4b1f969ba01fa1d4088467a02fc1e5f0806710" }, { "url": "https://git.kernel.org/stable/c/ca2a04e84af79596e5cd9cfe697d5122ec39c8ce" } ], "title": "ntfs: ->d_compare() must not block", "x_generator": { "engine": "bippy-1.2.0" } } } }