138 lines
8.1 KiB
JSON
138 lines
8.1 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-2026-72471",
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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": "2026-08-09T03:40:39.934Z",
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"datePublished": "2026-08-15T05:57:13.117Z",
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"dateUpdated": "2026-08-17T05:44:36.197Z"
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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": "2026-08-17T05:44:36.197Z"
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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\nfs/ntfs3: prevent potential lcn remains uninitialized\n\nThe target VCN being sought was not found within runs[0], causing\nrun_lookup() to return false. This causes run_lookup_entry() to return\nfalse, which in turn results in a len value of 0, and the new parameter\npassed to attr_data_get_block() is NULL. Collectively, these factors\nultimately cause attr_data_get_block_locked() to exit prematurely without\ninitializing lcn, thereby triggering [1].\n\nTo prevent [1], the clen check within ni_seek_data_or_hole() has been\nmoved to occur before the lcn check.\n\n[1]\nBUG: KMSAN: uninit-value in ni_seek_data_or_hole+0x24f/0x5f0 fs/ntfs3/frecord.c:2862\n ni_seek_data_or_hole+0x24f/0x5f0 fs/ntfs3/frecord.c:2862\n ntfs_llseek+0x22a/0x4a0 fs/ntfs3/file.c:1530\n vfs_llseek fs/read_write.c:391 [inline]"
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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:L/UI:N/S:U/C:H/I:L/A:N",
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"baseScore": 7.1,
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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 - On servers exporting an NTFS3-backed volume via ksmbd or nfsd, a remote client can trigger ntfs_llseek(SEEK_DATA/SEEK_HOLE) through FSCTL_QUERY_ALLOCATED_RANGES or NFS SEEK operations, exercising ni_seek_data_or_hole() without local shell access.\nAC:L - The bug is reliably reproducible with attacker-crafted NTFS metadata where the target VCN is absent from runs[0], causing attr_data_get_block_locked() to return success with clen=0 and leave lcn uninitialized; syzkaller demonstrated deterministic triggering.\nPR:L - Exploitation requires only an unprivileged local user with read access to a file on a mounted ntfs3 volume, or an authenticated SMB/NFS client with permission to open/query that file; mounting the filesystem itself is not required for the trigger path.\nUI:N - On typical server deployments the NTFS volume is already mounted and exported; the attacker only needs network or local file access to invoke lseek/SEEK_DATA/SEEK_HOLE on crafted metadata, with no additional victim interaction beyond normal file access.\nS:U - The flaw is confined to incorrect ntfs3 SEEK_DATA/SEEK_HOLE handling in kernel filesystem code and does not cross VM, container, or IOMMU security boundaries; impact remains within the same kernel security authority.\nC:H - ni_seek_data_or_hole() compares uninitialized stack variable lcn against RESIDENT_LCN/EOF_LCN/SPARSE_LCN before validating clen==0, constituting a kernel uninitialized-memory read whose branch outcomes and returned seek offsets can leak kernel stack residue to userspace or remote SMB/NFS clients.\nI:L - Garbage lcn values can force incorrect SEEK_DATA/SEEK_HOLE results (wrong offsets, premature -ENXIO, or invalid positions), corrupting the integrity of file-offset queries returned to local processes or remote clients even though no arbitrary kernel write primitive is demonstrated.\nA:N - The reported failure mode is a KMSAN uninit-value in ni_seek_data_or_hole(); production kernels without KMSAN take mis-branches that return errors or incorrect offsets rather than oopsing, panicking, or hanging the system."
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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/frecord.c"
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],
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"versions": [
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{
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"version": "c61326967728392931f8a2240cb2cf4c81b523c1",
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"lessThan": "7ae7e98b71438c494532492cbf58fc0d7f7988bb",
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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": "c61326967728392931f8a2240cb2cf4c81b523c1",
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"lessThan": "57ac2831c8e0f168090d38e3de758c6a59db44db",
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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/ntfs3/frecord.c"
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],
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"versions": [
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{
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"version": "7.0",
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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": "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": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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{
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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": "7.0",
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"versionEndExcluding": "7.1.5"
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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": "7.0",
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"versionEndExcluding": "7.2"
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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/7ae7e98b71438c494532492cbf58fc0d7f7988bb"
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},
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{
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"url": "https://git.kernel.org/stable/c/57ac2831c8e0f168090d38e3de758c6a59db44db"
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}
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],
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"title": "fs/ntfs3: prevent potential lcn remains uninitialized",
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"x_generator": {
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