152 lines
8.5 KiB
JSON
152 lines
8.5 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-2026-98315",
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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": "2026-09-25T10:25:14.339Z",
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"datePublished": "2026-10-06T08:46:10.751Z",
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"dateUpdated": "2026-10-19T09:17:25.955Z"
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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": "2026-10-19T09:17:25.955Z"
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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: protect runlist updates with the runlist lock\n\nntfs_non_resident_attr_shrink() calls runlist helpers that require the\nrunlist write lock, but did not hold it while freeing clusters and\ntruncating the runlist. Serialize those operations and the resident\nconversion with the runlist lock.\n\nntfs_attr_map_cluster() can merge a newly allocated run before updating\nmapping pairs. If the update fails, free the clusters and restore both\nthe in-memory runlist and on-disk mapping pairs from a saved runlist.\nMark the volume in error if either rollback step fails."
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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 trigger is a local ftruncate() on a file in a mounted NTFS volume, via ntfs_setattr_size()->ntfs_truncate_vfs()->__ntfs_attr_truncate_vfs()->ntfs_non_resident_attr_shrink(). That path frees clusters and calls ntfs_rl_truncate_nolock() without ni->runlist.lock. No remote protocol supplies the input; it is a locking defect on a well-formed volume.\nAC:L - The attacker runs both sides of the race: one thread dirties and fsync()s the file, driving ntfs_writeback_range()->__ntfs_write_iomap_begin(), which walks and merges ni->runlist.rl under runlist.lock. Another thread repeatedly ftruncate()s the same file, reallocating or kvfree()ing rl without that lock. It can be retried at will.\nPR:L - The attacker only needs an ordinary local account with write permission on a file in an already-mounted NTFS volume, as needed for setattr ATTR_SIZE and writeback. No capability is checked on this path.\nUI:N - No crafted image or victim mount is needed. The race works against any legitimately mounted NTFS volume, using only the attacker's own truncate and write/fsync calls on a file the attacker can already write.\nS:U - The memory corruption stays within the kernel's own security authority. No guest/host, IOMMU or sandbox boundary is crossed.\nC:H - ntfs_rl_truncate_nolock() reallocates or frees the kvmalloc'd runlist array while writeback still holds a pointer into it, so the freed slab can be reclaimed and its contents read back as cluster mappings (LCNs). That can direct I/O at arbitrary disk clusters, and is a use-after-free read of kernel memory.\nI:H - The writeback path merges new runs into the freed or reallocated runlist array (heap use-after-free write). Concurrently, ntfs_cluster_free() and the shrink update the shared runlist and on-disk mapping pairs without serialization, corrupting both kernel heap memory and filesystem metadata.\nA:H - Losing the race leads to a KASAN use-after-free or oops in the runlist walk, a double kvfree, or a corrupted runlist and mapping pairs that leave the volume inconsistent and can crash later lookups."
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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/ntfs/attrib.c",
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"fs/ntfs/attrib.h",
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"fs/ntfs/attrlist.c",
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"fs/ntfs/attrlist.h",
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"fs/ntfs/compress.c",
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"fs/ntfs/file.c",
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"fs/ntfs/inode.c",
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"fs/ntfs/mft.c"
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],
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"versions": [
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{
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"version": "495e90fa334828d4119061e2726af51d0a0fb4ed",
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"lessThan": "742797432e8c9b0dd54ecc523c185e26b09d79a0",
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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": "495e90fa334828d4119061e2726af51d0a0fb4ed",
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"lessThan": "91709ba5d6d709b2b663287b7e871e2c6b480502",
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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/ntfs/attrib.c",
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"fs/ntfs/attrib.h",
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"fs/ntfs/attrlist.c",
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"fs/ntfs/attrlist.h",
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"fs/ntfs/compress.c",
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"fs/ntfs/file.c",
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"fs/ntfs/inode.c",
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"fs/ntfs/mft.c"
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],
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"versions": [
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{
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"version": "7.1",
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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": "7.1",
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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": "7.2.8",
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"lessThanOrEqual": "7.2.*",
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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": "7.3",
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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": "7.1",
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"versionEndExcluding": "7.2.8"
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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": "7.1",
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"versionEndExcluding": "7.3"
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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/742797432e8c9b0dd54ecc523c185e26b09d79a0"
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},
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{
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"url": "https://git.kernel.org/stable/c/91709ba5d6d709b2b663287b7e871e2c6b480502"
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}
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],
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"title": "ntfs: protect runlist updates with the runlist lock",
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"x_generator": {
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