138 lines
7.3 KiB
JSON
138 lines
7.3 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-2026-74570",
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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": "2026-08-15T05:44:03.917Z",
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"datePublished": "2026-08-15T12:28:10.107Z",
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"dateUpdated": "2026-08-17T05:48:49.705Z"
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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": "2026-08-17T05:48:49.705Z"
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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: harden runlist realloc size calculations\n\nAdd a shared helper to safely convert runlist element counts to byte sizes\nusing overflow checks, and use it in both ntfs_rl_realloc() and\nntfs_rl_realloc_nofail()."
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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:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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 - Crafted NTFS metadata is parsed when remote clients read files on NFS- or SMB-exported NTFS mounts (ntfs_export_ops); nfsd/ksmbd VFS reads reach ntfs_mapping_pairs_decompress/ntfs_runlists_merge and the vulnerable ntfs_rl_realloc path without local shell access.\nAC:L - An attacker can deterministically craft NTFS mapping pairs or runlist merge sizes to force int overflow in realloc byte calculations; no races, rare configs, or victim-specific heap layout are required to trigger the undersized alloc and oversized memcpy.\nPR:N - Triggering the bug requires only access to mounted NTFS content (e.g., NFS/SMB read of an exported share or loop-mount in a user namespace with CAP_SYS_ADMIN), not real init-namespace root; no Linux superuser credentials are needed on the read/decompress code path.\nUI:N - Exploitation needs no victim interaction beyond the attacker or a remote client issuing normal filesystem reads/opens on crafted NTFS metadata; no mount dialog, USB insertion, or other user action by a separate victim is required.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same kernel security domain; it does not cross VM, container, or IOMMU boundaries to affect a separate authority.\nC:H - Integer-overflowed memcpy copies far beyond the undersized kvzalloc/kvmalloc buffer, corrupting adjacent kernel heap objects and enabling arbitrary kernel memory disclosure when leveraged for exploitation.\nI:H - The heap buffer overflow provides a strong arbitrary kernel write primitive via adjacent-object corruption and heap grooming, sufficient for control-flow hijacking and local privilege escalation.\nA:H - Corrupting kernel heap metadata reliably causes kernel oops/panic or forced reboot; even failed exploitation attempts typically crash the host, and successful exploitation can hang or kill 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/ntfs/runlist.c"
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],
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"versions": [
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{
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"version": "11ccc9107dc460de28af90fac1f42404d9802735",
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"lessThan": "57e7b8bf7b02a0140463fea786e5172cbdf2da2f",
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"status": "affected",
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"status": "affected",
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]
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{
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"product": "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/runlist.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": "7.1.8",
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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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"versionEndExcluding": "7.1.8"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/57e7b8bf7b02a0140463fea786e5172cbdf2da2f"
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},
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{
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"url": "https://git.kernel.org/stable/c/8bed376124ab4505b70083a2b91f2c7ef6d51e24"
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}
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],
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"title": "ntfs: harden runlist realloc size calculations",
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