{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74570","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-15T05:44:03.917Z","datePublished":"2026-08-15T12:28:10.107Z","dateUpdated":"2026-08-17T05:48:49.705Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:48:49.705Z"},"descriptions":[{"lang":"en","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()."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL"},"scenarios":[{"lang":"en","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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs/runlist.c"],"versions":[{"version":"11ccc9107dc460de28af90fac1f42404d9802735","lessThan":"57e7b8bf7b02a0140463fea786e5172cbdf2da2f","status":"affected","versionType":"git"},{"version":"11ccc9107dc460de28af90fac1f42404d9802735","lessThan":"8bed376124ab4505b70083a2b91f2c7ef6d51e24","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/ntfs/runlist.c"],"versions":[{"version":"7.1","status":"affected"},{"version":"0","lessThan":"7.1","status":"unaffected","versionType":"semver"},{"version":"7.1.8","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","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":"7.1","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.1","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/57e7b8bf7b02a0140463fea786e5172cbdf2da2f"},{"url":"https://git.kernel.org/stable/c/8bed376124ab4505b70083a2b91f2c7ef6d51e24"}],"title":"ntfs: harden runlist realloc size calculations","x_generator":{"engine":"bippy-1.2.0"}}}}