{"api_version":"1","generated_at":"2026-08-17T11:25:09+00:00","cve":"CVE-2026-74570","urls":{"html":"https://cve.report/CVE-2026-74570","api":"https://cve.report/api/cve/CVE-2026-74570.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-74570","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-74570"},"summary":{"title":"ntfs: harden runlist realloc size calculations","description":"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().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 13:18:02","updated_at":"2026-08-17 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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":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"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."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:48:49.705Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/57e7b8bf7b02a0140463fea786e5172cbdf2da2f"},{"url":"https://git.kernel.org/stable/c/8bed376124ab4505b70083a2b91f2c7ef6d51e24"}],"title":"ntfs: harden runlist realloc size 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