{"apiVersion":"1.0","identifier":"CVE-2026-72197","description":"In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound DeleteIndexEntryAllocation memmove length In do_action()-s DeleteIndexEntryAllocation case, e->size comes from an on-disk INDEX_BUFFER entry. When e->size makes e + e->size point past hdr + hdr->used, PtrOffset(e1, Add2Ptr(hdr, used)) returns a negative ptrdiff_t that is silently cast to a quasi-infinite size_t when passed to memmove(). The memmove then walks past the destination buffer. The sibling DeleteIndexEntryRoot case at fslog.c:3540-3543 already carries the corresponding guard: if (PtrOffset(e1, Add2Ptr(hdr, used)) < esize || Add2Ptr(e, esize) > Add2Ptr(lrh, rec_len) || used + esize > le32_to_cpu(hdr->total)) { goto dirty_vol; } Apply the same shape to the allocation-path case. Also reject esize == 0: memmove(e, e, ...) is a no-op and leaves hdr->used unchanged, hiding a malformed entry from the existing check_index_header() walk. Reproduced under UML+KASAN on mainline 8d90b09e6741 by mounting a crafted NTFS image: the unguarded memmove takes a length of 0xffffffffffffff00 and the kernel oopses in memmove+0x81/0x1a0 on the do_action+0x36a2 frame. [almaz.alexandrovich@paragon-software.com: clang-formatted the changes]","publishedAt":"2026-08-15T06:21:38","lastModifiedAt":"2026-08-17T06:18:20","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-72197","cvssScore":8.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.00185,"riskScore":0.85,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-72197","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-72197","en":"https://www.redsauce.net/en/cves/CVE-2026-72197","fr":"https://www.redsauce.net/fr/cves/CVE-2026-72197","pt":"https://www.redsauce.net/pt/cves/CVE-2026-72197","de":"https://www.redsauce.net/de/cves/CVE-2026-72197","sk":"https://www.redsauce.net/sk/cves/CVE-2026-72197","el":"https://www.redsauce.net/el/cves/CVE-2026-72197"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-72197"}}