{"cve":"CVE-2026-72197","nvd":{"published":"2026-08-15T06:21:38.323","modified":"2026-10-16T19:17:14.360","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: bound DeleteIndexEntryAllocation memmove length\n\nIn do_action()'s DeleteIndexEntryAllocation case, e->size comes\nfrom an on-disk INDEX_BUFFER entry.  When e->size makes\ne + e->size point past hdr + hdr->used,\nPtrOffset(e1, Add2Ptr(hdr, used)) returns a negative ptrdiff_t\nthat is silently cast to a quasi-infinite size_t when passed\nto memmove().  The memmove then walks past the destination\nbuffer.\n\nThe sibling DeleteIndexEntryRoot case at fslog.c:3540-3543\nalready carries the corresponding guard:\n\n\tif (PtrOffset(e1, Add2Ptr(hdr, used)) < esize ||\n\t    Add2Ptr(e, esize) > Add2Ptr(lrh, rec_len) ||\n\t    used + esize > le32_to_cpu(hdr->total)) {\n\t\tgoto dirty_vol;\n\t}\n\nApply the same shape to the allocation-path case.  Also reject\nesize == 0: memmove(e, e, ...) is a no-op and leaves\nhdr->used unchanged, hiding a malformed entry from the\nexisting check_index_header() walk.\n\nReproduced under UML+KASAN on mainline 8d90b09e6741 by\nmounting a crafted NTFS image: the unguarded memmove takes a\nlength of 0xffffffffffffff00 and the kernel oopses in\nmemmove+0x81/0x1a0 on the do_action+0x36a2 frame.\n\n[almaz.alexandrovich@paragon-software.com: clang-formatted the changes]","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.4},"cwes":[],"references":["https://git.kernel.org/stable/c/09fddd52c1b0cef2c086d61be8f3d5dc92e36565","https://git.kernel.org/stable/c/4c8aac931c1cd70347961ba5157aa916448c6a25","https://git.kernel.org/stable/c/554700c65d398276cb00a8ef95f1d5e00b9eff93","https://git.kernel.org/stable/c/b509b9613f20dc5b653d54bf78fab00d79cc43c8","https://git.kernel.org/stable/c/c38ed2ab62fab75fd6d0fdc2bee540fbebc7b959"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:48:17.459049833+00:00"},"epss":{"cve":"CVE-2026-72197","score":0.00185,"percentile":0.08011,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}