{"id":"CVE-2026-72195","title":"fs/ntfs3: bound attr_off in UpdateResidentValue against data_off","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: bound attr_off in UpdateResidentValue against data_off\n\nIn do_action()'s UpdateResidentValue case (fslog.c:3307),\nlrh->attr_off and lrh->redo_len come from th…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < ab8761676d638c5be170aaf91b7ffdd451236616","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 53c12f178f584dc5f836ffe2782138a6e9348ed9","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 546518468e6c9ea469669eef78f8cc380ad6e2ca","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 97758fd9756b5f09e9ddc6a5f6a569041acc8421","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 50b5e83384e7fed3d11d18b79ff350e9d6d89861","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < a89c66674283a0293c0f266dc57087a6114371a3","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < d1570c48f49a693974d000251030370ee2e83539","Linux 5.15"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T18:43:39.458777Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T18:45:01.278Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72195","references":[{"url":"https://git.kernel.org/stable/c/ab8761676d638c5be170aaf91b7ffdd451236616"},{"url":"https://git.kernel.org/stable/c/53c12f178f584dc5f836ffe2782138a6e9348ed9"},{"url":"https://git.kernel.org/stable/c/546518468e6c9ea469669eef78f8cc380ad6e2ca"},{"url":"https://git.kernel.org/stable/c/97758fd9756b5f09e9ddc6a5f6a569041acc8421"},{"url":"https://git.kernel.org/stable/c/50b5e83384e7fed3d11d18b79ff350e9d6d89861"},{"url":"https://git.kernel.org/stable/c/a89c66674283a0293c0f266dc57087a6114371a3"},{"url":"https://git.kernel.org/stable/c/d1570c48f49a693974d000251030370ee2e83539"}],"tags":["cve.org"],"epss":0.00169,"epssPercentile":0.05789,"ingestedAt":"2026-10-16T19:46:24.422Z","slug":"CVE-2026-72195","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: bound attr_off in UpdateResidentValue against data_off\n\nIn do_action()'s UpdateResidentValue case (fslog.c:3307),\nlrh->attr_off and lrh->redo_len come from the on-disk LRH.\nWhen they satisfy aoff + dlen < attr->res.data_off, the\nassignment\n\n\tattr->res.data_size = cpu_to_le32(aoff + dlen - data_off);\n\nunderflows to ~4 GiB (e.g. 0xFFFFFFF9 when aoff=0x10, dlen=1,\ndata_off=0x18).  Subsequent code that reads attr->res.data_size\nto walk the resident attribute payload would then read up to\n4 GiB past the 1024-byte MFT record allocation.\n\nThe existing mi_enum_attr() defense in fs/ntfs3/record.c:287\ncatches the corrupted data_size on the next attribute walk\nand fails the mount, but only on the path that walks all\nattributes.  A read site that picks an attribute by name and\nreads its data_size without re-validating is not covered.\nValidate aoff against data_off and asize at the source.\n\nReproduced under UML+KASAN on mainline 8d90b09e6741 via\npr_warn-only probe: with aoff=0x10 and data_off=0x18, the\npost-assignment data_size is 0xfffffff9 (mount then fails\nat -22 from mi_enum_attr).\n\n[almaz.alexandrovich@paragon-software.com: clang-formatted the changes]\n\n## Affected\n\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < ab8761676d638c5be170aaf91b7ffdd451236616`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 53c12f178f584dc5f836ffe2782138a6e9348ed9`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 546518468e6c9ea469669eef78f8cc380ad6e2ca`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 97758fd9756b5f09e9ddc6a5f6a569041acc8421`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 50b5e83384e7fed3d11d18b79ff350e9d6d89861`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < a89c66674283a0293c0f266dc57087a6114371a3`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < d1570c48f49a693974d000251030370ee2e83539`\n- `Linux 5.15`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}