{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72195","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-09T03:40:39.911Z","datePublished":"2026-08-15T05:53:54.869Z","dateUpdated":"2026-08-17T05:41:21.899Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:41:21.899Z"},"descriptions":[{"lang":"en","value":"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 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]"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The bug is reached only when the kernel mounts an attacker-controlled NTFS volume and replays $LogFile via ntfs_loadlog_and_replay→log_replay→do_action(UpdateResidentValue); exploitation uses the local mount syscall on a block/loop device, not a network-facing kernel service.\nAC:L - The attacker fully controls malicious on-disk LRH fields (attr_off, redo_len, data) in $LogFile; triggering the data_size underflow is deterministic once the crafted volume is mounted, with no races or conditions outside attacker control.\nPR:L - Mounting ntfs3 requires CAP_SYS_ADMIN in the mount namespace; an unprivileged local attacker can obtain this via user namespaces (unshare -Ur) and loop-mount a crafted NTFS image, without real root in the initial user namespace.\nUI:N - No victim interaction is required when the attacker mounts their own malicious NTFS image in a user namespace; exploitation does not depend on another user plugging in media, opening a file, or performing an additional action.\nS:U - The vulnerability corrupts kernel heap metadata during filesystem journal replay on the mounting host; impact stays within the kernel's security authority and does not constitute a VM escape, sandbox escape, or cross-authority boundary change.\nC:H - Unsigned underflow sets attr->res.data_size to ~4 GiB; subsequent resident-attribute consumers that trust data_size can read far beyond the ~1 KiB kmalloc MFT record allocation, disclosing adjacent kernel heap memory.\nI:H - The underflow corrupts resident-attribute metadata and UpdateResidentValue memmove paths using attacker-controlled offsets can overwrite attribute headers and drive out-of-bounds writes during replay, enabling heap corruption suitable for control-flow hijacking.\nA:H - Malformed journal replay can trigger kernel faults (KASAN/oops) or abort mount; repeated mount attempts against the malicious image cause persistent denial of service on the affected system."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ntfs3/fslog.c"],"versions":[{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","lessThan":"ab8761676d638c5be170aaf91b7ffdd451236616","status":"affected","versionType":"git"},{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","lessThan":"53c12f178f584dc5f836ffe2782138a6e9348ed9","status":"affected","versionType":"git"},{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","lessThan":"546518468e6c9ea469669eef78f8cc380ad6e2ca","status":"affected","versionType":"git"},{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","lessThan":"97758fd9756b5f09e9ddc6a5f6a569041acc8421","status":"affected","versionType":"git"},{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","lessThan":"50b5e83384e7fed3d11d18b79ff350e9d6d89861","status":"affected","versionType":"git"},{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","lessThan":"a89c66674283a0293c0f266dc57087a6114371a3","status":"affected","versionType":"git"},{"version":"b46acd6a6a627d876898e1c84d3f84902264b445","lessThan":"d1570c48f49a693974d000251030370ee2e83539","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/ntfs3/fslog.c"],"versions":[{"version":"5.15","status":"affected"},{"version":"0","lessThan":"5.15","status":"unaffected","versionType":"semver"},{"version":"5.15.212","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.5","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":"5.15","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.2"}]}]}],"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"}],"title":"fs/ntfs3: bound attr_off in UpdateResidentValue against data_off","x_generator":{"engine":"bippy-1.2.0"}}}}