{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-90131", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.788Z", "datePublished": "2026-09-17T16:06:31.913Z", "dateUpdated": "2026-09-17T16:06:31.913Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-17T16:06:31.913Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: serialize resident iomap reads with mrec_lock\n\nntfs_read_iomap_begin_resident() walks the MFT record through\nntfs_attr_lookup() -> ntfs_attr_find() without taking ni->mrec_lock,\nwhile ntfs_attr_record_resize(), ntfs_make_room_for_attr() and\nntfs_resident_attr_record_add() memmove() the same base_ni->mrec buffer\nunder that lock. map_mft_record() only takes a reference and does not\nserialize, so the reader can observe torn attribute length and offset\nfields while a writer is relocating the records.\n\nKCSAN reports the race between the mmap read fault path and both link()\nand unlink():\n\n BUG: KCSAN: data-race in ntfs_attr_find / ntfs_attr_record_resize\n\n write to 0xffff888100af1018 of 4 bytes by task 96 on cpu 1:\n ntfs_attr_record_resize+0xd2/0x130\n ntfs_attr_record_rm+0xad/0x530\n ntfs_delete+0x224/0x640\n ntfs_unlink+0x14d/0x280\n vfs_unlink+0x157/0x520\n\n read to 0xffff888100af1018 of 4 bytes by task 95 on cpu 0:\n ntfs_attr_find+0x104/0x5b0\n ntfs_attr_lookup+0x39c/0x10c0\n ntfs_read_iomap_begin_resident+0xc6/0x230\n ntfs_read_iomap_begin+0x5d/0xa0\n iomap_iter+0x2e2/0x6e0\n iomap_read_folio+0x147/0x2a0\n ntfs_read_folio+0x108/0x170\n filemap_read_folio+0x35/0x100\n filemap_fault+0x993/0x1000\n\n value changed: 0x00000250 -> 0x000001f0\n\nThe address is mrec + 0x18, i.e. mft_record.bytes_in_use, and the change\nis the 96 bytes of one $FILE_NAME attribute being removed.\n\nKeep base_ni->mrec_lock from the resident read iomap lookup through\niomap_end(). This protects both the attribute walk and the subsequent copy\nfrom iomap->inline_data, which points into the MFT record. The non-resident\npath is left alone: ntfs_lookup() already holds the directory inode's\nmrec_lock when it reads an index folio through read_mapping_folio(), and\ntaking the lock in the shared wrapper deadlocks there with recursive locking\non mrec_lock. The comment above the read_mapping_folio() call in\nfs/ntfs/dir.c notes the same hazard.\n\nThe seek path uses the same lookup helper but does not dereference\niomap->inline_data. Release the lock before returning from that path,\nwhereas the regular read path records base_ni in iomap->private and releases\nthe lock from its iomap_end() callback.\n\nTested with a reproducer that faults in a 16-byte resident file while\nanother thread runs link()/unlink() on it. Before: 40 KCSAN reports in\nabout one second. After: no reports in 180 seconds over 206,090 read\niterations and 423,540 link/unlink cycles. A PROVE_LOCKING build shows no\nlockdep splat with the same reproducer running for 60 seconds."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ntfs/iomap.c"], "versions": [{"version": "b041ca562526b3c4a71b41b80ba5e520eac636ad", "lessThan": "0400e0d50eb3be19c98323faa322b652e4ae3f99", "status": "affected", "versionType": "git"}, {"version": "b041ca562526b3c4a71b41b80ba5e520eac636ad", "lessThan": "d9e00c457d4ab8ab59c6e4b8554c921260e4e16c", "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/ntfs/iomap.c"], "versions": [{"version": "7.1", "status": "affected"}, {"version": "0", "lessThan": "7.1", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "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": "7.1", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.1", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/0400e0d50eb3be19c98323faa322b652e4ae3f99"}, {"url": "https://git.kernel.org/stable/c/d9e00c457d4ab8ab59c6e4b8554c921260e4e16c"}], "title": "ntfs: serialize resident iomap reads with mrec_lock", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/ntfs/iomap.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "0400e0d50eb3be19c98323faa322b652e4ae3f99", "status": "affected", "version": "b041ca562526b3c4a71b41b80ba5e520eac636ad", "versionType": "git"}, {"lessThan": "d9e00c457d4ab8ab59c6e4b8554c921260e4e16c", "status": "affected", "version": "b041ca562526b3c4a71b41b80ba5e520eac636ad", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/ntfs/iomap.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.1"}, {"lessThan": "7.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nntfs: serialize resident iomap reads with mrec_lock\n\nntfs_read_iomap_begin_resident() walks the MFT record through\nntfs_attr_lookup() -> ntfs_attr_find() without taking ni->mrec_lock,\nwhile ntfs_attr_record_resize(), ntfs_make_room_for_attr() and\nntfs_resident_attr_record_add() memmove() the same base_ni->mrec buffer\nunder that lock. map_mft_record() only takes a reference and does not\nserialize, so the reader can observe torn attribute length and offset\nfields while a writer is relocating the records.\n\nKCSAN reports the race between the mmap read fault path and both link()\nand unlink():\n\n BUG: KCSAN: data-race in ntfs_attr_find / ntfs_attr_record_resize\n\n write to 0xffff888100af1018 of 4 bytes by task 96 on cpu 1:\n ntfs_attr_record_resize+0xd2/0x130\n ntfs_attr_record_rm+0xad/0x530\n ntfs_delete+0x224/0x640\n ntfs_unlink+0x14d/0x280\n vfs_unlink+0x157/0x520\n\n read to 0xffff888100af1018 of 4 bytes by task 95 on cpu 0:\n ntfs_attr_find+0x104/0x5b0\n ntfs_attr_lookup+0x39c/0x10c0\n ntfs_read_iomap_begin_resident+0xc6/0x230\n ntfs_read_iomap_begin+0x5d/0xa0\n iomap_iter+0x2e2/0x6e0\n iomap_read_folio+0x147/0x2a0\n ntfs_read_folio+0x108/0x170\n filemap_read_folio+0x35/0x100\n filemap_fault+0x993/0x1000\n\n value changed: 0x00000250 -> 0x000001f0\n\nThe address is mrec + 0x18, i.e. mft_record.bytes_in_use, and the change\nis the 96 bytes of one $FILE_NAME attribute being removed.\n\nKeep base_ni->mrec_lock from the resident read iomap lookup through\niomap_end(). This protects both the attribute walk and the subsequent copy\nfrom iomap->inline_data, which points into the MFT record. The non-resident\npath is left alone: ntfs_lookup() already holds the directory inode's\nmrec_lock when it reads an index folio through read_mapping_folio(), and\ntaking the lock in the shared wrapper deadlocks there with recursive locking\non mrec_lock. The comment above the read_mapping_folio() call in\nfs/ntfs/dir.c notes the same hazard.\n\nThe seek path uses the same lookup helper but does not dereference\niomap->inline_data. Release the lock before returning from that path,\nwhereas the regular read path records base_ni in iomap->private and releases\nthe lock from its iomap_end() callback.\n\nTested with a reproducer that faults in a 16-byte resident file while\nanother thread runs link()/unlink() on it. Before: 40 KCSAN reports in\nabout one second. After: no reports in 180 seconds over 206,090 read\niterations and 423,540 link/unlink cycles. A PROVE_LOCKING build shows no\nlockdep splat with the same reproducer running for 60 seconds."}], "id": "CVE-2026-90131", "lastModified": "2026-09-17T17:17:05.617", "metrics": {}, "published": "2026-09-17T17:17:05.617", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0400e0d50eb3be19c98323faa322b652e4ae3f99"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d9e00c457d4ab8ab59c6e4b8554c921260e4e16c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{}