{"id":"CVE-2026-64532","title":"fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}\n\nIn do_action()'s UpdateRecordDataRoot (fslog.c:3489) and\nUpdateRecordDataAllocation (fslog.c…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < b20e5a709d8bd190d6e4645606763c7423e694c1","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < d41b382068ca4e64e421f736cdd700095464b6ac","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 429d653ca641d38a78609b8f62e81a0a5c780a2d","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 315d3a9a48b49f889da3d858a9307e677cb9e1bd","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < be306b8d9143a9c076c804a7ca025d69caf9c448","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 36feda687afebae24c472202694448738809c411","Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 3e127829e57f5190f612412ece4541cb96d5ec7a","Linux 5.15"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:41:49.104430Z"},"published":"2026-07-27","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:42:40.032Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64532","references":[{"url":"https://git.kernel.org/stable/c/b20e5a709d8bd190d6e4645606763c7423e694c1"},{"url":"https://git.kernel.org/stable/c/d41b382068ca4e64e421f736cdd700095464b6ac"},{"url":"https://git.kernel.org/stable/c/429d653ca641d38a78609b8f62e81a0a5c780a2d"},{"url":"https://git.kernel.org/stable/c/315d3a9a48b49f889da3d858a9307e677cb9e1bd"},{"url":"https://git.kernel.org/stable/c/be306b8d9143a9c076c804a7ca025d69caf9c448"},{"url":"https://git.kernel.org/stable/c/36feda687afebae24c472202694448738809c411"},{"url":"https://git.kernel.org/stable/c/3e127829e57f5190f612412ece4541cb96d5ec7a"}],"tags":["cve.org"],"epss":0.00128,"epssPercentile":0.02193,"ingestedAt":"2026-10-16T17:24:46.826Z","slug":"CVE-2026-64532","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}\n\nIn do_action()'s UpdateRecordDataRoot (fslog.c:3489) and\nUpdateRecordDataAllocation (fslog.c:3697) cases, the memmove\ndestination is `Add2Ptr(e, le16_to_cpu(e->view.data_off))`,\nwhere e->view.data_off comes from an on-disk NTFS_DE inside\nan INDEX_ROOT or INDEX_BUFFER.  Neither case validates\nview.data_off + dlen against e->size; the existing\ncheck_if_index_root / check_if_alloc_index helpers walk the\nentry chain and validate the entry's offset, but not its\ninternal view fields.\n\nThe neighbouring read sites (e.g., fs/ntfs3/index.c when\niterating view entries) check view.data_off + view.data_size\n<= e->size.  Apply the same bound at the two memmove sites.\n\nReproduced under UML+KASAN on mainline 8d90b09e6741 via\npr_warn-only probe instrumentation: with view.data_off forced\nto 0xFFFC, the memmove writes 32 bytes past the end of the\nNTFS_DE.\n\nThis is similar in shape to Pavitra Jha's 2026-05-02 patch\n\"fs/ntfs3: prevent oob in case UpdateRecordDataRoot\"\n(<20260502105008.21827-1-jhapavitra98@gmail.com>) which\nproposes calling ntfs3_bad_de_range(); that helper does not\nexist in mainline.  This patch uses inline checks.\n\n## Affected\n\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < b20e5a709d8bd190d6e4645606763c7423e694c1`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < d41b382068ca4e64e421f736cdd700095464b6ac`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 429d653ca641d38a78609b8f62e81a0a5c780a2d`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 315d3a9a48b49f889da3d858a9307e677cb9e1bd`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < be306b8d9143a9c076c804a7ca025d69caf9c448`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 36feda687afebae24c472202694448738809c411`\n- `Linux >= b46acd6a6a627d876898e1c84d3f84902264b445 < 3e127829e57f5190f612412ece4541cb96d5ec7a`\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":[]}