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CVE-2026-64532

fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, and 1 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation} In do_action()'s UpdateRecordDataRoot (fslog.c:3489) and UpdateRecordDataAllocation (fslog.c:3697) cases, the memmove destination is `Add2Ptr(e, le16_to_cpu(e->view.data_off))`, where e->view.data_off comes from an on-disk NTFS_DE inside an INDEX_ROOT or INDEX_BUFFER. Neither case validates view.data_off + dlen against e->size; the existing check_if_index_root / check_if_alloc_index helpers walk the entry chain and validate the entry's offset, but not its internal view fields. The neighbouring read sites (e.g., fs/ntfs3/index.c when iterating view entries) check view.data_off + view.data_size <= e->size. Apply the same bound at the two memmove sites. Reproduced under UML+KASAN on mainline 8d90b09e6741 via pr_warn-only probe instrumentation: with view.data_off forced to 0xFFFC, the memmove writes 32 bytes past the end of the NTFS_DE. This is similar in shape to Pavitra Jha's 2026-05-02 patch "fs/ntfs3: prevent oob in case UpdateRecordDataRoot" (<20260502105008.21827-1-jhapavitra98@gmail.com>) which proposes calling ntfs3_bad_de_range(); that helper does not exist in mainline. This patch uses inline checks.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in b20e5a709d8bd190d6e4645606763c7423e694c1; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in d41b382068ca4e64e421f736cdd700095464b6ac; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in 429d653ca641d38a78609b8f62e81a0a5c780a2d; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in 315d3a9a48b49f889da3d858a9307e677cb9e1bd; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in be306b8d9143a9c076c804a7ca025d69caf9c448; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in 36feda687afebae24c472202694448738809c411; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in 3e127829e57f5190f612412ece4541cb96d5ec7a

  • Linux Linux

    5.15

  • KernelLinux

    From 5.15.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 7

git.kernel.org