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CVE-2026-89617

fs/ntfs3: validate dirty page table on log replay

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.221, 6.1.188, 6.6.157, 6.12.109, 6.18.50, and 1 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: fs/ntfs3: validate dirty page table on log replay Each DIR_PAGE_ENTRY ends in a page_lcns[] array whose length is the on-disk lcns_follow field. check_rstbl() validates the table bookkeeping but never checks that this array fits in the entry, so a crafted lcns_follow lets the v0->v1 conversion memmove and later replay passes run off the entry. Add check_dp_table() to reject, right after check_rstbl(), any entry larger than its size claims via struct_size() (the same expression used to allocate these entries, so the check is overflow-safe by construction). All consumers can then trust lcns_follow as the real capacity. This covers every page_lcns[] access whose index is bounded by the entry itself (the conversion memmove, the HotFix store via find_dp(), and the self-bounded scan loops). Accesses whose index comes from the log record need a separate bound and are handled in a follow-up patch.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in 0e07ea2fc45a7b4757ef7bf1f692cc0180a08323; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in 1e90b1703ee1a04cd3e9e399353fc536f5f3ba10; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in d23155634a4bc1183e761d5eb2c043b2e693cc98; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in 1200c2779c43b62656ccbb67df9468a7a9af2484; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in 2d94ffc9d7b5bb3517b129fe63b52d84bcd4ae56; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in 0908da07c23be4f94b99dfd9a94765525f0fe4bd; From b46acd6a6a627d876898e1c84d3f84902264b445 · fixed in 006cb7713dec10368e699abc4367e5faa334c9a5

  • Linux Linux

    5.15

  • KernelLinux

    From 5.15.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.109; From 6.13.0 · fixed in 6.18.50; From 6.19.0 · fixed in 7.2.4

References 7

git.kernel.org