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CVE-2026-31449

ext4: validate p_idx bounds in ext4_ext_correct_indexes

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.259, 5.15.210, 6.1.175, 6.6.140, 6.12.80, and 2 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: ext4: validate p_idx bounds in ext4_ext_correct_indexes ext4_ext_correct_indexes() walks up the extent tree correcting index entries when the first extent in a leaf is modified. Before accessing path[k].p_idx->ei_block, there is no validation that p_idx falls within the valid range of index entries for that level. If the on-disk extent header contains a corrupted or crafted eh_entries value, p_idx can point past the end of the allocated buffer, causing a slab-out-of-bounds read. Fix this by validating path[k].p_idx against EXT_LAST_INDEX() at both access sites: before the while loop and inside it. Return -EFSCORRUPTED if the index pointer is out of range, consistent with how other bounds violations are handled in the ext4 extent tree code.

Timeline

  1. CVE published
  2. CISA SSVC assessment

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

  3. Record last updated

Affected versions

  • Linux Linux

    From a86c61812637c7dd0c57e29880cffd477b62f2e7 · fixed in 39d6e2b67651614bac0dc6592fa9836321910067; From a86c61812637c7dd0c57e29880cffd477b62f2e7 · fixed in c5839b34704c9c2f47f079451bdbb22de0da1ed1; From a86c61812637c7dd0c57e29880cffd477b62f2e7 · fixed in 10242e640b36b91ad03d25f3dc77854bbdff8358; From a86c61812637c7dd0c57e29880cffd477b62f2e7 · fixed in 4d08401aa13f1531216f1a7ae281ca4806e90a5c; From a86c61812637c7dd0c57e29880cffd477b62f2e7 · fixed in 407c944f217c17d4343148011acafebc604d55e1; From a86c61812637c7dd0c57e29880cffd477b62f2e7 · fixed in 93f2e975ed658ce09db4d4c2877ca2c06540df83; From a86c61812637c7dd0c57e29880cffd477b62f2e7 · fixed in 01bf1e0b997d82c0e353b51ed74ef99698043c33; From a86c61812637c7dd0c57e29880cffd477b62f2e7 · fixed in 2acb5c12ebd860f30e4faf67e6cc8c44ddfe5fe8

  • Linux Linux

    2.6.19

  • KernelLinux

    From 2.6.19 · fixed in 5.10.259; From 5.11.0 · fixed in 5.15.210; From 5.16.0 · fixed in 6.1.175; From 6.2.0 · fixed in 6.6.140; From 6.7.0 · fixed in 6.12.80; From 6.13.0 · fixed in 6.18.21; From 6.19.0 · fixed in 6.19.11

References 8

git.kernel.org