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7.8 High

CVE-2026-31449 In the Linux kernel, the following vulnerability has been resolved: ext4: validate p_idx bounds in…

Description

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.

Affected products and versions

Product Affected versions Fixed in
Linux 7.0 earliest → < 7.0 7.0
Linux 6.19 earliest → < 6.19.11 6.19.11
Linux 6.18 earliest → < 6.18.21 6.18.21
Linux 6.12 earliest → < 6.12.80 6.12.80
Linux 6.6 earliest → < 6.6.140 6.6.140
Linux 6.1 earliest → < 6.1.175 6.1.175
Linux 5.15 earliest → < 5.15.210 5.15.210
Linux 5.10 earliest → < 5.10.259 5.10.259
Linux 2.6.19 No fix stated
Show the 4 other branches
Product Affected versions Fixed in
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP 3.1 3.1.7 → latest No fix stated
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 3.1 3.1.7 → latest No fix stated
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP 3.1 3.1.7 → latest No fix stated
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Versions not published

References

Timeline

  1. Published
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