CVE-2026-31449
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
13cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 12 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=2.6.19.1,<6.12.80
- cpe:2.3:o:linux:linux_kernel:2.6.19:-:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.19:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.19:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.19:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.19:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:2.6.19:rc6:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
- (no CPE)
Patches
Vulnerability mechanics
References
6- git.kernel.org/stable/c/01bf1e0b997d82c0e353b51ed74ef99698043c33nvdPatch
- git.kernel.org/stable/c/2acb5c12ebd860f30e4faf67e6cc8c44ddfe5fe8nvdPatch
- git.kernel.org/stable/c/407c944f217c17d4343148011acafebc604d55e1nvdPatch
- git.kernel.org/stable/c/93f2e975ed658ce09db4d4c2877ca2c06540df83nvdPatch
- git.kernel.org/stable/c/10242e640b36b91ad03d25f3dc77854bbdff8358nvd
- git.kernel.org/stable/c/4d08401aa13f1531216f1a7ae281ca4806e90a5cnvd
News mentions
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