CVE-2026-31449
7.8 HIGHIn the Linux kernel, the following vulnerability has been resolved: ext4: validate p_idx bounds in ext4_ext_correct_indexes ext4_ext_co...
Published: 2026-04-22 · Last updated: 2026-06-01
Severity and scoring
- CVSS
- 7.8 HIGH
- Vector
- CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CWE
- CWE-125
Affected products
| Vendor | Product |
|---|---|
| linux | linux_kernel |
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.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-31449
- [Patch]https://git.kernel.org/stable/c/01bf1e0b997d82c0e353b51ed74ef99698043c33
- [Other]https://git.kernel.org/stable/c/10242e640b36b91ad03d25f3dc77854bbdff8358
- [Patch]https://git.kernel.org/stable/c/2acb5c12ebd860f30e4faf67e6cc8c44ddfe5fe8
- [Patch]https://git.kernel.org/stable/c/407c944f217c17d4343148011acafebc604d55e1
- [Other]https://git.kernel.org/stable/c/4d08401aa13f1531216f1a7ae281ca4806e90a5c
- [Patch]https://git.kernel.org/stable/c/93f2e975ed658ce09db4d4c2877ca2c06540df83
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