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CVE-2026-31449

7.8 · HIGH

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 en…

Published Apr 22, 2026CWE-125EPSS 0.15%

Overview

CVE-2026-31449 is a high-severity vulnerability. It was published on April 22, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/01bf1e0b997d82c0e353b51ed74ef99698043c33Refgit.kernel.org/stable/c/10242e640b36b91ad03d25f3dc77854bbdff8358Refgit.kernel.org/stable/c/2acb5c12ebd860f30e4faf67e6cc8c44ddfe5fe8Refgit.kernel.org/stable/c/39d6e2b67651614bac0dc6592fa9836321910067Refgit.kernel.org/stable/c/407c944f217c17d4343148011acafebc604d55e1Refgit.kernel.org/stable/c/4d08401aa13f1531216f1a7ae281ca4806e90a5cRefgit.kernel.org/stable/c/93f2e975ed658ce09db4d4c2877ca2c06540df83Refgit.kernel.org/stable/c/c5839b34704c9c2f47f079451bdbb22de0da1ed1

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31449?

CVE-2026-31449 is a high-severity vulnerability. It was published on April 22, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-31449?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-31449?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-31449?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31449 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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