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CVE-2026-31484

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: io_uring/fdinfo: fix OOB read in SQE_MIXED wrap check __io_uring_show_fdinfo() iterates over pending SQEs and, for 128-byte SQE…

Published Apr 22, 2026CWE-125EPSS 0.16%

Overview

CVE-2026-31484 is a high-severity vulnerability. It was published on April 22, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

io_uring/fdinfo: fix OOB read in SQE_MIXED wrap check

__io_uring_show_fdinfo() iterates over pending SQEs and, for 128-byte

SQEs on an IORING_SETUP_SQE_MIXED ring, needs to detect when the second

half of the SQE would be past the end of the sq_sqes array. The current

check tests (++sq_head & sq_mask) == 0, but sq_head is only incremented

when a 128-byte SQE is encountered, not on every iteration. The actual

array index is sq_idx = (i + sq_head) & sq_mask, which can be sq_mask

(the last slot) while the wrap check passes.

Fix by checking sq_idx directly. Keep the sq_head increment so the loop

still skips the second half of the 128-byte SQE on the next iteration.

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/5170efd9c344c68a8075dcb8ed38d3f8a60e7ed4Refgit.kernel.org/stable/c/ba21ab247a5be5382da7464b95afbe5f0e9aa503

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31484?

CVE-2026-31484 is a high-severity vulnerability. It was published on April 22, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-31484?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-31484?

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-2026-31484?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31484 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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