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CVE-2026-31413

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix unsound scalar forking in maybe_fork_scalars() for BPF_OR maybe_fork_scalars() is called for both BPF_AND and BPF_OR w…

Published Apr 12, 2026CWE-125EPSS 0.18%

Overview

CVE-2026-31413 is a high-severity vulnerability. It was published on April 12, 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. Some level of privileges is required for exploitation.

Technical description

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

bpf: Fix unsound scalar forking in maybe_fork_scalars() for BPF_OR

maybe_fork_scalars() is called for both BPF_AND and BPF_OR when the

source operand is a constant. When dst has signed range [-1, 0], it

forks the verifier state: the pushed path gets dst = 0, the current

path gets dst = -1.

For BPF_AND this is correct: 0 & K == 0.

For BPF_OR this is wrong: 0 | K == K, not 0.

The pushed path therefore tracks dst as 0 when the runtime value is K,

producing an exploitable verifier/runtime divergence that allows

out-of-bounds map access.

Fix this by passing env->insn_idx (instead of env->insn_idx + 1) to

push_stack(), so the pushed path re-executes the ALU instruction with

dst = 0 and naturally computes the correct result for any opcode.

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/342aa1ee995ef5bbf876096dc3a5e51218d76fa4Refgit.kernel.org/stable/c/58bd87d0e69204dbd739e4387a1edb0c4b1644e7Refgit.kernel.org/stable/c/c845894ebd6fb43226b3118d6b017942550910c5Refgit.kernel.org/stable/c/d13281ae7ea8902b21d99d10a2c8caf0bdec0455

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31413?

CVE-2026-31413 is a high-severity vulnerability. It was published on April 12, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-31413?

This vulnerability has a CVSS 3.1 base score of 7.8, 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-2026-31413?

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-2026-31413?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31413 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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