What is CVE-2026-31413?

CVE-2026-31413 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Out-of-bounds Read flaw (CWE-125), affecting Linux kernel versions from 6.12.75 onward and patched in 6.12.80, 6.18.21 and 6.19.11. CVE-2026-31413 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-31413?

CVE-2026-31413 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-31413?

Yes, CVE-2026-31413 has been patched. Fixed versions include 6.12.80, 6.18.21 and 6.19.11. If you are running Linux kernel 6.12.75 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-31413 actively exploited?

CVE-2026-31413 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Read (CWE-125)?

The product reads data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/125.html

CVE-2026-31413

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 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.

Package Linux Kernel

Published 2026-04-12

Last modified 2026-05-20

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness type

CWE-125

CVE-2026-31413 is a Out-of-bounds Read vulnerability

What is Out-of-bounds Read?

The product reads data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.12.75, 6.18.16, 6.19.6 and later are affected. Fixed in 6.12.80, 6.18.21, 6.19.11 and their respective stable series.

Affected from

≥ 6.12.75 ≥ 6.18.16 ≥ 6.19.6

Fixed in

✓ 6.12.80 6.12.x ✓ 6.18.21 6.18.x ✓ 6.19.11 6.19.x

References

4 total

Kernel Git
https://git.kernel.org/stable/c/342aa1ee995ef5bbf876096dc3a5e51218d76fa4

Patch
Kernel Git
https://git.kernel.org/stable/c/58bd87d0e69204dbd739e4387a1edb0c4b1644e7

Patch
Kernel Git
https://git.kernel.org/stable/c/c845894ebd6fb43226b3118d6b017942550910c5

Patch
Kernel Git
https://git.kernel.org/stable/c/d13281ae7ea8902b21d99d10a2c8caf0bdec0455

Patch

Details

CVE ID CVE-2026-31413

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2026-04-12

Modified 2026-05-20

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-31413?

CVE-2026-31413 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Out-of-bounds Read flaw (CWE-125) . It affects Linux kernel versions from 6.12.75 onward and has been patched in 6.12.80, 6.18.21 and 6.19.11. CVE-2026-31413 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-31413?

CVE-2026-31413 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-31413?

Yes. CVE-2026-31413 has been patched. Fixed versions include 6.12.80, 6.18.21 and 6.19.11. If you are running Linux kernel 6.12.75 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-31413 actively exploited?

No. CVE-2026-31413 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.