What is CVE-2026-31621?

CVE-2026-31621 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 6.19 onward and patched in 6.19.14, 7.0.1 and 7.1-rc1. CVE-2026-31621 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-31621?

CVE-2026-31621 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2026-31621?

Yes, CVE-2026-31621 has been patched. Fixed versions include 6.19.14, 7.0.1 and 7.1-rc1. If you are running Linux kernel 6.19 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-31621 actively exploited?

CVE-2026-31621 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-31621

Medium

In the Linux kernel, the following vulnerability has been resolved: bnge: return after auxiliary_device_uninit() in error path When auxiliary_device_add() fails, the error block calls auxiliary_device_uninit() but does not return. The uninit drops the last reference and synchronously runs bnge_aux_dev_release(), which sets bd->auxr_dev = NULL and frees the underlying object. The subsequent bd->auxr_dev->net = bd->netdev then dereferences NULL, which is not a good thing to have happen when trying to clean up from an error. Add the missing return, as the auxiliary bus documentation states is a requirement (seems that LLM tools read documentation better than humans do...)

Package Linux Kernel

Published 2026-04-24

Last modified 2026-04-28

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-908

CVE-2026-31621 is classified as CWE-908

See CWE-908 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 6.19 and later are affected. Fixed in 6.19.14, 7.0.1, 7.1-rc1 and their respective stable series.

Affected from

≥ 6.19

Fixed in

✓ 6.19.14 6.19.x ✓ 7.0.1 7.0.x ✓ 7.1-rc1

References

The following references provide additional information about CVE-2026-31621 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/38c383ec6d37f4b5597f8e6a1f5c2ab31ea01d3a
Patch
Kernel patch commit
https://git.kernel.org/stable/c/87bc3557c708110d83086bf091328271298a44e3
Patch
Kernel patch commit
https://git.kernel.org/stable/c/8b0c25528cb64f71a73b5c0d49cbbcb68540a4ce
Patch

Details

CVE ID CVE-2026-31621

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-04-24

Modified 2026-04-28

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-31621?

CVE-2026-31621 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 6.19 onward and has been patched in 6.19.14, 7.0.1 and 7.1-rc1. CVE-2026-31621 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-31621?

CVE-2026-31621 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2026-31621?

Yes — CVE-2026-31621 has been patched. Fixed versions include 6.19.14, 7.0.1 and 7.1-rc1. If you are running Linux kernel 6.19 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-31621 actively exploited?

No — CVE-2026-31621 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.