What is CVE-2026-52931?

CVE-2026-52931 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10, affecting Linux kernel versions from 4.8 onward and patched in 5.10.258, 5.15.209, 6.1.175 and others. CVE-2026-52931 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-52931?

CVE-2026-52931 has a CVSS score of 9.8 out of 10, rated Critical severity. The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-52931?

Yes, CVE-2026-52931 has been patched. Fixed versions include 5.10.258, 5.15.209, 6.1.175 and others. If you are running Linux kernel 4.8 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-52931 actively exploited?

CVE-2026-52931 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-52931

Critical

In the Linux kernel, the following vulnerability has been resolved: batman-adv: tp_meter: avoid use of uninit sender vars batadv_tp_recv_ack() and batadv_tp_stop() are only valid for tp_vars in the BATADV_TP_SENDER role. When called with a BATADV_TP_RECEIVER role, it proceeds to read sender-only members that were never initialized, leading to undefined behavior. This can be triggered when a node that is currently acting as a receiver in an ongoing tp_meter session receives a malicious ACK packet. Guard against this by checking tp_vars->role immediately after the lookup and bailing out if it is not BATADV_TP_SENDER, before any of those members are accessed.

Package Linux Kernel

Published 2026-06-24

Last modified 2026-07-08

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

9.8

out of 10

Critical

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Affected versions

Linux kernel versions 4.8 and later are affected. Fixed in 5.10.258, 5.15.209, 6.1.175, 6.6.142, 6.12.92, 6.18.34, 7.0.11, 7.1 and their respective stable series.

Affected from

≥ 4.8

Fixed in

✓ 5.10.258 5.10.x ✓ 5.15.209 5.15.x ✓ 6.1.175 6.1.x ✓ 6.6.142 6.6.x ✓ 6.12.92 6.12.x ✓ 6.18.34 6.18.x ✓ 7.0.11 7.0.x ✓ 7.1

References

8 total

Kernel Git
https://git.kernel.org/stable/c/0e388af04b3958b178a1b979527f93eb46ea1fee

Patch
Kernel Git
https://git.kernel.org/stable/c/1a21c055f66e78973712a4a1be2a554f1ee2e4f4

Patch
Kernel Git
https://git.kernel.org/stable/c/53f931e0146ae5bdab4cba302646827d06b3794b

Patch
Kernel Git
https://git.kernel.org/stable/c/6c65cf23d4c6170fcf5714c32aa64689718cb142

Patch
Kernel Git
https://git.kernel.org/stable/c/85397e48afe6be83ffca5ad3f4792296bfc81d3d

Patch

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2026-52931

Severity Critical

CVSS score 9.8 / 10

CVSS version 3.1

Published 2026-06-24

Modified 2026-07-08

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-52931?

CVE-2026-52931 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10 . It affects Linux kernel versions from 4.8 onward and has been patched in 5.10.258, 5.15.209, 6.1.175 and others. CVE-2026-52931 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-52931?

CVE-2026-52931 has a CVSS score of 9.8 out of 10, rated Critical severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-52931?

Yes. CVE-2026-52931 has been patched. Fixed versions include 5.10.258, 5.15.209, 6.1.175 and others. If you are running Linux kernel 4.8 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-52931 actively exploited?

No. CVE-2026-52931 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.