What is CVE-2026-46158?

CVE-2026-46158 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 5.10 onward and patched in 6.6.142, 6.12.92, 6.18.30 and others. CVE-2026-46158 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-46158?

CVE-2026-46158 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-2026-46158?

Yes, CVE-2026-46158 has been patched. Fixed versions include 6.6.142, 6.12.92, 6.18.30 and others. If you are running Linux kernel 5.10 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-46158 actively exploited?

CVE-2026-46158 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-46158

Medium

In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADD_ADDR rtx: always decrease sk refcount When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer(). It should then be released in all cases at the end. Some (unlikely) checks were returning directly instead of calling sock_put() to decrease the refcount. Jump to a new 'exit' label to call __sock_put() (which will become sock_put() in the next commit) to fix this potential leak. While at it, drop the '!msk' check which cannot happen because it is never reset, and explicitly mark the remaining one as "unlikely".

Package Linux Kernel

Published 2026-05-28

Last modified 2026-06-09

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

Affected versions

Linux kernel versions 5.10 and later are affected. Fixed in 6.6.142, 6.12.92, 6.18.30, 7.0.7, 7.1 and their respective stable series.

Affected from

≥ 5.10

Fixed in

✓ 6.6.142 6.6.x ✓ 6.12.92 6.12.x ✓ 6.18.30 6.18.x ✓ 7.0.7 7.0.x ✓ 7.1

References

5 total

Kernel Git
https://git.kernel.org/stable/c/25e37407442b8766ec2cf52fb4e31b5c3d3aeeae

Patch
Kernel Git
https://git.kernel.org/stable/c/9426265e157dd77ec237c795901ed4dea6d69b5c

Patch
Kernel Git
https://git.kernel.org/stable/c/9634cb35af17019baec21ca648516ce376fa10e6

Patch
Kernel Git
https://git.kernel.org/stable/c/acd3d3562315c99f3c0db16f0fcc5f0306638982

Patch
Kernel Git
https://git.kernel.org/stable/c/b41dd76f3b9735096c21d3e799a2b9fe36498d57

Patch

Details

CVE ID CVE-2026-46158

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-05-28

Modified 2026-06-09

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-46158?

CVE-2026-46158 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.10 onward and has been patched in 6.6.142, 6.12.92, 6.18.30 and others. CVE-2026-46158 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-46158?

CVE-2026-46158 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-2026-46158?

Yes. CVE-2026-46158 has been patched. Fixed versions include 6.6.142, 6.12.92, 6.18.30 and others. If you are running Linux kernel 5.10 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-46158 actively exploited?

No. CVE-2026-46158 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.