What is CVE-2026-43155?

CVE-2026-43155 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Memory Leak flaw (CWE-401), affecting Linux kernel versions from 6.16 onward and patched in 6.18.16, 6.19.6 and 7.0. CVE-2026-43155 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-43155?

CVE-2026-43155 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-2026-43155?

Yes, CVE-2026-43155 has been patched. Fixed versions include 6.18.16, 6.19.6 and 7.0. If you are running Linux kernel 6.16 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-43155 actively exploited?

CVE-2026-43155 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Memory Leak (CWE-401)?

The product does not release memory after use, causing gradual resource exhaustion. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/401.html

CVE-2026-43155

Medium

In the Linux kernel, the following vulnerability has been resolved: mux: mmio: fix regmap leak on probe failure The mmio regmap that may be allocated during probe is never freed. Switch to using the device managed allocator so that the regmap is released on probe failures (e.g. probe deferral) and on driver unbind.

Package Linux Kernel

Published 2026-05-06

Last modified 2026-05-13

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-401

CVE-2026-43155 is a Memory Leak vulnerability

What is Memory Leak?

The product does not release memory after use, causing gradual resource exhaustion. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.16 and later are affected. Fixed in 6.18.16, 6.19.6, 7.0 and their respective stable series.

Affected from

≥ 6.16

Fixed in

✓ 6.18.16 6.18.x ✓ 6.19.6 6.19.x ✓ 7.0

References

The following references provide additional information about CVE-2026-43155 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/3c4ae63073d84abee5d81ce46d86a94e9dae9c89
Patch
Kernel patch commit
https://git.kernel.org/stable/c/76096f156fe9dc9fbd6e4618088706e91b9b0a6c
Patch
Kernel patch commit
https://git.kernel.org/stable/c/cbde3c109d52564ae2c12e514c33c44345e84b2c
Patch

Details

CVE ID CVE-2026-43155

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-05-06

Modified 2026-05-13

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-43155?

CVE-2026-43155 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a Memory Leak flaw (CWE-401) . It affects Linux kernel versions from 6.16 onward and has been patched in 6.18.16, 6.19.6 and 7.0. CVE-2026-43155 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-43155?

CVE-2026-43155 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-2026-43155?

Yes — CVE-2026-43155 has been patched. Fixed versions include 6.18.16, 6.19.6 and 7.0. If you are running Linux kernel 6.16 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-43155 actively exploited?

No — CVE-2026-43155 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Memory Leak (CWE-401)?

The product does not release memory after use, causing gradual resource exhaustion. View CWE-401 on MITRE CWE →