What is CVE-2026-43125?

CVE-2026-43125 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10, classified as a Out-of-bounds Write flaw (CWE-787), affecting Linux kernel versions from 3.4 onward and patched in 6.12.75, 6.18.16, 6.19.6 and others. CVE-2026-43125 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-43125?

CVE-2026-43125 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-2026-43125?

Yes, CVE-2026-43125 has been patched. Fixed versions include 6.12.75, 6.18.16, 6.19.6 and others. If you are running Linux kernel 3.4 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-43125 actively exploited?

CVE-2026-43125 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Write (CWE-787)?

The product writes data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/787.html

CVE-2026-43125

Critical

In the Linux kernel, the following vulnerability has been resolved: dlm: validate length in dlm_search_rsb_tree The len parameter in dlm_dump_rsb_name() is not validated and comes from network messages. When it exceeds DLM_RESNAME_MAXLEN, it can cause out-of-bounds write in dlm_search_rsb_tree(). Add length validation to prevent potential buffer overflow.

Package Linux Kernel

Published 2026-05-06

Last modified 2026-07-20

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

Weakness type

CWE-787

CVE-2026-43125 is a Out-of-bounds Write vulnerability

What is Out-of-bounds Write?

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

Affected versions

Linux kernel versions 3.4 and later are affected. Fixed in 6.12.75, 6.18.16, 6.19.6, 7.0 and their respective stable series.

Affected from

≥ 3.4

Fixed in

✓ 6.12.75 6.12.x ✓ 6.18.16 6.18.x ✓ 6.19.6 6.19.x ✓ 7.0

References

18 total

Kernel Git
https://git.kernel.org/stable/c/080e5563f878c64e697b89e7439d730d0daad882

Patch
Kernel Git
https://git.kernel.org/stable/c/082083c9fbd99422a0370fe2102144a231c9f5d6

Patch
Kernel Git
https://git.kernel.org/stable/c/5f053a2e7209d326cbbc07738fa6d6893d307438

Patch
Kernel Git
https://git.kernel.org/stable/c/67288113c5e6cf9e659b4065c0ed6f16100e0c71

Patch
Red Hat
https://access.redhat.com/errata/RHSA-2026:25120

Showing 5 of 18 references View all on NVD

Details

CVE ID CVE-2026-43125

Severity Critical

CVSS score 9.8 / 10

CVSS version 3.1

Published 2026-05-06

Modified 2026-07-20

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-43125?

CVE-2026-43125 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10 , classified as an Out-of-bounds Write flaw (CWE-787) . It affects Linux kernel versions from 3.4 onward and has been patched in 6.12.75, 6.18.16, 6.19.6 and others. CVE-2026-43125 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-43125?

CVE-2026-43125 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-2026-43125?

Yes. CVE-2026-43125 has been patched. Fixed versions include 6.12.75, 6.18.16, 6.19.6 and others. If you are running Linux kernel 3.4 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-43125 actively exploited?

No. CVE-2026-43125 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.