What is CVE-2026-43341?

CVE-2026-43341 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10, affecting Linux kernel versions from 5.15 onward and patched in 5.15.210, 6.1.168, 6.6.134 and others. CVE-2026-43341 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-43341?

CVE-2026-43341 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-2026-43341?

Yes, CVE-2026-43341 has been patched. Fixed versions include 5.15.210, 6.1.168, 6.6.134 and others. If you are running Linux kernel 5.15 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-43341 actively exploited?

CVE-2026-43341 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-43341

Critical

In the Linux kernel, the following vulnerability has been resolved: net/ipv6: ioam6: prevent schema length wraparound in trace fill ioam6_fill_trace_data() stores the schema contribution to the trace length in a u8. With bit 22 enabled and the largest schema payload, sclen becomes 1 + 1020 / 4, wraps from 256 to 0, and bypasses the remaining-space check. __ioam6_fill_trace_data() then positions the write cursor without reserving the schema area but still copies the 4-byte schema header and the full schema payload, overrunning the trace buffer. Keep sclen in an unsigned int so the remaining-space check and the write cursor calculation both see the full schema length.

Package Linux Kernel

Published 2026-05-08

Last modified 2026-06-19

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 5.15 and later are affected. Fixed in 5.15.210, 6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12, 7.0 and their respective stable series.

Affected from

≥ 5.15

Fixed in

✓ 5.15.210 5.15.x ✓ 6.1.168 6.1.x ✓ 6.6.134 6.6.x ✓ 6.12.81 6.12.x ✓ 6.18.22 6.18.x ✓ 6.19.12 6.19.x ✓ 7.0

References

7 total

Kernel Git
https://git.kernel.org/stable/c/184d2e9db27c0f76226b5cad16fe29510a5d2280

Patch
Kernel Git
https://git.kernel.org/stable/c/5e67ba9bb531e1ec6599a82a065dea9040b9ce50

Patch
Kernel Git
https://git.kernel.org/stable/c/77695a69baca9b99d95fad09fc78c2318736604f

Patch
Kernel Git
https://git.kernel.org/stable/c/d1b041080086e91d3733a5438a8c51ad5d3d8e09

Patch
Kernel Git
https://git.kernel.org/stable/c/d6e1c9b02d85a4f1f4ba6d68e916d9b610a3ed7d

Patch

Showing 5 of 7 references View all on NVD

Details

CVE ID CVE-2026-43341

Severity Critical

CVSS score 9.8 / 10

CVSS version 3.1

Published 2026-05-08

Modified 2026-06-19

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-43341?

CVE-2026-43341 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10 . It affects Linux kernel versions from 5.15 onward and has been patched in 5.15.210, 6.1.168, 6.6.134 and others. CVE-2026-43341 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-43341?

CVE-2026-43341 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-2026-43341?

Yes. CVE-2026-43341 has been patched. Fixed versions include 5.15.210, 6.1.168, 6.6.134 and others. If you are running Linux kernel 5.15 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-43341 actively exploited?

No. CVE-2026-43341 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.