What is CVE-2026-43134?

CVE-2026-43134 is a High severity Linux kernel vulnerability with a CVSS score of 8.1 out of 10, affecting Linux kernel versions from 3.14 onward and patched in 5.10.252, 5.15.202, 6.1.165 and others. CVE-2026-43134 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-43134?

CVE-2026-43134 has a CVSS score of 8.1 out of 10, rated High severity. The vector string is CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Is there a patch available for CVE-2026-43134?

Yes, CVE-2026-43134 has been patched. Fixed versions include 5.10.252, 5.15.202, 6.1.165 and others. If you are running Linux kernel 3.14 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-43134 actively exploited?

CVE-2026-43134 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-43134

High

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix missing key size check for L2CAP_LE_CONN_REQ This adds a check for encryption key size upon receiving L2CAP_LE_CONN_REQ which is required by L2CAP/LE/CFC/BV-15-C which expects L2CAP_CR_LE_BAD_KEY_SIZE.

Package Linux Kernel

Published 2026-05-06

Last modified 2026-05-12

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

8.1

out of 10

High

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Vector string

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

Affected versions

Linux kernel versions 3.14 and later are affected. Fixed in 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.16, 6.19.6, 7.0 and their respective stable series.

Affected from

≥ 3.14

Fixed in

✓ 5.10.252 5.10.x ✓ 5.15.202 5.15.x ✓ 6.1.165 6.1.x ✓ 6.6.128 6.6.x ✓ 6.12.75 6.12.x ✓ 6.18.16 6.18.x ✓ 6.19.6 6.19.x ✓ 7.0

References

The following references provide additional information about CVE-2026-43134 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/138d7eca445ef37a0333425d269ee59900ca1104
Patch
Kernel patch commit
https://git.kernel.org/stable/c/335071c0c3637064ec250481f589075db44fe4e6
Patch
Kernel patch commit
https://git.kernel.org/stable/c/481ea39b342c347b6ac029f3d418486280be4e45
Patch

8 patch commits total View all on NVD

Details

CVE ID CVE-2026-43134

Severity High

CVSS score 8.1 / 10

CVSS version 3.1

Published 2026-05-06

Modified 2026-05-12

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-43134?

CVE-2026-43134 is a High severity Linux kernel vulnerability with a CVSS score of 8.1 out of 10 . It affects Linux kernel versions from 3.14 onward and has been patched in 5.10.252, 5.15.202, 6.1.165 and others. CVE-2026-43134 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-43134?

CVE-2026-43134 has a CVSS score of 8.1 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
Is there a patch available for CVE-2026-43134?

Yes — CVE-2026-43134 has been patched. Fixed versions include 5.10.252, 5.15.202, 6.1.165 and others. If you are running Linux kernel 3.14 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-43134 actively exploited?

No — CVE-2026-43134 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.