What is CVE-2026-43261?

CVE-2026-43261 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 5.10.105 onward and patched in 5.10.252, 5.15.202, 6.1.165 and others. CVE-2026-43261 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-43261?

CVE-2026-43261 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-2026-43261?

Yes, CVE-2026-43261 has been patched. Fixed versions include 5.10.252, 5.15.202, 6.1.165 and others. If you are running Linux kernel 5.10.105 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-43261 actively exploited?

CVE-2026-43261 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-43261

Medium

In the Linux kernel, the following vulnerability has been resolved: arm64: Add support for TSV110 Spectre-BHB mitigation The TSV110 processor is vulnerable to the Spectre-BHB (Branch History Buffer) attack, which can be exploited to leak information through branch prediction side channels. This commit adds the MIDR of TSV110 to the list for software mitigation.

Package Linux Kernel

Published 2026-05-06

Last modified 2026-05-08

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 5.10.105, 5.15.28, 4.9.310, 4.14.275, 4.19.236, 5.4.186, 5.16.14, 5.17 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

≥ 5.10.105 ≥ 5.15.28 ≥ 4.9.310 ≥ 4.14.275 ≥ 4.19.236 ≥ 5.4.186 ≥ 5.16.14 ≥ 5.17

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-2026-43261 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/598c11dd4f4a9de31d854fcb9702f54c1c70f0d0
Patch
Kernel patch commit
https://git.kernel.org/stable/c/5dbe1f14359735fa50ba0dd4a496125b5bc7f422
Patch
Kernel patch commit
https://git.kernel.org/stable/c/a8d0ad5d990b050a6db74218a34b5529085e16b8
Patch

8 patch commits total View all on NVD

Details

CVE ID CVE-2026-43261

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-05-06

Modified 2026-05-08

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-43261?

CVE-2026-43261 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 5.10.105 onward and has been patched in 5.10.252, 5.15.202, 6.1.165 and others. CVE-2026-43261 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-43261?

CVE-2026-43261 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-2026-43261?

Yes — CVE-2026-43261 has been patched. Fixed versions include 5.10.252, 5.15.202, 6.1.165 and others. If you are running Linux kernel 5.10.105 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-43261 actively exploited?

No — CVE-2026-43261 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.