Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2026-43255

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: wifi: libertas: fix WARNING in usb_tx_block The function usb_tx_block() submits cardp->tx_urb without ensuring that any previou…

Published May 6, 2026EPSS 0.16%

Overview

CVE-2026-43255 is a medium-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

wifi: libertas: fix WARNING in usb_tx_block

The function usb_tx_block() submits cardp->tx_urb without ensuring that

any previous transmission on this URB has completed. If a second call

occurs while the URB is still active (e.g. during rapid firmware loading),

usb_submit_urb() detects the active state and triggers a warning:

'URB submitted while active'.

Fix this by enforcing serialization: call usb_kill_urb() before

submitting the new request. This ensures the URB is idle and safe to reuse.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/2902a9b4415a6bafc9b1e5dd360f065d757a0bb7Refgit.kernel.org/stable/c/3308c7504e093b22e91a4468470309cee2e26b83Refgit.kernel.org/stable/c/498525d8358d6d20918787e59736d5b6a021e9fdRefgit.kernel.org/stable/c/5bfb25495e391a1be0db94b15715174fa06b93a1Refgit.kernel.org/stable/c/948a39c95d0f8d73722910f8cdb7b6e3e9206232Refgit.kernel.org/stable/c/b82073564373e68c6ae3a96039fae14cd002a496Refgit.kernel.org/stable/c/d66676e6ca96bf8680f869a9bd6573b26c634622Refgit.kernel.org/stable/c/fc188b44547dea4e7350833171982a6312befde9

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43255?

CVE-2026-43255 is a medium-severity vulnerability. It was published on May 6, 2026 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2026-43255?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43255?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-43255?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43255 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related MEDIUM CVEs from 2026

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999