CVE-2026-43255
wifi: libertas: fix WARNING in usb_tx_block
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.
INFO
Published Date :
May 6, 2026, 12:16 p.m.
Last Modified :
May 6, 2026, 1:07 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Ensure URB is idle by calling usb_kill_urb() before submission.
- Update the Linux kernel to the latest stable version.
- Apply the vendor-supplied patch for the libertas driver.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-43255.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-43255 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-43255
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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CVE-2026-43255 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-43255 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 06, 2026
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/2902a9b4415a6bafc9b1e5dd360f065d757a0bb7 Added Reference https://git.kernel.org/stable/c/3308c7504e093b22e91a4468470309cee2e26b83 Added Reference https://git.kernel.org/stable/c/498525d8358d6d20918787e59736d5b6a021e9fd Added Reference https://git.kernel.org/stable/c/5bfb25495e391a1be0db94b15715174fa06b93a1 Added Reference https://git.kernel.org/stable/c/948a39c95d0f8d73722910f8cdb7b6e3e9206232 Added Reference https://git.kernel.org/stable/c/b82073564373e68c6ae3a96039fae14cd002a496 Added Reference https://git.kernel.org/stable/c/d66676e6ca96bf8680f869a9bd6573b26c634622 Added Reference https://git.kernel.org/stable/c/fc188b44547dea4e7350833171982a6312befde9