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CVE-2026-43255: wifi: libertas: fix WARNING in usb_tx_block

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-06 · updated 2026-06-17

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.

Affected products

• Linux kernel: from 2.6.22 before 5.10.252; from 5.11 before 5.15.202; from 5.16 before 6.1.165; from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.16 — fixed in 5.10.252, 5.15.202, 6.1.165, 6.12.75, 6.18.16, 6.19.6

How to fix

Upgrade to a fixed version: Linux kernel 5.10.252, 5.15.202, 6.1.165, 6.12.75. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2902a9b4415a6bafc9b1e5dd360f065d757a0bb7
• https://git.kernel.org/stable/c/3308c7504e093b22e91a4468470309cee2e26b83
• https://git.kernel.org/stable/c/498525d8358d6d20918787e59736d5b6a021e9fd
• https://git.kernel.org/stable/c/5bfb25495e391a1be0db94b15715174fa06b93a1
• https://git.kernel.org/stable/c/948a39c95d0f8d73722910f8cdb7b6e3e9206232
• https://git.kernel.org/stable/c/b82073564373e68c6ae3a96039fae14cd002a496
• https://git.kernel.org/stable/c/d66676e6ca96bf8680f869a9bd6573b26c634622
• https://git.kernel.org/stable/c/fc188b44547dea4e7350833171982a6312befde9

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