Medium 5.5Published May 6, 2026

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

Updated under an hour ago (Oct 26, 2026, 9:50 PM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 before 498525d8358d6d20918787e59736d5b6a021e9fd; from 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 before 2902a9b4415a6bafc9b1e5dd360f065d757a0bb7; from 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 before 948a39c95d0f8d73722910f8cdb7b6e3e9206232; 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 builds before 5bfb25495e391a1be0db94b15715174fa06b93a1; from 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 before b82073564373e68c6ae3a96039fae14cd002a496; from 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 before 3308c7504e093b22e91a4468470309cee2e26b83; from 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 before fc188b44547dea4e7350833171982a6312befde9; from 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 before d66676e6ca96bf8680f869a9bd6573b26c634622	CNA record
linux linux_kernel linux: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; from 6.19 before 6.19.6	NVD

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.