CVE-2026-43255wifi: libertas: fix WARNING in usb_tx_block
- 5.5MediumCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 5 days later
· 5 days later
Published
- 6 months later
· 6 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 – < 498525d8358d6d20918787e59736d5b6a021e9fd
- affected 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 – < 2902a9b4415a6bafc9b1e5dd360f065d757a0bb7
- affected 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 – < 948a39c95d0f8d73722910f8cdb7b6e3e9206232
- affected 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 – < 5bfb25495e391a1be0db94b15715174fa06b93a1
- affected 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 – < b82073564373e68c6ae3a96039fae14cd002a496
- affected 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 – < 3308c7504e093b22e91a4468470309cee2e26b83
- affected 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 – < fc188b44547dea4e7350833171982a6312befde9
- affected 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 – < d66676e6ca96bf8680f869a9bd6573b26c634622
- affected 2.6.22
- unaffected < 2.6.22
- unaffected 5.10.252 – ≤ 5.10.*
- unaffected 5.15.202 – ≤ 5.15.*
- unaffected 6.1.165 – ≤ 6.1.*
- unaffected 6.6.128 – ≤ 6.6.*
- unaffected 6.12.75 – ≤ 6.12.*
- unaffected 6.18.16 – ≤ 6.18.*
- unaffected 6.19.6 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References8
- https://git.kernel.org/stable/c/498525d8358d6d20918787e59736d5b6a021e9fd (opens in a new tab)
- https://git.kernel.org/stable/c/2902a9b4415a6bafc9b1e5dd360f065d757a0bb7 (opens in a new tab)
- https://git.kernel.org/stable/c/948a39c95d0f8d73722910f8cdb7b6e3e9206232 (opens in a new tab)
- https://git.kernel.org/stable/c/5bfb25495e391a1be0db94b15715174fa06b93a1 (opens in a new tab)
- https://git.kernel.org/stable/c/b82073564373e68c6ae3a96039fae14cd002a496 (opens in a new tab)
- https://git.kernel.org/stable/c/3308c7504e093b22e91a4468470309cee2e26b83 (opens in a new tab)
- https://git.kernel.org/stable/c/fc188b44547dea4e7350833171982a6312befde9 (opens in a new tab)
- https://git.kernel.org/stable/c/d66676e6ca96bf8680f869a9bd6573b26c634622 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-27814 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-43255)Record last updated .