HOMEVULNERABILITIESCVE-2026-43255
MEDIUM

CVE-2026-43255

Published: May 6, 2026· Updated: May 11, 2026

5.5
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:7.0th

Official 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.

NVD Source

Technical Analysis

CVE-2026-43255 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Linux1 product
linux kernel
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

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

All References (8)

→
https://git.kernel.org/stable/c/2902a9b4415a6bafc9b1e5dd360f065d757a0bb7Patch
→
https://git.kernel.org/stable/c/3308c7504e093b22e91a4468470309cee2e26b83Patch
→
https://git.kernel.org/stable/c/498525d8358d6d20918787e59736d5b6a021e9fdPatch
→
https://git.kernel.org/stable/c/5bfb25495e391a1be0db94b15715174fa06b93a1Patch
→
https://git.kernel.org/stable/c/948a39c95d0f8d73722910f8cdb7b6e3e9206232Patch
→
https://git.kernel.org/stable/c/b82073564373e68c6ae3a96039fae14cd002a496Patch
→
https://git.kernel.org/stable/c/d66676e6ca96bf8680f869a9bd6573b26c634622Patch
→
https://git.kernel.org/stable/c/fc188b44547dea4e7350833171982a6312befde9Patch

Quick Facts

CVE IDCVE-2026-43255
CVSS Score5.5 / 10
SeverityMEDIUM
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedMay 6, 2026

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-43255 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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