Is CVE-2026-43255 in the CISA KEV catalog?

No. CVE-2026-43255 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-43255?

CVE-2026-43255 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2026-43255?

CVE-2026-43255 has an EPSS score of 0.13% (3th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-43255?

Upgrade linux on debian 11 to 5.10.257-1 or later. Fixes are available for 125 affected products.

CVE & CISA-KEV Catalog

CVE-2026-43255

MEDIUM

5.5

CVSS v3

NVD

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.

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.257-1CVE-2026-43255

Fixed in:6.1.170-1CVE-2026-43255

Fixed in:6.12.85-1CVE-2026-43255

Fixed in:6.19.6-1CVE-2026-43255

linuxUbuntu

Fixed in:6.8.0-134.134USN-8492-1

linux-awsUbuntu

Fixed in:6.8.0-1060.63USN-8492-1

linux-aws-6.8Ubuntu

Fixed in:6.8.0-1060.63~22.04.1USN-8492-2

linux-aws-fipsUbuntu

Fixed in:6.8.0-1060.63+fips1USN-8492-1

linux-gcpUbuntu

Fixed in:6.8.0-1063.69USN-8492-1

linux-gcp-6.8Ubuntu

Fixed in:6.8.0-1063.69~22.04.1USN-8492-2

linux-gcp-fipsUbuntu

Fixed in:6.8.0-1063.69+fips1USN-8492-1

linux-gkeUbuntu

Fixed in:6.8.0-1058.64USN-8492-2

linux-gkeopUbuntu

Fixed in:6.8.0-1045.48USN-8492-2

linux-ibmUbuntu

Fixed in:6.8.0-1060.61USN-8492-1

linux-ibm-6.8Ubuntu

Fixed in:6.8.0-1060.61~22.04.1USN-8492-2

linux-image-6.8.0-1029-nvidia-tegraUbuntu

Fixed in:6.8.0-1029.30USN-8498-1

linux-image-6.8.0-1029-nvidia-tegra-rtUbuntu

Fixed in:6.8.0-1029.30USN-8498-1

linux-image-6.8.0-1032-xilinxUbuntu

Fixed in:6.8.0-1032.33USN-8499-1

linux-image-6.8.0-1045-gkeopUbuntu

Fixed in:6.8.0-1045.48USN-8492-2

linux-image-6.8.0-1057-oracleUbuntu

Fixed in:6.8.0-1057.58~22.04.1USN-8492-2

Fixed in:6.8.0-1057.58USN-8492-1

linux-image-6.8.0-1057-oracle-64kUbuntu

Fixed in:6.8.0-1057.58~22.04.1USN-8492-2

Fixed in:6.8.0-1057.58USN-8492-1

linux-image-6.8.0-1058-gkeUbuntu

Fixed in:6.8.0-1058.64USN-8492-2

linux-image-6.8.0-1058-gke-64kUbuntu

Fixed in:6.8.0-1058.64USN-8492-2

linux-image-6.8.0-1058-nvidiaUbuntu

Fixed in:6.8.0-1058.61~22.04.1USN-8492-1

Fixed in:6.8.0-1058.61USN-8492-1

linux-image-6.8.0-1058-nvidia-64kUbuntu

Fixed in:6.8.0-1058.61~22.04.1USN-8492-1

Fixed in:6.8.0-1058.61USN-8492-1

linux-image-6.8.0-1058-nvidia-lowlatencyUbuntu

Fixed in:6.8.0-1058.61.1USN-8492-2

linux-image-6.8.0-1058-nvidia-lowlatency-64kUbuntu

Fixed in:6.8.0-1058.61.1USN-8492-2

linux-image-6.8.0-1060-awsUbuntu

Fixed in:6.8.0-1060.63~22.04.1USN-8492-2

Fixed in:6.8.0-1060.63USN-8492-1

linux-image-6.8.0-1060-aws-64kUbuntu

Fixed in:6.8.0-1060.63~22.04.1USN-8492-2

Fixed in:6.8.0-1060.63USN-8492-1

linux-image-6.8.0-1060-aws-fipsUbuntu

Fixed in:6.8.0-1060.63+fips1USN-8492-1

linux-image-6.8.0-1060-ibmUbuntu

Fixed in:6.8.0-1060.61~22.04.1USN-8492-2

Fixed in:6.8.0-1060.61USN-8492-1

linux-image-6.8.0-1063-gcpUbuntu

Fixed in:6.8.0-1063.69~22.04.1USN-8492-2

Fixed in:6.8.0-1063.69USN-8492-1

linux-image-6.8.0-1063-gcp-64kUbuntu

Fixed in:6.8.0-1063.69~22.04.1USN-8492-2

Fixed in:6.8.0-1063.69USN-8492-1

linux-image-6.8.0-1063-gcp-fipsUbuntu

Fixed in:6.8.0-1063.69+fips1USN-8492-1

linux-image-6.8.0-134-genericUbuntu

Fixed in:6.8.0-134.134USN-8492-1

linux-image-6.8.0-134-generic-64kUbuntu

Fixed in:6.8.0-134.134USN-8492-1

linux-image-6.8.0-134-lowlatencyUbuntu

Fixed in:6.8.0-134.134.1~22.04.1USN-8497-1

Fixed in:6.8.0-134.134.1USN-8497-1

linux-image-6.8.0-134-lowlatency-64kUbuntu

Fixed in:6.8.0-134.134.1~22.04.1USN-8497-1

Fixed in:6.8.0-134.134.1USN-8497-1

linux-image-6.8.0-2049-raspi-realtimeUbuntu

Fixed in:6.8.0-2049.50USN-8492-3

linux-image-6.8.1-1055-realtimeUbuntu

Fixed in:6.8.1-1055.56~22.04.1USN-8492-1

Fixed in:6.8.1-1055.56USN-8492-1

linux-image-awsUbuntu

Fixed in:6.8.0-1060.63~22.04.1USN-8492-2

linux-image-aws-6.8Ubuntu

Fixed in:6.8.0-1060.63~22.04.1USN-8492-2

Fixed in:6.8.0-1060.63USN-8492-1

linux-image-aws-64kUbuntu

Fixed in:6.8.0-1060.63~22.04.1USN-8492-2

linux-image-aws-64k-6.8Ubuntu

Fixed in:6.8.0-1060.63~22.04.1USN-8492-2

Fixed in:6.8.0-1060.63USN-8492-1

linux-image-aws-64k-lts-24.04Ubuntu

Fixed in:6.8.0-1060.63USN-8492-1

linux-image-aws-fipsUbuntu

Fixed in:6.8.0-1060.63+fips1USN-8492-1

linux-image-aws-fips-6.8Ubuntu

Fixed in:6.8.0-1060.63+fips1USN-8492-1

linux-image-aws-lts-24.04Ubuntu

Fixed in:6.8.0-1060.63USN-8492-1

linux-image-gcpUbuntu

Fixed in:6.8.0-1063.69~22.04.1USN-8492-2

linux-image-gcp-6.8Ubuntu

Fixed in:6.8.0-1063.69~22.04.1USN-8492-2

Fixed in:6.8.0-1063.69USN-8492-1

linux-image-gcp-64kUbuntu

Fixed in:6.8.0-1063.69~22.04.1USN-8492-2

linux-image-gcp-64k-6.8Ubuntu

Fixed in:6.8.0-1063.69~22.04.1USN-8492-2

Fixed in:6.8.0-1063.69USN-8492-1

linux-image-gcp-64k-lts-24.04Ubuntu

Fixed in:6.8.0-1063.69USN-8492-1

linux-image-gcp-fipsUbuntu

Fixed in:6.8.0-1063.69+fips1USN-8492-1

linux-image-gcp-fips-6.8Ubuntu

Fixed in:6.8.0-1063.69+fips1USN-8492-1

linux-image-gcp-lts-24.04Ubuntu

Fixed in:6.8.0-1063.69USN-8492-1

linux-image-genericUbuntu

Fixed in:6.8.0-134.134USN-8492-1

linux-image-generic-6.8Ubuntu

Fixed in:6.8.0-134.134USN-8492-1

linux-image-generic-64kUbuntu

Fixed in:6.8.0-134.134USN-8492-1

linux-image-generic-64k-6.8Ubuntu

Fixed in:6.8.0-134.134USN-8492-1

linux-image-generic-lpaeUbuntu

Fixed in:6.8.0-134.134USN-8492-1

linux-image-gkeUbuntu

Fixed in:6.8.0-1058.64USN-8492-2

linux-image-gke-6.8Ubuntu

Fixed in:6.8.0-1058.64USN-8492-2

linux-image-gke-64kUbuntu

Fixed in:6.8.0-1058.64USN-8492-2

linux-image-gke-64k-6.8Ubuntu

Fixed in:6.8.0-1058.64USN-8492-2

linux-image-gkeopUbuntu

Fixed in:6.8.0-1045.48USN-8492-2

linux-image-gkeop-6.8Ubuntu

Fixed in:6.8.0-1045.48USN-8492-2

linux-image-ibmUbuntu

Fixed in:6.8.0-1060.61USN-8492-1

linux-image-ibm-6.8Ubuntu

Fixed in:6.8.0-1060.61~22.04.1USN-8492-2

Fixed in:6.8.0-1060.61USN-8492-1

linux-image-ibm-classicUbuntu

Fixed in:6.8.0-1060.61USN-8492-1

linux-image-ibm-lts-24.04Ubuntu

Fixed in:6.8.0-1060.61USN-8492-1

linux-image-intel-iot-realtimeUbuntu

Fixed in:6.8.1-1055.56USN-8492-1

linux-image-intel-iotgUbuntu

Fixed in:6.8.0-134.134USN-8492-1

linux-image-kvmUbuntu

Fixed in:6.8.0-134.134USN-8492-1

linux-image-laptop-23.10Ubuntu

Fixed in:6.8.0-134.134USN-8492-1

linux-image-lowlatencyUbuntu

Fixed in:6.8.0-134.134.1USN-8497-1

linux-image-lowlatency-6.8Ubuntu

Fixed in:6.8.0-134.134.1~22.04.1USN-8497-1

Fixed in:6.8.0-134.134.1USN-8497-1

linux-image-lowlatency-64kUbuntu

Fixed in:6.8.0-134.134.1USN-8497-1

linux-image-lowlatency-64k-6.8Ubuntu

Fixed in:6.8.0-134.134.1~22.04.1USN-8497-1

Fixed in:6.8.0-134.134.1USN-8497-1

linux-image-lowlatency-64k-hwe-22.04Ubuntu

Fixed in:6.8.0-134.134.1~22.04.1USN-8497-1

linux-image-lowlatency-hwe-22.04Ubuntu

Fixed in:6.8.0-134.134.1~22.04.1USN-8497-1

linux-image-nvidiaUbuntu

Fixed in:6.8.0-1058.61USN-8492-1

linux-image-nvidia-6.8Ubuntu

Fixed in:6.8.0-1058.61~22.04.1USN-8492-1

Fixed in:6.8.0-1058.61USN-8492-1

linux-image-nvidia-64kUbuntu

Fixed in:6.8.0-1058.61USN-8492-1

linux-image-nvidia-64k-6.8Ubuntu

Fixed in:6.8.0-1058.61~22.04.1USN-8492-1

Fixed in:6.8.0-1058.61USN-8492-1

linux-image-nvidia-64k-hwe-22.04Ubuntu

Fixed in:6.8.0-1058.61~22.04.1USN-8492-1

linux-image-nvidia-hwe-22.04Ubuntu

Fixed in:6.8.0-1058.61~22.04.1USN-8492-1

linux-image-nvidia-lowlatencyUbuntu

Fixed in:6.8.0-1058.61.1USN-8492-2

linux-image-nvidia-lowlatency-6.8Ubuntu

Fixed in:6.8.0-1058.61.1USN-8492-2

linux-image-nvidia-lowlatency-64kUbuntu

Fixed in:6.8.0-1058.61.1USN-8492-2

linux-image-nvidia-lowlatency-64k-6.8Ubuntu

Fixed in:6.8.0-1058.61.1USN-8492-2

linux-image-nvidia-tegraUbuntu

Fixed in:6.8.0-1029.30USN-8498-1

linux-image-nvidia-tegra-6.8Ubuntu

Fixed in:6.8.0-1029.30USN-8498-1

linux-image-nvidia-tegra-rtUbuntu

Fixed in:6.8.0-1029.30USN-8498-1

linux-image-nvidia-tegra-rt-6.8Ubuntu

Fixed in:6.8.0-1029.30USN-8498-1

linux-image-oem-20.04Ubuntu

Fixed in:6.8.0-134.134USN-8492-1

linux-image-oem-20.04bUbuntu

Fixed in:6.8.0-134.134USN-8492-1

linux-image-oem-20.04cUbuntu

Fixed in:6.8.0-134.134USN-8492-1

linux-image-oem-20.04dUbuntu

Fixed in:6.8.0-134.134USN-8492-1

linux-image-oem-22.04Ubuntu

Fixed in:6.8.0-134.134USN-8492-1

linux-image-oracleUbuntu

Fixed in:6.8.0-1057.58~22.04.1USN-8492-2

linux-image-oracle-6.8Ubuntu

Fixed in:6.8.0-1057.58~22.04.1USN-8492-2

Fixed in:6.8.0-1057.58USN-8492-1

linux-image-oracle-64kUbuntu

Fixed in:6.8.0-1057.58~22.04.1USN-8492-2

linux-image-oracle-64k-6.8Ubuntu

Fixed in:6.8.0-1057.58~22.04.1USN-8492-2

Fixed in:6.8.0-1057.58USN-8492-1

linux-image-oracle-64k-lts-24.04Ubuntu

Fixed in:6.8.0-1057.58USN-8492-1

linux-image-oracle-lts-24.04Ubuntu

Fixed in:6.8.0-1057.58USN-8492-1

linux-image-raspi-realtimeUbuntu

Fixed in:6.8.0-2049.50USN-8492-3

linux-image-raspi-realtime-6.8Ubuntu

Fixed in:6.8.0-2049.50USN-8492-3

linux-image-realtimeUbuntu

Fixed in:6.8.1-1055.56USN-8492-1

linux-image-realtime-6.8.1Ubuntu

Fixed in:6.8.1-1055.56~22.04.1USN-8492-1

Fixed in:6.8.1-1055.56USN-8492-1

linux-image-realtime-hwe-22.04Ubuntu

Fixed in:6.8.1-1055.56~22.04.1USN-8492-1

linux-image-virtualUbuntu

Fixed in:6.8.0-134.134USN-8492-1

linux-image-virtual-6.8Ubuntu

Fixed in:6.8.0-134.134USN-8492-1

linux-image-xilinxUbuntu

Fixed in:6.8.0.1032.33USN-8499-1

linux-image-xilinx-6.8Ubuntu

Fixed in:6.8.0.1032.33USN-8499-1

linux-image-xilinx-zynqmpUbuntu

Fixed in:6.8.0.1032.33USN-8499-1

linux-lowlatencyUbuntu

Fixed in:6.8.0-134.134.1USN-8497-1

linux-lowlatency-hwe-6.8Ubuntu

Fixed in:6.8.0-134.134.1~22.04.1USN-8497-1

linux-nvidiaUbuntu

Fixed in:6.8.0-1058.61USN-8492-1

linux-nvidia-6.8Ubuntu

Fixed in:6.8.0-1058.61~22.04.1USN-8492-1

linux-nvidia-lowlatencyUbuntu

Fixed in:6.8.0-1058.61.1USN-8492-2

linux-nvidia-tegraUbuntu

Fixed in:6.8.0-1029.30USN-8498-1

linux-oracleUbuntu

Fixed in:6.8.0-1057.58USN-8492-1

linux-oracle-6.8Ubuntu

Fixed in:6.8.0-1057.58~22.04.1USN-8492-2

linux-raspi-realtimeUbuntu

Fixed in:6.8.0-2049.50USN-8492-3

linux-realtimeUbuntu

Fixed in:6.8.1-1055.56USN-8492-1

linux-realtime-6.8Ubuntu

Fixed in:6.8.1-1055.56~22.04.1USN-8492-1

linux-xilinxUbuntu

Fixed in:6.8.0-1032.33USN-8499-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

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

Exploit Intelligence

0.13%probability of exploitation in 30 days

3rdpercentile

Low risk: more likely to be exploited than 3% of all known CVEs.

References

Patch8

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-11.