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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 2902a9b4415a6bafc9b1e5dd360f065d757a0bb7, 3308c7504e093b22e91a4468470309cee2e26b83, 498525d8358d6d20918787e59736d5b6a021e9fd.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 2902a9b4415a6bafc9b1e5dd360f065d757a0bb7, 3308c7504e093b22e91a4468470309cee2e26b83, 498525d8358d6d20918787e59736d5b6a021e9fd or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 6, 2026
Updated
Jun 17, 2026
EPSS
0.1% · 2th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-43255

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel2.6.22 and later · before 5.10.252
  • linux linux kernel5.11 and later · before 5.15.202
  • linux linux kernel5.16 and later · before 6.1.165
  • linux linux kernel6.2 and later · before 6.6.128
  • linux linux kernel6.7 and later · before 6.12.75
  • linux linux kernel6.13 and later · before 6.18.16
  • linux linux kernel6.19 and later · before 6.19.6

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.22affected
    • 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 and later · before 498525d8358d6d20918787e59736d5b6a021e9fdaffected · git
    • 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 and later · before 2902a9b4415a6bafc9b1e5dd360f065d757a0bb7affected · git
    • 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 and later · before 948a39c95d0f8d73722910f8cdb7b6e3e9206232affected · git
    • 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 and later · before 5bfb25495e391a1be0db94b15715174fa06b93a1affected · git
    • 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 and later · before b82073564373e68c6ae3a96039fae14cd002a496affected · git
    • 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 and later · before 3308c7504e093b22e91a4468470309cee2e26b83affected · git
    • 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 and later · before fc188b44547dea4e7350833171982a6312befde9affected · git
    • 876c9d3aeb989cf1961f2c228d309ba5dcfb1172 and later · before d66676e6ca96bf8680f869a9bd6573b26c634622affected · git
    • before 2.6.22not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.170-16.1.170-1
Debian:13linuxbefore 6.12.85-16.12.85-1
Debian:14linuxbefore 6.19.6-16.19.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-43252May 6, 2026 · mptcp: pm: in-kernel: always set ID as avail when rm endp
    22Monitor
  • ← EarlierCVE-2026-43254May 6, 2026 · ovpn: tcp - fix packet extraction from stream
    30Monitor
  • Later →CVE-2026-43256May 6, 2026 · media: qcom: camss: vfe: Fix out-of-bounds access in vfe_isr_reg_update()
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux2902a9b4415a6bafc9b1e5dd360f065d757a0bb7Vendor (CNA)
Linux Linux3308c7504e093b22e91a4468470309cee2e26b83Vendor (CNA)
Linux Linux498525d8358d6d20918787e59736d5b6a021e9fdVendor (CNA)
Linux Linux5bfb25495e391a1be0db94b15715174fa06b93a1Vendor (CNA)
Linux Linux948a39c95d0f8d73722910f8cdb7b6e3e9206232Vendor (CNA)
Linux Linuxb82073564373e68c6ae3a96039fae14cd002a496Vendor (CNA)
Linux Linuxd66676e6ca96bf8680f869a9bd6573b26c634622Vendor (CNA)
Linux Linuxfc188b44547dea4e7350833171982a6312befde9Vendor (CNA)
debian:linux6.1.170-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records