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NVD / CVE Program· CNA Linux

CVE-2026-43429: USB: usbtmc: Use usb_bulk_msg_killable() with user-specified timeouts

MediumCVSS 5.5 · v3.1—No exploit Fix available

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 0535f84cb94c9d8bcba0a2a5b3fac81b7d97235d, 39bd4097292fd8564cf2cfba9356f8ab11e38d12, 6cb7dc91f057dd8ce44f6caa2995d8e22784ed0a.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0535f84cb94c9d8bcba0a2a5b3fac81b7d97235d, 39bd4097292fd8564cf2cfba9356f8ab11e38d12, 6cb7dc91f057dd8ce44f6caa2995d8e22784ed0a 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: USB: usbtmc: Use usb_bulk_msg_killable() with user-specified timeouts The usbtmc driver accepts timeout values specified by the user in an ioctl command, and uses these timeouts for some usb_bulk_msg() calls. Since the user can specify arbitrarily long timeouts and usb_bulk_msg() uses unkillable waits, call usb_bulk_msg_killable() instead to avoid the possibility of the user hanging a kernel thread indefinitely.

Published
May 8, 2026
Updated
Nov 11, 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%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

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-2026-43429

When you'll hear from us

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  • 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

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

    • 4.19affected
    • 048c6d88a0214757926f264823829e79154fcd4f and later · before e14a0dcdf468c3ad616bb06696c7c64c36e736d8affected · git
    • 048c6d88a0214757926f264823829e79154fcd4f and later · before 7fa72c369c23c27d1f64883c1e276af950557fb1affected · git
    • 048c6d88a0214757926f264823829e79154fcd4f and later · before 72c0a063489be183cfb99e7050aaef503bdb6449affected · git
    • 048c6d88a0214757926f264823829e79154fcd4f and later · before 39bd4097292fd8564cf2cfba9356f8ab11e38d12affected · git
    • 048c6d88a0214757926f264823829e79154fcd4f and later · before 0535f84cb94c9d8bcba0a2a5b3fac81b7d97235daffected · git
    • 048c6d88a0214757926f264823829e79154fcd4f and later · before 6cb7dc91f057dd8ce44f6caa2995d8e22784ed0aaffected · git
    • 048c6d88a0214757926f264823829e79154fcd4f and later · before d4f1c45bdff3f393f9ab7e76795901c442b9eb76affected · git
    • 048c6d88a0214757926f264823829e79154fcd4f and later · before 7784caa413a89487dd14dd5c41db8753483b2acbaffected · git
    • before 4.19not affected · semver
Affected versions · NVD (8)

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

  • linux linux kernel4.19 and later · before 5.10.253
  • linux linux kernel5.11 and later · before 5.15.203
  • linux linux kernel5.16 and later · before 6.1.167
  • linux linux kernel6.2 and later · before 6.6.130
  • linux linux kernel6.7 and later · before 6.12.78
  • linux linux kernel6.13 and later · before 6.18.19
  • linux linux kernel6.19 and later · before 6.19.9
  • linux linux kernel7.0

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 6.19.10-16.19.10-1

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-2026-43427May 8, 2026 · usb: class: cdc-wdm: fix reordering issue in read code path
    28Monitor
  • ← EarlierCVE-2026-43428May 8, 2026 · USB: core: Limit the length of unkillable synchronous timeouts
    22Monitor
  • Later →CVE-2026-43430May 8, 2026 · usb: yurex: fix race in probe
    18Monitor

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 Linux0535f84cb94c9d8bcba0a2a5b3fac81b7d97235dVendor (CNA)
Linux Linux39bd4097292fd8564cf2cfba9356f8ab11e38d12Vendor (CNA)
Linux Linux6cb7dc91f057dd8ce44f6caa2995d8e22784ed0aVendor (CNA)
Linux Linux72c0a063489be183cfb99e7050aaef503bdb6449Vendor (CNA)
Linux Linux7784caa413a89487dd14dd5c41db8753483b2acbVendor (CNA)
Linux Linux7fa72c369c23c27d1f64883c1e276af950557fb1Vendor (CNA)
Linux Linuxd4f1c45bdff3f393f9ab7e76795901c442b9eb76Vendor (CNA)
Linux Linuxe14a0dcdf468c3ad616bb06696c7c64c36e736d8Vendor (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.

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

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.

References

Show all references (7 more)

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

All records