VulnerabilityPublished 15 Aug 2026Updated 6 Nov 2026

CVE-2026-74458: Linux kernel · can: kvaser_usb_leaf: kvaser_usb_leaf_wait_cmd(): validate received command extents

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in d9e91672526ffa279709b15490118aea1bdee714 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 18:03 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in d9e91672526ffa279709b15490118aea1bdee714, c00ec53d7dec08134e97071850cc00ef000c5b77, 695aea154bb2d453e6daada1510972fafd075285 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 15 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 080f40a6fa28dab299da7a652e444b1e2d9231e7, < d9e91672526ffa279709b15490118aea1bdee714	Fixed in d9e91672526ffa279709b15490118aea1bdee714
LinuxLinux	Affected ≥ 080f40a6fa28dab299da7a652e444b1e2d9231e7, < c00ec53d7dec08134e97071850cc00ef000c5b77	Fixed in c00ec53d7dec08134e97071850cc00ef000c5b77
LinuxLinux	Affected ≥ 080f40a6fa28dab299da7a652e444b1e2d9231e7, < 695aea154bb2d453e6daada1510972fafd075285	Fixed in 695aea154bb2d453e6daada1510972fafd075285
LinuxLinux	Affected ≥ 080f40a6fa28dab299da7a652e444b1e2d9231e7, < 0293dd153f9dbc1ddf5dacdccc76b363bce4a8ee	Fixed in 0293dd153f9dbc1ddf5dacdccc76b363bce4a8ee
LinuxLinux	Affected ≥ 080f40a6fa28dab299da7a652e444b1e2d9231e7, < 185cb1fa38142a3cbf223dd8b3abb24217f330d3	Fixed in 185cb1fa38142a3cbf223dd8b3abb24217f330d3
LinuxLinux	Affected ≥ 080f40a6fa28dab299da7a652e444b1e2d9231e7, < 72f96c2942f11a0ae8663adcb3d9ee986e07d4fa	Fixed in 72f96c2942f11a0ae8663adcb3d9ee986e07d4fa

AI-suggested

A fix is available in the Linux kernel commits identified by the provided fixed version hashes. Users should update their Linux kernel to a version including these fixes to mitigate the vulnerability. No additional mitigation steps are indicated.

Description

A vulnerability in the Linux kernel's kvaser_usb_leaf driver was resolved by validating received command extents. The issue involved processing variable-length USB commands where nonzero commands shorter than the expected header length could be dispatched improperly, potentially leading to out-of-bounds memory operations. The fix rejects commands that do not contain the fixed header or that extend beyond the USB buffer, preventing unsafe copying.

Impact

This vulnerability could lead to memory corruption due to improper validation of USB command lengths, potentially causing kernel crashes or undefined behavior. However, no known exploits in the wild have been reported. The impact is limited to systems using the affected kvaser_usb_leaf driver in the Linux kernel.

Summary

The Linux kernel's kvaser_usb_leaf driver had a flaw in the kvaser_usb_leaf_wait_cmd() function where variable-length USB commands were not properly validated. Commands shorter than the fixed header length but nonzero could be dispatched, and the wait path copied commands into a fixed-size structure using the device-provided length without sufficient bounds checking. The vulnerability was addressed by rejecting commands lacking the fixed header or extending beyond the USB buffer, and by rejecting commands that would overflow the destination structure before copying.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 6 Nov 2026, 18:03 UTC

Technical details

References

Community reviews

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