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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 0293dd153f9dbc1ddf5dacdccc76b363bce4a8ee, 185cb1fa38142a3cbf223dd8b3abb24217f330d3, 21f0465fd86d77794aaed8e05f833634f68d178d; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0293dd153f9dbc1ddf5dacdccc76b363bce4a8ee, 185cb1fa38142a3cbf223dd8b3abb24217f330d3, 21f0465fd86d77794aaed8e05f833634f68d178d; azl3 kernel 6.6.150.1-1 on Azure Linux 3.0 6.6.152.1-1 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: can: kvaser_usb_leaf: kvaser_usb_leaf_wait_cmd(): validate received command extents The wait and bulk receive paths walk variable-length commands from a USB buffer. A nonzero command shorter than CMD_HEADER_LEN can still be dispatched, and the wait path copies a matching command into a fixed caller-owned struct kvaser_cmd using the device-provided length. Reject nonzero commands that do not contain the fixed header or that extend beyond the current USB buffer item. In the wait path, also reject a matching command that exceeds the destination before copying it.

—No exploit Fix available
Published
Aug 15, 2026
Updated
Aug 19, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
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.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
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  • 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.

—

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

    • 3.8affected
    • 080f40a6fa28dab299da7a652e444b1e2d9231e7 and later · before c00ec53d7dec08134e97071850cc00ef000c5b77affected · git
    • 080f40a6fa28dab299da7a652e444b1e2d9231e7 and later · before d9e91672526ffa279709b15490118aea1bdee714affected · git
    • 080f40a6fa28dab299da7a652e444b1e2d9231e7 and later · before 72f96c2942f11a0ae8663adcb3d9ee986e07d4faaffected · git
    • 080f40a6fa28dab299da7a652e444b1e2d9231e7 and later · before 695aea154bb2d453e6daada1510972fafd075285affected · git
    • 080f40a6fa28dab299da7a652e444b1e2d9231e7 and later · before 3d0897ec623e422695d70d80ae456f89476c5328affected · git
    • 080f40a6fa28dab299da7a652e444b1e2d9231e7 and later · before 185cb1fa38142a3cbf223dd8b3abb24217f330d3affected · git
    • 080f40a6fa28dab299da7a652e444b1e2d9231e7 and later · before 21f0465fd86d77794aaed8e05f833634f68d178daffected · git
    • 080f40a6fa28dab299da7a652e444b1e2d9231e7 and later · before 0293dd153f9dbc1ddf5dacdccc76b363bce4a8eeaffected · git
    • before 3.8not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.187-16.1.187-1
Debian:12linux-6.12before 6.12.107-1~deb12u16.12.107-1~deb12u1
Debian:13linuxbefore 6.12.105-16.12.105-1
Debian:14linuxbefore 7.1.8-17.1.8-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-74455Aug 15, 2026 · can: peak_usb: validate uCAN receive record lengths
    0Monitor
  • ← EarlierCVE-2026-74457Aug 15, 2026 · can: peak_usb: add bounds check for USB channel index
    0Monitor
  • Later →CVE-2026-74459Aug 15, 2026 · can: etas_es58x: es58x_read_bulk_callback(): fix RX buffer leak on URB resubmit failure
    0Monitor

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 Linux0293dd153f9dbc1ddf5dacdccc76b363bce4a8eeVendor (CNA)
Linux Linux185cb1fa38142a3cbf223dd8b3abb24217f330d3Vendor (CNA)
Linux Linux21f0465fd86d77794aaed8e05f833634f68d178dVendor (CNA)
Linux Linux3d0897ec623e422695d70d80ae456f89476c5328Vendor (CNA)
Linux Linux695aea154bb2d453e6daada1510972fafd075285Vendor (CNA)
Linux Linux72f96c2942f11a0ae8663adcb3d9ee986e07d4faVendor (CNA)
Linux Linuxc00ec53d7dec08134e97071850cc00ef000c5b77Vendor (CNA)
Linux Linuxd9e91672526ffa279709b15490118aea1bdee714Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.06.6.152.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.187-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.107-1~deb12u1 · 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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