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NVD / CVE Program· CNA Linux

CVE-2025-68308: can: kvaser_usb: leaf: Fix potential infinite loop in command parsers

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: 0.19% (FIRST EPSS).
  • Fixed version: Linux Linux 028e89c7e8b4346302e88df01cc50e0a1f05791a, 0897cea266e39166a36111059ba147192b36592f, 0c73772cd2b8cc108d5f5334de89ad648d89b9ec; azl3 kernel 6.6.117.1-1 on Azure Linux 3.0 6.6.119.3-1.

Low priority for now. Upgrade to Linux Linux 028e89c7e8b4346302e88df01cc50e0a1f05791a, 0897cea266e39166a36111059ba147192b36592f, 0c73772cd2b8cc108d5f5334de89ad648d89b9ec; azl3 kernel 6.6.117.1-1 on Azure Linux 3.0 6.6.119.3-1 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: Fix potential infinite loop in command parsers The `kvaser_usb_leaf_wait_cmd()` and `kvaser_usb_leaf_read_bulk_callback` functions contain logic to zero-length commands. These commands are used to align data to the USB endpoint's wMaxPacketSize boundary. The driver attempts to skip these placeholders by aligning the buffer position `pos` to the next packet boundary using `round_up()` function. However, if zero-length command is found exactly on a packet boundary (i.e., `pos` is a multiple of wMaxPacketSize, including 0), `round_up` function will return the unchanged value of `pos`. This prevents `pos` to be increased, causing an infinite loop in the parsing logic. This patch fixes this in the function by using `pos + 1` instead. This ensures that even if `pos` is on a boundary, the calculation is based on `pos + 1`, forcing `round_up()` to always return the next aligned boundary.

—No exploit Fix available
Published
Dec 16, 2025
Updated
Oct 14, 2026
EPSS
0.1% · 8th 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%

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

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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

    • 4.19affected
    • 7259124eac7d1b76b41c7a9cb2511a30556deebe and later · before 58343e0a4d43699f0e2f5b169384bbe4c0217addaffected · git
    • 7259124eac7d1b76b41c7a9cb2511a30556deebe and later · before 69c7825df64e24dc15d31631a1fc9145324b1345affected · git
    • 7259124eac7d1b76b41c7a9cb2511a30556deebe and later · before 028e89c7e8b4346302e88df01cc50e0a1f05791aaffected · git
    • 7259124eac7d1b76b41c7a9cb2511a30556deebe and later · before e9dd83a75a7274edef21682c823bf0b66d7b6b7faffected · git
    • 7259124eac7d1b76b41c7a9cb2511a30556deebe and later · before 0897cea266e39166a36111059ba147192b36592faffected · git
    • 7259124eac7d1b76b41c7a9cb2511a30556deebe and later · before bd8135a560cf6e64f0b98ed4daadf126a38f7f48affected · git
    • 7259124eac7d1b76b41c7a9cb2511a30556deebe and later · before 0c73772cd2b8cc108d5f5334de89ad648d89b9ecaffected · git
    • before 4.19not affected · semver
    • 5.10.247 and later · up to and including 5.10.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.159-16.1.159-1
Debian:13linuxbefore 6.12.63-16.12.63-1
Debian:14linuxbefore 6.17.11-16.17.11-1

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-2025-68306Dec 16, 2025 · Bluetooth: btusb: mediatek: Fix kernel crash when releasing mtk iso interface
    0Monitor
  • ← EarlierCVE-2025-68307Dec 16, 2025 · can: gs_usb: gs_usb_xmit_callback(): fix handling of failed transmitted URBs
    0Monitor
  • Later →CVE-2025-68309Dec 16, 2025 · PCI/AER: Fix NULL pointer access by aer_info
    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 Linux028e89c7e8b4346302e88df01cc50e0a1f05791aVendor (CNA)
Linux Linux0897cea266e39166a36111059ba147192b36592fVendor (CNA)
Linux Linux0c73772cd2b8cc108d5f5334de89ad648d89b9ecVendor (CNA)
Linux Linux58343e0a4d43699f0e2f5b169384bbe4c0217addVendor (CNA)
Linux Linux69c7825df64e24dc15d31631a1fc9145324b1345Vendor (CNA)
Linux Linuxbd8135a560cf6e64f0b98ed4daadf126a38f7f48Vendor (CNA)
Linux Linuxe9dd83a75a7274edef21682c823bf0b66d7b6b7fVendor (CNA)
azl3 kernel 6.6.117.1-1 on Azure Linux 3.06.6.119.3-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.1.159-1 · 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).

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✗ → ✓

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References

Show all references (6 more)

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

All records