VulnerabilityPublished 16 Dec 2025Updated 31 Jul 2026

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

Affects Linux kernelSource GCVE Database

Not known to be exploited · fixed in 5.15.0-1103.110~20.04.1 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Medium

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.1% chance of exploitation in 30 days – higher than 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 5.15.0-1103.110~20.04.1, 5.15.0-1110.119~20.04.1, 5.15.0-1103.112~20.04.1 +70

Exploitation evidence

Disclosed: evidence found.
CVE published 16 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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
Ubuntu 25.10linux`pkg:deb/ubuntu/linux@6.17.0-19.19?arch=source&distro=questing`Other threats	Affected <6.17.0-19.19	Fixed in 6.17.0-19.19
Ubuntu 25.10linux-aws`pkg:deb/ubuntu/linux-aws@6.17.0-1009.9?arch=source&distro=questing`Other threats	Affected <6.17.0-1009.9	Fixed in 6.17.0-1009.9
Ubuntu 25.10linux-azure`pkg:deb/ubuntu/linux-azure@6.17.0-1010.10?arch=source&distro=questing`Other threats	Affected <6.17.0-1010.10	Fixed in 6.17.0-1010.10
Ubuntu 25.10linux-azure-fde`pkg:deb/ubuntu/linux-azure-fde@6.17.0-1017.17?arch=source&distro=questing`Other threats	Affected 6.17.0-1003.3 – 6.17.0-1017.17 10 affected builds	Fixed in–
Ubuntu 25.10linux-gcp`pkg:deb/ubuntu/linux-gcp@6.17.0-1009.9?arch=source&distro=questing`Other threats	Affected <6.17.0-1009.9	Fixed in 6.17.0-1009.9
Ubuntu 25.10linux-oracle`pkg:deb/ubuntu/linux-oracle@6.17.0-1009.9?arch=source&distro=questing`Other threats	Affected <6.17.0-1009.9	Fixed in 6.17.0-1009.9

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available and should be applied. The issue is fixed in updated linux-hwe-edge kernel versions as per the Ubuntu security notice USN-8094-1. Users should upgrade to kernel versions at or beyond the fixed releases to remediate this vulnerability.

Description

A vulnerability in the Linux kernel's kvaser_usb driver could cause an infinite loop in command parsing due to improper handling of zero-length commands aligned on USB packet boundaries. This issue is fixed by adjusting the buffer position calculation to ensure progress in parsing. The flaw affects certain versions of the linux-hwe-edge kernel prior to specific patch releases. The vulnerability has been addressed in official Ubuntu security updates.

Impact

If exploited, this vulnerability could cause the affected kernel driver to enter an infinite loop, potentially leading to denial of service conditions. There is no indication of privilege escalation or data exposure from this specific flaw. No known exploits are reported in the wild.

Summary

The Linux kernel's kvaser_usb driver contained a logic flaw in the functions kvaser_usb_leaf_wait_cmd() and kvaser_usb_leaf_read_bulk_callback related to handling zero-length commands used for USB packet alignment. When a zero-length command occurs exactly on a USB endpoint packet boundary, the position pointer 'pos' does not advance due to the behavior of the round_up() function, causing an infinite loop in command parsing. The patch modifies the calculation to use 'pos + 1' to guarantee advancement past the boundary, preventing the infinite loop.

GCVE source: db.gcve.eu
OSV ID: UBUNTU-CVE-2025-68308
Osv Schema Version: 1.7.0
Ecosystems: Ubuntu:16.04:LTS, Ubuntu:18.04:LTS, Ubuntu:Pro:18.04:LTS, Ubuntu:Pro:20.04:LTS, Ubuntu:20.04:LTS, Ubuntu:Pro:FIPS-updates:20.04:LTS, Ubuntu:Pro:FIPS:20.04:LTS, Ubuntu:22.04:LTS, Ubuntu:Nvidia-BlueField:22.04:LTS, Ubuntu:Pro:FIPS-preview:22.04:LTS, Ubuntu:Pro:FIPS-updates:22.04:LTS, Ubuntu:Pro:Realtime:22.04:LTS, Ubuntu:24.04:LTS, Ubuntu:Nvidia-BlueField:24.04:LTS, Ubuntu:Pro:FIPS-updates:24.04:LTS, Ubuntu:Pro:Realtime:24.04:LTS, Ubuntu:25.10

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 15 Sep 2026, 11:20 UTC

Technical details

References

Community reviews

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