Vulnerability in Linux kernel (CVE-2025-68308)
Summary
Vulnerability in Linux kernel (CVE-2025-68308). Risk of unauthorized operations or information disclosure. Exploitable via kvaser_usb_leaf_read_bulk_callback.
Original description
The description as published by the source.
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.
Source: NIST National Vulnerability Database NVD
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2025-68308 has been found in Linux kernel.
Attackers can target a specific entry point like kvaser_usb_leaf_read_bulk_callback over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Linux kernel CVE-2025-68308" on the vendor's site.
CVE-2025-68308 (Linux kernel)
Attack surface: kvaser_usb_leaf_read_bulk_callback / pos / round_up
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (unclassified) exists in Linux kernel. Attackers reach the vulnerable code path via kvaser_usb_leaf_read_bulk_callback.
Check the vendor advisory for the affected versions of Linux kernel. Attack surface: kvaser_usb_leaf_read_bulk_callback / pos / round_up.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Linux kernel を使っているサービスとバージョンを洗い出す。
-
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- BellSoft Alpaquita BELL-CVE-2025-68308 linux-lts Fixed in: 6.1.159-r0
- Debian DEBIAN-CVE-2025-68308 linux Fixed in: 5.10.247-1
- Ubuntu UBUNTU-CVE-2025-68308 linux-hwe-edge
References
- advisory github.com
- advisory nvd.nist.gov
- package git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org
- web git.kernel.org