SB20260816256 - Double free in Linux kernel usb peak_usb driver
Published: August 16, 2026
Security Bulletin ID
SB20260816256
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Double free (CVE-ID: CVE-2026-74456)
CWE-ID: CWE-415 - Double Free
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to double free in peak_usb_start() in the peak_usb CAN USB driver when handling a failed URB submission. A local user can trigger the vulnerable error path to cause a denial of service.
The issue occurs because the transfer buffer is freed explicitly after URB submission failure and then freed again when the URB is released.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/4bb3325075138dd5346b71589a959878b564dc0b
- https://git.kernel.org/stable/c/525640b93d3e5f82f4ebea4730f4e0cf799522ba
- https://git.kernel.org/stable/c/92d0de80ca2223b9c7da78020155b6cb27824cc0
- https://git.kernel.org/stable/c/9b3d5a6d952c38bbcf07f903cbeadefdb56b9bc9
- https://git.kernel.org/stable/c/dfb17bf04a764462000f11258a7c06aa92d1f261