SB20260727251 - NULL pointer dereference in Linux kernel usb usbip driver
Published: July 27, 2026
Security Bulletin ID
SB20260727251
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) NULL pointer dereference (CVE-ID: CVE-2026-64331)
CWE-ID: CWE-476 - NULL Pointer Dereference
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 a null pointer dereference in vep_dequeue() when cancelling FunctionFS AIO requests. A local user can trigger request cancellation on the FunctionFS AIO path to cause a denial of service.
The issue is reachable when stressing FunctionFS endpoints via AIO in usbip's vudc path.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/0025276175fbbe0dcbf3f84d090b0adee769e9d9
- https://git.kernel.org/stable/c/0443e4416aa1ee97748d1ed904eaf3352c60045e
- https://git.kernel.org/stable/c/1226293ec9bed3d4cc5b05eeeb811d315ca51652
- https://git.kernel.org/stable/c/347b59e9f96719d89b6ef555d02a18ada1a5846f
- https://git.kernel.org/stable/c/3750f75f29f99c0223601e2ee73ad084adec47bd
- https://git.kernel.org/stable/c/9858c91d9ee6a13c45311569039413729fc9b757
- https://git.kernel.org/stable/c/c5371e0b91b24159a3ebaa61e70b0980bcf03c0a
- https://git.kernel.org/stable/c/d0ebf9cc7c2ddf95a7cfc654b940bdacb7edde97