SB20260727110 - Use-after-free in Linux kernel usb misc driver
Published: July 27, 2026
Security Bulletin ID
SB20260727110
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) Use-after-free (CVE-ID: CVE-2026-64455)
CWE-ID: CWE-416 - Use After 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 use-after-free in chaoskey_release() in the chaoskey USB driver when closing the device file after the USB device has been unplugged. A local user can close the device file after device unplug to cause a denial of service.
The invalid access occurs in a debugging log statement after the usb_interface structure has already been deallocated.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/2a52d55c86a429dac47886b8424e67f90b001e67
- https://git.kernel.org/stable/c/3ad5fbcced4e9c2b0fee3c1b76289a147fc35b89
- https://git.kernel.org/stable/c/5ec61fbef9ec5635c492ae63dfb5d13f2bdf1023
- https://git.kernel.org/stable/c/6c82f88bc7a8458d5c60f9b354c4d32d233f0cac
- https://git.kernel.org/stable/c/8f50613bff228272577893aa10a346a2f3063e49
- https://git.kernel.org/stable/c/abf76d3239dee97b66e7241ad04811f1ce562e28
- https://git.kernel.org/stable/c/f3e409476ad0703c54c14f245e4e143c8124e1bd
- https://git.kernel.org/stable/c/fe7a0f4be283b40dd592540027279735120d0d6f