SB20260918178 - Use-after-free in Linux kernel uio driver
Published: September 18, 2026
Security Bulletin ID
SB20260918178
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-93054)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in the __uio_register_device() UIO registration failure path when an opener races with a failed registration after device_add(). A local user can race opening /dev/uioX with a failed device registration to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/15340b00e665af805523b08515294a1aa1778151
- https://git.kernel.org/stable/c/16695e9059d80ea6661e8399064b0c01f641dd8c
- https://git.kernel.org/stable/c/234156f6c6d9ec35dc47abbcc3adc3c79fc6a5ac
- https://git.kernel.org/stable/c/506b43dde5f9ac0068b1360e6b5dbee07fda59fb
- https://git.kernel.org/stable/c/63eaa7663335d482a8825c231213e312cacea567
- https://git.kernel.org/stable/c/67b6fc084b034a91c3ec7907a3fed89a2450f30b
- https://git.kernel.org/stable/c/df4faf65194ec6c315a59be4c6749eaeb3009243
- https://git.kernel.org/stable/c/ec5bd6731183eb6f619140c9bef2ee11ed818c20