SB2026091671 - Use-after-free in Linux kernel gadget function driver
Published: September 16, 2026
Security Bulletin ID
SB2026091671
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-90044)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to compromise confidentiality, integrity, and availability.
The vulnerability exists due to use-after-free in ffs_epfile_write_iter() and ffs_epfile_read_iter() when a concurrent cancellation operation runs after an asynchronous I/O operation fails. A local user can submit an asynchronous I/O operation and cancel it concurrently to compromise confidentiality, integrity, and availability.
Remediation
Install update from vendor's website.