SB20260919100 - Use-after-free in Linux kernel net netdevsim driver
Published: September 19, 2026
Security Bulletin ID
SB20260919100
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-90113)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to access freed memory.
The vulnerability exists due to a use-after-free in the netdevsim queue-to-NAPI mapping when resetting a receive queue and requesting queue information through Netlink. A local user can reset a queue through the queue_reset debugfs interface and request queue information through NETDEV_CMD_QUEUE_GET to access freed memory.
Remediation
Install update from vendor's website.