SB20260824192 - Use-after-free in Linux kernel trace
Published: August 24, 2026
Security Bulletin ID
SB20260824192
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-2026-74634)
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 ring_buffer_subbuf_order_set() and rb_advance_iter() when changing the ring buffer sub-buffer order while resizing is disabled. A local user can trigger a non-consuming reader to access freed buffer pages to cause a denial of service.
The issue affects non-consuming reader scenarios in the ring buffer.
Remediation
Install update from vendor's website.