SB20260928159 - Use-after-free in Linux kernel bpf
Published: September 28, 2026 Updated: September 30, 2026
Security Bulletin ID
SB20260928159
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-2026-98036)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to trigger a timer callback with references to freed memory.
The vulnerability exists due to improper lifecycle management in rhtab_map_update_elem() for BPF hash-map elements when updating a recycled map element. A local user can retain a map-value pointer after deleting its element, arm a timer through that pointer, and cause the element to be recycled.
Remediation
Install update from vendor's website.