SB20260918370 - Use of uninitialized resource in Linux kernel bpf
Published: September 18, 2026
Security Bulletin ID
SB20260918370
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use of uninitialized resource (CVE-ID: CVE-2026-90300)
CWE-ID: CWE-908 - Use of Uninitialized Resource
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause nondeterministic BPF map-key behavior.
The vulnerability exists due to use of uninitialized memory in __bpf_get_task_stack when a BPF stack helper encounters an error. A local user can invoke an affected BPF stack helper to cause nondeterministic BPF map-key behavior.
The condition occurs when the task stack cannot be acquired or task registers are unavailable.
Remediation
Install update from vendor's website.