Use of uninitialized resource in Linux kernel - CVE-2026-90300
Published: September 18, 2026
Vulnerability identifier: #VU151183
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-90300
CWE-ID: CWE-908
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-90300
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3