CVE-2026-98132
kernel: bpf: don't downgrade half-dead scalar zero spills to STACK_ZERO
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 25, 2026
Updated · October 9, 2026
Description
A flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) verifier. A local attacker with permission to load BPF programs could exploit this flaw to achieve privilege escalation or cause a Denial of Service (DoS). This issue arises when the verifier improperly handles scalar values stored on the stack during state cleaning, breaking precision tracking and allowing crafted programs to bypass kernel safety checks.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')