Linux Kernel Vulnerability in BPF Handling Impacting Scalar Zero Spills

CVE-2026-98132

What is CVE-2026-98132?

A vulnerability in the Linux kernel's BPF subsystem allows for improper handling of scalar zero spills. This occurs when a zero value is mistakenly downgraded to a stack representation termed STACK_ZERO, disrupting precision propagation chains within the kernel. When dead values are mismanaged, it opens potential avenues for exploitation. A patch has been implemented to prevent the incorrect conversion of these stack spills, ensuring system integrity and accuracy in processing. Though more complex solutions were considered, the current fix provides a straightforward remedy to boost kernel resilience against this flaw.

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