CVE-2026-98647

A flaw was found in the Linux kernel's BPF (Berkeley Packet Filter) subsystem. This vulnerability allows a local user to cause a Denial of Service (DoS) by crashing the kernel. When loading a specially crafted BPF program that accesses a structure with an empty flexible array member, the verifier attempts to compute offsets without checking for a zero element size, triggering a divide-by-zero error.

This vulnerability is rated as having a Moderate impact because exploitation requires elevated administrative privileges, specifically CAP_BPF or CAP_SYS_ADMIN, to load the sleepable programs necessary to reach the affected verifier logic. Default Red Hat Enterprise Linux environments do not permit unprivileged users to load BPF programs or manipulate BTF objects. Consequently, the flaw is confined to a local denial of service via a kernel panic, without posing a risk to system confidentiality or integrity.

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.