CVE-2026-53031

A flaw was found in the Linux kernel. The arena_alloc_pages() function within the Berkeley Packet Filter (BPF) subsystem does not properly validate the node_id parameter. A local attacker could exploit this vulnerability by supplying an invalid node_id, which is then used without bounds checking during memory allocation. This could lead to memory corruption, potentially resulting in a denial of service or other system instability.

The default Red Hat Enterprise Linux kernel prevents unprivileged users from being able to use eBPF by the kernel.unprivileged_bpf_disabled sysctl. This would require a privileged user with CAP_SYS_ADMIN or root to be able to abuse this flaw reducing its attack space.

For the Red Hat Enterprise Linux 9 to confirm the current state, inspect the sysctl with the command:

cat /proc/sys/kernel/unprivileged_bpf_disabled

The setting of 1 would mean that unprivileged users can not use eBPF, mitigating the flaw.

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.