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CVE-2026-43333

kernel: bpf: reject direct access to nullable PTR_TO_BUF pointers

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · May 8, 2026

Updated · June 28, 2026

Description

A flaw was found in the Linux kernel's Berkeley Packet Filter (BPF) component. This vulnerability allows a local attacker to cause a kernel null pointer dereference by directly accessing nullable PTR_TO_BUF pointers without proper null checks. This can lead to a system crash, resulting in a Denial of Service (DoS).

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 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-476 · NULL Pointer Dereference