CVE-2026-98611

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

bpf: Check params size before reading reserved fields

bpf_crypto_ctx_create() is a kfunc whose second argument is declared

with the __sz annotation, so the verifier only guarantees that

params__sz bytes of params are valid. The function nevertheless reads

params->reserved[0] and params->reserved[1] (offsets 14 and 15) before

comparing params__sz against the size of struct bpf_crypto_params, so a

BPF program can pass a shorter buffer and have the kernel read past the

region that was validated for it.

Move the size check in front of the reserved field reads.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References