Live › vulnerability › CVE-2026-98611
Go to dashboardThe Linux kernel's bpf_crypto_ctx_create() kfunc reads reserved fields of its params argument before checking the buffer size, so a BPF program can pass a shorter buffer. The kernel can then read memory beyond the region the verifier validated for that argument.
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First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
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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.
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