CVE-2026-98816

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

bpf: Fix overflow of jump offset in constant blinding

bpf_jit_blind_insn() rewrites 'if rX op imm goto off' into:

AX = imm ^ rnd

AX ^= rnd

if rX op AX goto off

and subtracts 2 from off when the jump is backward. off is s16, so

-32767 and -32768 wrap and the jump goes 32767 insns forward, past the

end of the prog. The jump is inside the patch, hence bpf_adj_branches()

doesn't check it. The kernel crashes when such prog runs with

bpf_jit_harden=2.

Return -ERANGE in such case. bpf_jit_blind_constants() fails the same

way when blinding of other insns moves a jump out of range.