CVE-2026-98062

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

bpf: Mark signal tracepoint siginfo arguments as scalar

The signal_generate and signal_deliver tracepoints declare their info

argument as a struct kernel_siginfo pointer. btf_ctx_access() therefore

treats it as a trusted pointer for tp_btf programs.

Signal delivery also uses SEND_SIG_NOINFO and SEND_SIG_PRIV as special

values for this argument. Those values are zero and one respectively,

and are not pointers. A tp_btf program can currently dereference either

value and fault the kernel. In particular, signal_generate can run from

timer interrupt context, turning the fault into a kernel panic.

Record both tracepoints in raw_tp_null_args[] and mark argument one as

a non-pointer. This preserves scalar access to the cookie while rejecting

direct and helper-mediated pointer use. Merely marking it nullable would

not suffice because SEND_SIG_PRIV is nonzero.