CVE-2026-98062
UnknownSummary
In the Linux kernel, the signal_generate and signal_deliver tracepoints declare their info argument as a struct kernel_siginfo pointer, so btf_ctx_access() treats it as a trusted pointer for tp_btf programs. However, signal delivery uses SEND_SIG_NOINFO (0) and SEND_SIG_PRIV (1) as special values that are not pointers. A tp_btf program can dereference these values and fault the kernel, and signal_generate can run from timer interrupt context, leading to a kernel panic.
Risk Assessment
A local attacker with CAP_BPF privileges can trigger a kernel panic via a tp_btf program, causing complete system unavailability. The risk is high in production environments with BPF enabled.
Recommendation
Update the Linux kernel to a version containing the fix. Until the update, restrict BPF access (CAP_BPF) to trusted users only.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS