CVE-2026-98062

/// Technical description

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.

/// Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

/// Affected products

/// References