Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.12.6, < 6.13 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/0e78cb242a57e481061fcb542fed4d51afba25c4Patch
- https://git.kernel.org/stable/c/77515ab12e4983e6416f8c35039a3f0c0822ac70Patch
- https://git.kernel.org/stable/c/d2eaea3599bcce659ce91862254dc91bcbdb6351Patch
FAQ
What is CVE-2026-98062?
CVE-2026-98062 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 argu...
How severe is CVE-2026-98062?
CVE-2026-98062 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-98062?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.