SB20260928128 - Type Confusion in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) Type Confusion (CVE-ID: CVE-2026-98062)

CWE-ID: CWE-843 - Type confusion

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper type handling in the signal_generate and signal_deliver tracepoints when tp_btf programs access the siginfo argument. A local user can trigger signal tracepoint processing with a tp_btf program that dereferences the argument to cause a denial of service.

The signal_generate tracepoint can execute in timer interrupt context.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0e78cb242a57e481061fcb542fed4d51afba25c4
• https://git.kernel.org/stable/c/77515ab12e4983e6416f8c35039a3f0c0822ac70
• https://git.kernel.org/stable/c/d2eaea3599bcce659ce91862254dc91bcbdb6351