SB20260815225 - Improper input validation in Linux kernel trace

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-74258)

CWE-ID: CWE-20 - Improper input validation

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 input validation in bpf_uprobe_multi_link_attach in kernel/trace/bpf_trace.c when processing user-supplied uprobe_multi array pointers. A local user can supply crafted user-space pointers to trigger a kernel fault and cause a denial of service.

The issue involves missing bounds validation with access_ok before __get_user accesses user-space data.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/4d87a251d45b4a95eb4c0abcfab809c9f231258a
• https://git.kernel.org/stable/c/c6d51ad36490013ee9df94a372d3bf794bd304d1