SB2026050259 - Improper input validation in Linux kernel trace

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-43010)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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/E:U/U:Clear

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

The vulnerability exists due to improper input validation in bpf_kprobe_multi_link_attach() when attaching a sleepable kprobe_multi program. A local user can attach a sleepable program that invokes sleepable helpers from a non-sleepable context to cause a denial of service.

The issue is triggered because kprobe.multi programs run in atomic/RCU context and cannot sleep.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/dc9a060d76c12b23c5f378ee115d5e5d03d8bbf3
• https://git.kernel.org/stable/c/eb7024bfcc5f68ed11ed9dd4891a3073c15f04a8
• https://git.kernel.org/stable/c/f952157e695fd434bdc05af63a703bb082a78717