SB20260918318 - Improper input validation in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-90359)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to corrupt function return values.

The vulnerability exists due to improper validation of return value size in BPF return-reading trampolines when attaching a BPF program to a function with a return value larger than 8 bytes. A local privileged user can attach a BPF program using a supported return-reading attach type to corrupt function return values.

Affected attach types include fexit, fmod_ret, fsession, their applicable multi variants, and struct_ops.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/c48796aa6c392cde93946e5d5a9a1f1b1cf72feb
• https://git.kernel.org/stable/c/d36ac53fc83baf843c51b7afd6d2471f36b713d8