SB2026082862 - Improper access control in Linux kernel io_uring

Description

This security bulletin contains information about 1 vulnerability.

1) Improper access control (CVE-ID: CVE-2026-80713)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to bypass io_uring restrictions.

The vulnerability exists due to improper access control in the io_uring task restriction handling when a process performs an exec after previously using io_uring. A local user can execute a program and create a new io_uring ring after exec to bypass io_uring restrictions.

The issue occurs because the exec cancellation path releases the per-task restriction while preserving the ability to create a ring afterward.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/bc0e8faf90e776a2f1f3967a04e8091e6bdb4977
• https://git.kernel.org/stable/c/fcef9325afeecced693a7438e975e4a3f8e2716f