SB2026091902 - Race condition in Linux kernel arm64 kernel

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-90212)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

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

The vulnerability exists due to improper handling of voluntary preemption in the arm64 EFI runtime-service handling code when invoking EFI runtime services. A local privileged user can invoke EFI runtime services to cause a denial of service.

The affected configuration requires arm64 software PAN and EFI runtime service support.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/829539c4a650544cb8e5e8690f2c2d0aa2c0e298
• https://git.kernel.org/stable/c/e98a9d0146372b046d863164025a66ab4488b972