SB20260816513 - Improper control of a resource through its lifetime in Linux kernel arm64 kernel

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-72016)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

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 state management in cpuhp_smt_enable() and CPU present-mask handling when processing CPU hotplug operations on arm64 ACPI systems with CPUs marked present before registration. A local user can trigger SMT hotplug control on such a system to cause a denial of service.

The issue occurs on arm64 systems booted with ACPI where some CPUs are enumerated as online-capable but are not enabled and have not yet been registered.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/901a489d89ee9c854624c8444090e38e70aed234
• https://git.kernel.org/stable/c/ccdf1770a4ba27e31599d24ad970d77a371c7912
• https://git.kernel.org/stable/c/f9a82544c7174851f5c7524622f5966dcafd3a47