SB20260720262 - Race condition in Linux kernel dpll zl3073x driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-63977)

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

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 a race condition in the zl3073x DPLL device change notification handling in drivers/dpll/zl3073x/dpll.c when unregistering a DPLL device during notification processing. A local user can trigger device change notifications during device teardown to cause a denial of service.

The issue could result in dereferencing a freed or NULL dpll_dev pointer.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/d733f519f6443540f8359461a34e3b0042099bbe
• https://git.kernel.org/stable/c/e7a33807fb3f87a855993474ac21684ce105927b