Bug 2502379 (CVE-2026-63977)

Summary: CVE-2026-63977 kernel: dpll: zl3073x: use __dpll_device_change_ntf() and remove change_work
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Linux kernel's `dpll: zl3073x` module. A race condition can occur during device teardown when a `change_work` operation is re-scheduled after a `cancel_work_sync()` call. This can lead to the system attempting to access a memory location that has been freed or is invalid, potentially causing a system crash and resulting in a denial of service.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-07-19 16:04:53 UTC 
In the Linux kernel, the following vulnerability has been resolved:

dpll: zl3073x: use __dpll_device_change_ntf() and remove change_work

The change_work was introduced to send device change notifications
from DPLL device callbacks without deadlocking on dpll_lock, since
the callbacks are already invoked under that lock. Now that
__dpll_device_change_ntf() is exported for callers that already
hold dpll_lock, use it directly and remove the change_work
infrastructure entirely.

This eliminates a race condition where change_work could be
re-scheduled after cancel_work_sync() during device teardown,
potentially causing the handler to dereference a freed or NULL
dpll_dev pointer.
Comment 1 Keith Grant 2026-07-21 23:13:13 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026071901-CVE-2026-63977-be9d@gregkh/T