In the Linux kernel, the following vulnerability has been resolved: dpll: zl3073x: use __dpll_device_change_ntf() and remove change_work The… (CVE-2026-63977)
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.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel's dpll zl3073x driver involved a race condition caused by the change_work mechanism used to send device change notifications. Because callbacks were invoked under the dpll_lock, change_work was introduced to avoid deadlocks. However, this mechanism could be rescheduled after cancel_work_sync() during device teardown, leading to possible dereferencing of freed or NULL dpll_dev pointers. The fix replaces change_work with direct calls to the exported __dpll_device_change_ntf() function for callers already holding dpll_lock, eliminating the race condition and removing the change_work infrastructure.
Potential Impact
If exploited, this race condition could cause the kernel to dereference freed or NULL pointers, potentially leading to kernel crashes or undefined behavior. No known exploits in the wild have been reported.
Mitigation Recommendations
A fix has been implemented in the Linux kernel by removing the change_work mechanism and using __dpll_device_change_ntf() directly. Users should update to the Linux kernel version that includes this fix once available. Patch status is not yet confirmed; check the vendor advisory for current remediation guidance.
In the Linux kernel, the following vulnerability has been resolved: dpll: zl3073x: use __dpll_device_change_ntf() and remove change_work The… (CVE-2026-63977)
Description
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.
CVSS v3.1
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in the Linux kernel's dpll zl3073x driver involved a race condition caused by the change_work mechanism used to send device change notifications. Because callbacks were invoked under the dpll_lock, change_work was introduced to avoid deadlocks. However, this mechanism could be rescheduled after cancel_work_sync() during device teardown, leading to possible dereferencing of freed or NULL dpll_dev pointers. The fix replaces change_work with direct calls to the exported __dpll_device_change_ntf() function for callers already holding dpll_lock, eliminating the race condition and removing the change_work infrastructure.
Potential Impact
If exploited, this race condition could cause the kernel to dereference freed or NULL pointers, potentially leading to kernel crashes or undefined behavior. No known exploits in the wild have been reported.
Mitigation Recommendations
A fix has been implemented in the Linux kernel by removing the change_work mechanism and using __dpll_device_change_ntf() directly. Users should update to the Linux kernel version that includes this fix once available. Patch status is not yet confirmed; check the vendor advisory for current remediation guidance.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-665c-mwm9-rw7p
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-63977"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a5d27aa2a4a8d598912e242
Added to database: 07/19/2026, 19:38:18 UTC
Last enriched: 07/19/2026, 20:02:52 UTC
Last updated: 07/20/2026, 21:51:56 UTC
Views: 11
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