CVE-2026-53222
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk1th percentile — higher than 1% of all known CVEs
Summary
In the Linux kernel, the ptp_ocp driver has a vulnerability due to incorrect resource freeing order. Pin resources are freed before ptp_clock_unregister() is called, leading to a use-after-free condition during driver removal.
Risk Assessment
An attacker could exploit this vulnerability to cause a system panic or potentially escalate privileges by manipulating freed memory during ptp_ocp driver detachment.
Recommendation
Immediately update the Linux kernel to a version containing the fix that reorders free/unregister calls and adds synchronize_irq() for safe PTP device unregistration.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ptp: ocp: fix resource freeing order Commit a60fc3294a37 ("ptp: rework ptp_clock_unregister() to disable events") added a call to ptp_disable_all_events() which changes the configuration of pins if they support EXTTS events. In ptp_ocp_detach() pins resources are freed before ptp_clock_unregister() and it leads to use-after-free during driver removal. Fix it by changing the order of free/unregister calls. To avoid irq handler running on the other core while ptp device unregistering, call synchronize_irq() after HW is configured to stop producing irqs and no irqs are in-flight.