CVE-2026-43447
HighSummary
A vulnerability has been identified in the Linux kernel related to use-after-free in the iavf module during reset. This issue arises from improper thread management, which may attempt to access freed resources, leading to system crashes.
Risk Assessment
This vulnerability could lead to system instability and crashes, potentially affecting service availability within the organization. If exploited by an attacker, it could result in significant disruptions to infrastructure operations.
Recommendation
It is recommended to update the Linux kernel to the latest version where fixes for this vulnerability have been implemented. Additionally, monitor systems for unauthorized activities related to adapter resets.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: iavf: fix PTP use-after-free during reset Commit 7c01dbfc8a1c5f ("iavf: periodically cache PHC time") introduced a worker to cache PHC time, but failed to stop it during reset or disable. This creates a race condition where `iavf_reset_task()` or `iavf_disable_vf()` free adapter resources (AQ) while the worker is still running. If the worker triggers `iavf_queue_ptp_cmd()` during teardown, it accesses freed memory/locks, leading to a crash. Fix this by calling `iavf_ptp_release()` before tearing down the adapter. This ensures `ptp_clock_unregister()` synchronously cancels the worker and cleans up the chardev before the backing resources are destroyed.