What happened
In the Linux kernel, the following vulnerability has been resolved: net: ravb: serialize PTP clock teardown ravb_ptp_interrupt() can race with ravb_ptp_stop() and pass the clock to ptp_clock_event() while ptp_clock_unregister() is freeing it. This can lead to a use-after-free. Use READ_ONCE() and WRITE_ONCE() for lockless access to the clock pointer. Atomically detach it with xchg() before disabling PTP interrupts, then synchronize all IRQs which can invoke ravb_ptp_interrupt() before unregistering the detached clock. A handler which read the old pointer completes before the clock is unregistered, while later handlers read NULL and skip the event.
Affected versions
Linux: a0d2f20650e81407d8e51ad2cbdc492861c74e9c through before 695acb5534a9e366efb47b40c7487fc56488b09b (git); a0d2f20650e81407d8e51ad2cbdc492861c74e9c through before 67a82e6f886beed0de8f8da08bb767e68fba952d (git); a0d2f20650e81407d8e51ad2cbdc492861c74e9c through before 66b50c31419e7946e9aa325a468ad9b64c961a25 (git); a0d2f20650e81407d8e51ad2cbdc492861c74e9c through before 1cb9663789c5b7a12fcd419fcca6d6254c398252 (git); 4.2 Fixed: See vendor advisory.
Why it matters
Review the vendor advisory and exposure of the affected product to determine operational impact.
Detection & mitigation
- Apply vendor-provided updates or mitigations.
- Review affected product exposure and access logs.
Public PoC references
No public PoC reference has passed the current publication threshold.