CVE-2026-80991

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxa0d2f20650e81407d8e51ad2cbdc492861c74e9c < 695acb5534a9e366efb47b40c7487fc56488b09baffected
LinuxLinuxa0d2f20650e81407d8e51ad2cbdc492861c74e9c < 67a82e6f886beed0de8f8da08bb767e68fba952daffected
LinuxLinuxa0d2f20650e81407d8e51ad2cbdc492861c74e9c < 66b50c31419e7946e9aa325a468ad9b64c961a25affected
LinuxLinuxa0d2f20650e81407d8e51ad2cbdc492861c74e9c < 1cb9663789c5b7a12fcd419fcca6d6254c398252affected
LinuxLinux4.2affected
LinuxLinux0 < 4.2unaffected
LinuxLinux6.12.109 <= 6.12.*unaffected
LinuxLinux6.18.50 <= 6.18.*unaffected
LinuxLinux7.2.4 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References