CVE-2026-80991
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
In the Linux kernel, the ravb Ethernet driver's PTP interrupt handler ravb_ptp_interrupt() can race with ravb_ptp_stop(), passing the clock pointer to ptp_clock_event() while ptp_clock_unregister() is freeing it, leading to a use-after-free. The fix uses READ_ONCE()/WRITE_ONCE() for lockless access, atomically detaches the clock with xchg() before disabling PTP interrupts, and synchronizes IRQs before unregistering.
Risk Assessment
A use-after-free in kernel code can cause system crashes or potentially allow arbitrary code execution with kernel privileges. Systems using Renesas ravb network adapters with PTP enabled are at risk, especially during interface teardown.
Recommendation
Update the Linux kernel to a version containing the fix for this CVE. If immediate update is not possible, consider limiting PTP usage on ravb interfaces until the patch is applied.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS