What’s Vulnerable › Vulnerabilities

CVE-2026-80991: net: ravb: serialize PTP clock teardown

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-30

Description

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 products

• Linux: 4.2 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0400b9c5608933289bcacc3886dd3e4f6b7695f1
• https://git.kernel.org/stable/c/1cb9663789c5b7a12fcd419fcca6d6254c398252
• https://git.kernel.org/stable/c/66b50c31419e7946e9aa325a468ad9b64c961a25
• https://git.kernel.org/stable/c/67a82e6f886beed0de8f8da08bb767e68fba952d
• https://git.kernel.org/stable/c/695acb5534a9e366efb47b40c7487fc56488b09b
• https://git.kernel.org/stable/c/b917f37bfcce919a969d66a044580a95b11df31c

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