net: ravb: serialize PTP clock teardown

Answer in brief

CVE-2026-80991 records a Unknown severity vulnerability in net: ravb: serialize PTP clock teardown. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=a0d2f20650e81407d8e51ad2cbdc492861c74e9c <695acb5534a9e366efb47b40c7487fc56488b09b \|\| >=a0d2f20650e81407d8e51ad2cbdc492861c74e9c <67a82e6f886beed0de8f8da08bb767e68fba952d \|\| >=a0d2f20650e81407d8e51ad2cbdc492861c74e9c <66b50c31419e7946e9aa325a468ad9b64c961a25 \|\| >=a0d2f20650e81407d8e51ad2cbdc492861c74e9c <1cb9663789c5b7a12fcd419fcca6d6254c398252	695acb5534a9e366efb47b40c7487fc56488b09b, 67a82e6f886beed0de8f8da08bb767e68fba952d, 66b50c31419e7946e9aa325a468ad9b64c961a25, 1cb9663789c5b7a12fcd419fcca6d6254c398252
Linux/Linuxgeneric	4.2	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 695acb5534a9e366efb47b40c7487fc56488b09b if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.