---
cve: "CVE-2026-80991"
severity: "HIGH"
cvss: 7.8
epss: "23.3%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-09-11 20:19:05"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-15T08:44:29+02:00"
---

# CVE-2026-80991

> 7.8 HIGH

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- Kernel ≥ 6.12.109
- Kernel ≥ 6.18.50
- Kernel ≥ 7.2.4

## Referenzen

- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-80991) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_