---
cve: "CVE-2026-74634"
severity: "HIGH"
cvss: 7.8
epss: "29.1%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-08-22 16:16:36"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-07T07:26:20+02:00"
---

# CVE-2026-74634

> 7.8 HIGH

## Beschreibung

In the Linux kernel, the following vulnerability has been resolved:

ring-buffer: Prevent subbuf order change when resizing is disabled

Because ring_buffer_subbuf_order_set() frees buffer pages, we can't
allow it when resizing is disabled. A non-consuming reader is at risk of
use-after-free (rb_advance_iter()).

Return -EBUSY on resize_disabled, matching ring_buffer_resize()
behaviour.

## 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 ≥ 6.12.104
- Kernel ≥ 6.18.45
- Kernel ≥ 7.1.9

## Referenzen

- <https://git.kernel.org/stable/c/62978cf6347972c04130e4e841ba404504d92b32>
- <https://git.kernel.org/stable/c/7568e9e717e7540bd05bcc007f5d76fcaff3cdff>
- <https://git.kernel.org/stable/c/b45b91db41379ee5fb36c187d6d7c37b725cbe8e>
- <https://git.kernel.org/stable/c/bf98d7b0d5a99991e47e66cee4eb1d3fa514be97>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-74634) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_