---
cve: "CVE-2026-64266"
severity: "HIGH"
cvss: 7.8
epss: "16%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-07-25 10:17:06"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-19T19:57:57+02:00"
---

# CVE-2026-64266

> 7.8 HIGH

## Beschreibung

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

fuse: re-lock request before returning from fuse_ref_folio()

fuse_ref_folio() unlocks the request but does not re-lock it before
returning. fuse_chan_abort() can end the request and the async end
callback (eg fuse_writepage_free()) can free the args while the
subsequent copy chain logic after fuse_ref_folio() accesses them,
leading to use-after-free issues.

Fix this by locking the request in fuse_ref_folio() before returning.

## 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 ≥ 5.10.261
- Kernel ≥ 5.15.212
- Kernel ≥ 6.1.178
- Kernel ≥ 6.6.145
- Kernel ≥ 6.12.96
- Kernel ≥ 6.18.39
- Kernel ≥ 7.1.4

## Referenzen

- <https://git.kernel.org/stable/c/1f9156714592356b4fda57beac7eab9c2a462dd3>
- <https://git.kernel.org/stable/c/5630da218a45ba80f0aba0846cbe8aa655da122b>
- <https://git.kernel.org/stable/c/1ca605cfa59377f0143fb35b5b01360f37d1b7c4>
- <https://git.kernel.org/stable/c/0e4a5a000123d81234e27a2f8187688cf608f755>
- <https://git.kernel.org/stable/c/e6aa539720c3d8def69683ed0c07cf9faea4e8be>
- <https://git.kernel.org/stable/c/be353caffa8640f5e25fb3714ce8b0cef5e410e5>
- <https://git.kernel.org/stable/c/65a1c2551f7e16085acbb54aedde1feaa559ba7a>
- <https://git.kernel.org/stable/c/b5befa80fdbe287a98480effed9564712924add5>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-64266) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_