---
cve: "CVE-2026-43494"
severity: "HIGH"
cvss: 7.8
epss: "30%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-05-21 10:49:21"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-06T17:07:58+02:00"
---

# CVE-2026-43494

> 7.8 HIGH · 🧪 PoC

## Beschreibung

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

net/rds: reset op_nents when zerocopy page pin fails

When iov_iter_get_pages2() fails in rds_message_zcopy_from_user(),
the pinned pages are released with put_page(), and
rm->data.op_mmp_znotifier is cleared.  But we fail to properly
clear rm->data.op_nents.

Later when rds_message_purge() is called from rds_sendmsg() the
cleanup loop iterates over the incorrectly non zero number of
op_nents and frees them again.

Fix this by properly resetting op_nents when it should be in
rds_message_zcopy_from_user().

## 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 ≥ 5.10.258
- Kernel ≥ 5.15.209
- Kernel ≥ 6.1.175
- Kernel ≥ 6.6.141
- Kernel ≥ 6.12.91
- Kernel ≥ 6.18.33
- Kernel ≥ 7.0.10

## Referenzen

- <https://git.kernel.org/stable/c/c6e51512a784c4a7b86e1a044988696e3b3721fa>
- <https://git.kernel.org/stable/c/03014551938a0887fa55f18ce49b70158a9c0113>
- <https://git.kernel.org/stable/c/d84ce1786ce40fdd3dd98db47aec5527817e1ef6>
- <https://git.kernel.org/stable/c/9115669faedccdda100428e2d26fd0aac8c50799>
- <https://git.kernel.org/stable/c/0bbbff00a15b1df2cac9014d6cf4b6890f473353>
- <https://git.kernel.org/stable/c/640e37f58f991546a87540d067279c2c1fa9fe51>
- <https://git.kernel.org/stable/c/290e833d1acb1093bc121fcdc97f5e6161157479>
- <https://git.kernel.org/stable/c/e174929793195e0cd6a4adb0cad731b39f9019b4>
- <https://github.com/v12-security/pocs/tree/main/pintheft>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-43494) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_