---
cve: "CVE-2026-43500"
severity: "HIGH"
cvss: 7.8
epss: "92.9%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-05-11 08:16:16"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-06T00:04:38+02:00"
---

# CVE-2026-43500

> 7.8 HIGH

## Beschreibung

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

rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present

The DATA-packet handler in rxrpc_input_call_event() and the RESPONSE
handler in rxrpc_verify_response() copy the skb to a linear one before
calling into the security ops only when skb_cloned() is true.  An skb
that is not cloned but still carries externally-owned paged fragments
(e.g. SKBFL_SHARED_FRAG set by splice() into a UDP socket via
__ip_append_data, or a chained skb_has_frag_list()) falls through to
the in-place decryption path, which binds the frag pages directly into
the AEAD/skcipher SGL via skb_to_sgvec().

Extend the gate to also unshare when skb_has_frag_list() or
skb_has_shared_frag() is true.  This catches the splice-loopback vector
and other externally-shared frag sources while preserving the
zero-copy fast path for skbs whose frags are kernel-private (e.g. NIC
page_pool RX, GRO).  The OOM/trace handling already in place is reused.

## 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 |

## Exploit-Evidenz

- [EDB-52591 — Linux Kernel -  Local Privilege Escalation](https://www.exploit-db.com/exploits/52591)
- [EDB-52585 — Linux Kernel - Local Privilege Escalation](https://www.exploit-db.com/exploits/52585)

## Patch verfügbar (OSV)

- Kernel ≥ 6.6.140
- Kernel ≥ 6.12.88
- Kernel ≥ 6.18.29
- Kernel ≥ 7.0.6

## Referenzen

- <https://git.kernel.org/stable/c/7c504ffab3efce8f7e4f463b314ae31030bdf18b>
- <https://git.kernel.org/stable/c/3711382a77342a9a1c3d2e7330dcfc7ea927f568>
- <https://git.kernel.org/stable/c/3eae0f4f9f7206a4801efa5e0235c25bbd5a412c>
- <https://git.kernel.org/stable/c/d45179f8795222ce858770dc619abe51f9d24411>
- <https://git.kernel.org/stable/c/aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71>
- <https://access.redhat.com/security/cve/CVE-2026-43500>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2468273>
- <https://github.com/V4bel/dirtyfrag>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43500.json>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-43500) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_