---
cve: "CVE-2023-53566"
severity: "HIGH"
cvss: 7.8
epss: "14%"
vendor: "Linux"
kev: false
exploited: false
published: "2025-10-04 16:15:52"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-11T05:22:03+02:00"
---

# CVE-2023-53566

> 7.8 HIGH

## Beschreibung

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

netfilter: nft_set_rbtree: fix null deref on element insertion

There is no guarantee that rb_prev() will not return NULL in nft_rbtree_gc_elem():

general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
 nft_add_set_elem+0x14b0/0x2990
  nf_tables_newsetelem+0x528/0xb30

Furthermore, there is a possible use-after-free while iterating,
'node' can be free'd so we need to cache the next value to use.

## 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 ≥ 5.10.181
- Kernel ≥ 5.15.113
- Kernel ≥ 6.1.30
- Kernel ≥ 6.3.4

## Referenzen

- <https://git.kernel.org/stable/c/b76db53ee8802ee5683f8cb401d7e2ec6f9b3d56>
- <https://git.kernel.org/stable/c/899aa5638568abf5d69de7a7bb95e4615157375b>
- <https://git.kernel.org/stable/c/3fa13203b6d90cc3a33af47b058739f92ab82eef>
- <https://git.kernel.org/stable/c/ec5caa765f7f6960011c919c9aeb1467940421f6>
- <https://git.kernel.org/stable/c/a836be60a3aabcedcd9c79f545d409ace1f20ba6>
- <https://git.kernel.org/stable/c/a337706c1fb35aac3f26b48aca80421bdbe1d33a>
- <https://git.kernel.org/stable/c/61ae320a29b0540c16931816299eb86bf2b66c08>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2023-53566) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_