---
cve: "CVE-2026-72320"
severity: "CRITICAL"
cvss: 9.1
epss: "52%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-08-15 06:22:04"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-03T02:22:41+02:00"
---

# CVE-2026-72320

> 9.1 CRITICAL

## Beschreibung

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

netfilter: nft_lookup: fix catchall element handling with inverted lookups

nft_lookup_eval() decides whether a lookup matched (`found`) from the
direct set lookup and priv->invert before falling back to the
catchall element used by interval sets (e.g. nft_set_rbtree) for the
open-ended default range. Since `found` is never recomputed after
`ext` is replaced by the catchall lookup, inverted lookups
(NFT_LOOKUP_F_INV, "!= @set") can wrongly match or wrongly skip the
catchall element, producing the wrong verdict. Fold the catchall
lookup into `ext` before computing `found`, matching the order
already used by nft_objref_map_eval().

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Keine | good |

## Patch verfügbar (OSV)

- Kernel ≥ 6.12.97
- Kernel ≥ 6.18.40
- Kernel ≥ 7.1.5

## Referenzen

- <https://git.kernel.org/stable/c/0ab8880865f9678eb6174e72c1fc4712e44c745c>
- <https://git.kernel.org/stable/c/238c612357b5a25f03eacf356f95034f8551f218>
- <https://git.kernel.org/stable/c/ef0c7d4b04a0e6ad175323c24bc84e11470dd79d>
- <https://git.kernel.org/stable/c/e6107a4c74b54cb33e3bce162a63048ae5a6b198>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-72320) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_