---
cve: "CVE-2026-72347"
severity: "HIGH"
cvss: 7.3
epss: "17%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-08-15 06:22:08"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-08T22:55:17+02:00"
---

# CVE-2026-72347

> 7.3 HIGH

## Beschreibung

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

netfilter: xt_connmark: reject invalid shift parameters

Revision 2 of the CONNMARK target accepts user-controlled shift
parameters and applies them to 32-bit mark values in
connmark_tg_shift().

A shift_bits value of 32 or more triggers an undefined-shift bug when
the rule is evaluated. Invalid shift_dir values are also accepted and
silently fall back to the left-shift path.

Reject invalid revision-2 shift parameters in connmark_tg_check() so
malformed rules fail at installation time, before they can reach the
packet path.

## CVSS-Vektor

```
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/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 | Gering | warn |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- Kernel ≥ 5.15.212
- Kernel ≥ 6.1.178
- Kernel ≥ 6.6.145
- Kernel ≥ 6.12.97
- Kernel ≥ 6.18.40
- Kernel ≥ 7.1.5

## Referenzen

- <https://git.kernel.org/stable/c/d8ce63d928b457fba7ed1e302492dfd32293671c>
- <https://git.kernel.org/stable/c/9657bb11a6376ab0a79f05d433713d6944111e9d>
- <https://git.kernel.org/stable/c/8ace320ac4416f5e5fbcd065309fb2dfcce787b0>
- <https://git.kernel.org/stable/c/c3fa852d117b3fda72265e4230e3967db4a74fcf>
- <https://git.kernel.org/stable/c/4eef84b09a3836919360c4232b0f16651a155eec>
- <https://git.kernel.org/stable/c/230173cc6105bdfb2696d37e6e56687b003fbe63>
- <https://git.kernel.org/stable/c/1b47026fb4b35bac850ad6e8a4ad7fc018e09ebc>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-72347) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_