---
cve: "CVE-2026-53247"
severity: "CRITICAL"
cvss: 9.8
epss: "47%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-06-25 09:16:42"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T00:43:13+02:00"
---

# CVE-2026-53247

> 9.8 CRITICAL

## Beschreibung

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

net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown

mtk_free_dev() calls metadata_dst_free() which frees the metadata_dst
with kfree() immediately, bypassing the RCU grace period.
In the RX path, skb_dst_set_noref() sets a non-refcounted pointer from
the skb to the metadata_dst. This function requires RCU read-side
protection and the dst must remain valid until all RCU readers complete.
Since metadata_dst_free() calls kfree() directly, a use-after-free can
occur if any skb still holds a noref pointer to the dst when the driver
tears it down.
Replace metadata_dst_free() with dst_release() which properly goes
through the refcount path: when the refcount drops to zero, it schedules
the actual free via call_rcu_hurry(), ensuring all RCU readers have
completed before the memory is freed.

## CVSS-Vektor

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

| 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 | Hoch | bad |

## Patch verfügbar (OSV)

- Kernel ≥ 6.6.143
- Kernel ≥ 6.12.94
- Kernel ≥ 6.18.36
- Kernel ≥ 7.0.13

## Referenzen

- <https://git.kernel.org/stable/c/72775977e89c25c99ee84d2c5baa3f86a8ba5cb4>
- <https://git.kernel.org/stable/c/459c6f35c58cf0fd5247e55d73ddaa29571d9b7e>
- <https://git.kernel.org/stable/c/e634408d2b0cd939cfe019398a21fb47b7a8ffe3>
- <https://git.kernel.org/stable/c/2d86aeb46d5f69c704065a8c69822582787272a1>
- <https://git.kernel.org/stable/c/80df409e1a483676826a6c66e693dba6ac507751>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-53247) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_