---
cve: "CVE-2026-46207"
severity: "LOW"
cvss: 3.1
epss: "13%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-05-28 10:16:36"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-11T00:27:24+02:00"
---

# CVE-2026-46207

> 3.1 LOW

## Beschreibung

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

vsock/virtio: fix empty payload in tap skb for non-linear buffers

For non-linear skbs, virtio_transport_build_skb() goes through
virtio_transport_copy_nonlinear_skb() to copy the original payload
in the new skb to be delivered to the vsockmon tap device.
This manually initializes an iov_iter but does not set iov_iter.count.
Since the iov_iter is zero-initialized, the copy length is zero and no
payload is actually copied to the monitor interface, leaving data
un-initialized.

Fix this by removing the linear vs non-linear split and using
skb_copy_datagram_iter() with iov_iter_kvec() for all cases, as
vhost-vsock already does. This handles both linear and non-linear skbs,
properly initializes the iov_iter, and removes the now unused
virtio_transport_copy_nonlinear_skb().

While touching this code, let's also check the return value of
skb_copy_datagram_iter(), even though it's unlikely to fail.

## Patch verfügbar (OSV)

- Kernel ≥ 6.12.90
- Kernel ≥ 6.18.32
- Kernel ≥ 7.0.9

## Referenzen

- <https://git.kernel.org/stable/c/06747f52ab157591cec7e5623a759473b66ef6f6>
- <https://git.kernel.org/stable/c/52da6a74ca3de0fcda60301096b71534b3b18641>
- <https://git.kernel.org/stable/c/378b131a25bd1a5ee27ca199fe486c299d5350c5>
- <https://git.kernel.org/stable/c/3a3e3d90cbc79600544536723911657730759af3>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-46207) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_