Linux Kernel virtio driver Vulnerability Rated 7.1 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-46321

Key Details

CVE	CVE-2026-46321
CVSS Score / Version	7.1 (High) / CVSS v3.1
Updated	2026-10-15
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is none; user interaction is none; scope is changed; confidentiality impact is none; integrity impact is none; availability impact is high.
Affected products	Linux Kernel and Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Exploitation prediction (EPSS)	0.13% probability of exploitation in the next 30 days (3% percentile) -- FIRST.org's EPSS model.

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel
Siemens	SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Siemens

SIMATIC S7-1500 TM MFP - GNU/Linux subsystem

Subsystems	Controllers & Field I/O, OT Supporting Infrastructure
Sectors	All Sectors

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

tun: free page on short-frame rejection in tun_xdp_one()

tun_xdp_one() returns -EINVAL on a frame shorter than ETH_HLEN without

freeing the page that vhost_net_build_xdp() allocated for it.

tun_sendmsg() discards that -EINVAL and still returns total_len, so

vhost_tx_batch() takes the success path and never frees the page; each

short frame in a batch leaks one page-frag chunk.

A local process that can open /dev/net/tun and /dev/vhost-net can hit

this path: it attaches a tun/tap device as the vhost-net backend and

feeds TX descriptors whose length minus the virtio-net header is below

ETH_HLEN. Each kick leaks the page-frag chunks for that batch, and a

tight submission loop exhausts host memory and triggers an OOM panic.

Free the page before returning -EINVAL, matching the XDP-program error

path in the same function. (NVD)

Monitor Linux's and Siemens's web pages for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-46321
CVE	https://www.cve.org/CVERecord?id=CVE-2026-46321

Source

Reference

NVD

CVE