Linux Kernel vhost subsystem Vulnerability Rated 7.1 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-46322

Key Details

CVE	CVE-2026-46322
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 build_skb failure in tun_xdp_one()

When build_skb() fails in tun_xdp_one(), the function sets ret to

-ENOMEM and jumps to the out label, which returns without freeing the

page that vhost_net_build_xdp() allocated for the frame. As with the

short-frame rejection path, tun_sendmsg() discards the per-buffer error

and still returns total_len, so vhost_tx_batch() takes the success path

and never frees the page. Each build_skb() failure in a batch leaks one

page-frag chunk.

Free the page before taking the error path, matching the put_page() the

other error exits of tun_xdp_one() already perform. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-46322
CVE	https://www.cve.org/CVERecord?id=CVE-2026-46322

Source

Reference

NVD

CVE