Linux Kernel vhost subsystem Vulnerability Rated 7.4 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-46320

Key Details

CVE	CVE-2026-46320
CVSS Score / Version	7.4 (High) / CVSS v3.1
Updated	2026-10-15
CVSS Vector	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H`
CVSS Prose	attack vector is adjacent; 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)	0.25% probability of exploitation in the next 30 days (16% 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:

tap: free page on error paths in tap_get_user_xdp()

tap_get_user_xdp() rejects a frame shorter than ETH_HLEN with -EINVAL,

and returns -ENOMEM when build_skb() fails. Both paths jump to the err

label without freeing the page that vhost_net_build_xdp() allocated for

the frame. tap_sendmsg() discards the per-buffer return value and always

returns 0, so vhost_tx_batch() takes the success path and never frees

the page; each rejected frame in a batch leaks one page-frag chunk.

Free the page on both error paths, before the skb is built. This is the

tap counterpart of the same leak in tun_xdp_one(). (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-46320
CVE	https://www.cve.org/CVERecord?id=CVE-2026-46320

Source

Reference

NVD

CVE