Linux Linux Kernel Vulnerability Exposed to Unauthenticated Network Attackers

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-31676

Key Details

CVE	CVE-2026-31676
CVSS Score / Version	7.5 (High) / CVSS v3.1
Updated	2026-10-15
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; 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)	0.83% probability of exploitation in the next 30 days (57% 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:

rxrpc: only handle RESPONSE during service challenge

Only process RESPONSE packets while the service connection is still in

RXRPC_CONN_SERVICE_CHALLENGING. Check that state under state_lock before

running response verification and security initialization, then use a local

secured flag to decide whether to queue the secured-connection work after

the state transition. This keeps duplicate or late RESPONSE packets from

re-running the setup path and removes the unlocked post-transition state

test. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-31676
CVE	https://www.cve.org/CVERecord?id=CVE-2026-31676

Source

Reference

NVD

CVE