Critical Linux Kernel kernel crypto subsystem Vulnerability Scores 9.8 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-43493

Key Details

CVE	CVE-2026-43493
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-15
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel and Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Exploitation prediction (EPSS)	0.62% probability of exploitation in the next 30 days (49% 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:

crypto: pcrypt - Fix handling of MAY_BACKLOG requests

MAY_BACKLOG requests can return EBUSY. Handle them by checking

for that value and filtering out EINPROGRESS notifications. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-43493
CVE	https://www.cve.org/CVERecord?id=CVE-2026-43493

Source

Reference

NVD

CVE