CVE-2026-46174

x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache

HIGH
8.8
CVSS Score
Published: May 28, 2026 at 09:36 AM UTC
Updated: October 19, 2026 at 08:18 PM UTC
4 products affected across 2 vendorsLinux KernelSIMATIC S7-1500 CPU 1518-4 Pn /dp MFP FirmwareSiplus S7-1500 CPU 1518-4 Pn /dp MFP Firmware

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Severity
HIGH8.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

In the Linux kernel, the following vulnerability has been resolved: x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache Make sure resources are not improperly shared in the op cache and cause instruction corruption this way.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

3.16.58 ≤ v < 3.174.14.1 ≤ v < 5.10.2564.4.144 ≤ v < 4.54.9.102 ≤ v < 4.105.11 ≤ v < 5.15.2075.16 ≤ v < 6.1.1736.13 ≤ v < 6.18.306.19 ≤ v < 7.0.76.2 ≤ v < 6.6.1396.7 ≤ v < 6.12.883.16.584.144.14 rc24.14 rc34.14 rc44.14 rc54.14 rc64.14 rc74.14 rc84.4.1444.9.1024ba461d426490b6ed7e8298c4d3b7a13aa5d26865a63725cd18fcee2af6ec46ccb856b64ad3077b45abd1583e06b3963e5c9d915760367de86808b787.17.1 rc17.1 rc27.1 rc3f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9
Vendor states this is fixed in 1cd85a19748b2407830376a5cbae5c0f126016e5 (fixed)
Vendor states this is fixed in 1e23b30a80b14e5764657401ee2cca030525ae8e (fixed)
Vendor states this is fixed in 251497955f2314cd39d43191e81c6151dead4c7b (fixed)
Vendor states this is fixed in 28f5ed477eef166d678d6966762cbc1de9b4f436 (fixed)
Vendor states this is fixed in 9109489cc8c34e50d15575a3d1ff82af586bc1aa (fixed)
Vendor states this is fixed in c21b90f77687075115d989e53a8ec5e2bb427ab1 (fixed)
Vendor states this is fixed in f5bc3aef7df46eaaf423d7413ab8833f704ae576 (fixed)
Vendor states this is fixed in ff6fc65b3bf73acc5ee71919154d830ad5431362 (fixed)
Affected range stops below 3.17, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.10, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 4.14 (unaffected)
Affected range stops below 4.5, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 5.10.256 (unaffected)
Vendor states this is fixed in 5.15.207 (unaffected)
Vendor states this is fixed in 6.1.173 (unaffected)
Vendor states this is fixed in 6.12.88 (unaffected)
Vendor states this is fixed in 6.18.30 (unaffected)
Vendor states this is fixed in 6.6.139 (unaffected)
Vendor states this is fixed in 7.0.7 (unaffected)
Vendor states this is fixed in 7.1 (unaffected)

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHLinux
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfoCWE-862

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