# CVE-2026-46174: x86/CPU/AMD: Prevent improper isolation of shared resources in Zen2's op cache

Status: published. Published: 2026-05-28. Updated: 2026-11-10.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9; < 1e23b30a80b14e5764657401ee2cca030525ae8e (affected, git); ≥ f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9; < f5bc3aef7df46eaaf423d7413ab8833f704ae576 (affected, git); ≥ f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9; < 251497955f2314cd39d43191e81c6151dead4c7b (affected, git); ≥ f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9; < ff6fc65b3bf73acc5ee71919154d830ad5431362 (affected, git); ≥ f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9; < 9109489cc8c34e50d15575a3d1ff82af586bc1aa (affected, git); ≥ f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9; < 28f5ed477eef166d678d6966762cbc1de9b4f436 (affected, git); ≥ f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9; < 1cd85a19748b2407830376a5cbae5c0f126016e5 (affected, git); ≥ f7f3dc00f61261cdc9ccd8b886f21bc4dffd6fd9; < c21b90f77687075115d989e53a8ec5e2bb427ab1 (affected, git); 5abd1583e06b3963e5c9d915760367de86808b78 (affected, git); 4ba461d426490b6ed7e8298c4d3b7a13aa5d2686 (affected, git); 5a63725cd18fcee2af6ec46ccb856b64ad3077b4 (affected, git); ≥ 3.16.58; < 3.17 (affected, semver); ≥ 4.4.144; < 4.5 (affected, semver); ≥ 4.9.102; < 4.10 (affected, semver). Source: CNA: Linux
- Linux / Linux: 4.14 (affected); ≥ 0; < 4.14 (unaffected, semver); ≥ 5.10.256; ≤ 5.10.* (unaffected, semver); ≥ 5.15.207; ≤ 5.15.* (unaffected, semver); ≥ 6.1.173; ≤ 6.1.* (unaffected, semver); ≥ 6.6.139; ≤ 6.6.* (unaffected, semver); ≥ 6.12.88; ≤ 6.12.* (unaffected, semver); ≥ 6.18.30; ≤ 6.18.* (unaffected, semver); ≥ 7.0.7; ≤ 7.0.* (unaffected, semver); ≥ 7.1; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0): ≥ V3.1.5; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0): ≥ V3.1.5; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0): ≥ V3.1.5; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0): ≥ V3.1.5; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0): ≥ V3.1.5; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP

## Severity and prioritization

- CVSS 3.1: 8.8 (high); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H; source: CNA: Linux

- CISA KEV: No listing in collected sources

- EPSS: 0.15% as of 2026-11-09; percentile 4.46%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-862

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/1e23b30a80b14e5764657401ee2cca030525ae8e (CNA: Linux)

- https://git.kernel.org/stable/c/f5bc3aef7df46eaaf423d7413ab8833f704ae576 (CNA: Linux)

- https://git.kernel.org/stable/c/251497955f2314cd39d43191e81c6151dead4c7b (CNA: Linux)

- https://git.kernel.org/stable/c/ff6fc65b3bf73acc5ee71919154d830ad5431362 (CNA: Linux)

- https://git.kernel.org/stable/c/9109489cc8c34e50d15575a3d1ff82af586bc1aa (CNA: Linux)

- https://git.kernel.org/stable/c/28f5ed477eef166d678d6966762cbc1de9b4f436 (CNA: Linux)

- https://git.kernel.org/stable/c/1cd85a19748b2407830376a5cbae5c0f126016e5 (CNA: Linux)

- https://git.kernel.org/stable/c/c21b90f77687075115d989e53a8ec5e2bb427ab1 (CNA: Linux)

- https://cert-portal.siemens.com/productcert/html/ssa-082556.html (ADP: siemens-SADP)

- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (ADP: siemens-SADP)

- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (ADP: siemens-SADP)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-46174; retrieved 2026-11-10; source updated 2026-11-10

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-46174; retrieved 2026-11-10; source updated Not reported

Revision: 8a98d35f308ba83b146e49825f7dbc75999d9981e31521fffcffbab4796ae790

Canonical: https://y2.dev/cve/CVE-2026-46174

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