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CVE-2026-79608— x86/AMD: ineffectual Zenbleed workaround

Quick assessment

Affected
Xen Xen
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

此前针对 XSA-433（Zenbleed，CVE-2023-20593）的变通方案经过了重新设计，以更好地与其他针对同一 MSR（模型特定寄存器）的操作进行集成。在此次重新设计过程中，引入了一个条件判断取反的逻辑错误，导致该变通方案在需要应用时未能生效，而在不需要应用时却错误地生效。 更多详情请参见： http://xenbits.xen.org/xsa/advisory-433.html

AI Predicted 5.5 Difficulty: Moderate

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Xen Xen consult Xen advisory XSA-515 unknown
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I. Basic Information for CVE-2026-79608

Vulnerability Information
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Vulnerability Title
x86/AMD: ineffectual Zenbleed workaround
Source: CVE Program / CVE List V5
Vulnerability Description
The workaround for XSA-433 (Zenbleed, CVE-2023-20593) was later re-worked to better integrate with other manipulations of the same MSR. In this rework an inverted conditional was introduced, resulting in the workaround to not be applied when needed and vice versa. For more details, see: http://xenbits.xen.org/xsa/advisory-433.html
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Xen Xen consult Xen advisory XSA-515 -

II. Public POCs for CVE-2026-79608

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III. Intelligence Information for CVE-2026-79608

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Vendor Advisories for CVE-2026-79608 (1)

Same Patch Batch · Xen · 2026-10-13 · 8 CVEs total

CVE-2026-102699 Arm: multiple issues with GNTTABOP_cache_flush
CVE-2026-102700 gnttab: cache-flush handling may cause page reference leak
CVE-2026-102702 Arm: multiple issues with GNTTABOP_cache_flush
CVE-2026-79607 Xenstore: Guests can crash xenstored during Live Update
CVE-2026-79611 VMX: VMentry failure with branch tracing and blocked states
CVE-2026-79609 x86: XPTI may break on huge-memory systems
CVE-2026-79610 grant-table: double version change race

IV. Related Vulnerabilities

Same product: Xen
Same vendor: Xen

V. Comments for CVE-2026-79608

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