Insufficient TLB Flush in Xen for x86 PV Guests in Shadow Mode
CVE-2022-33745

8.8HIGH

Key Information:

Vendor

Xen Project
Status
Xen
Vendor
CVE Published:
26 July 2022

What is CVE-2022-33745?

The vulnerability arises from an insufficient Translation Lookaside Buffer (TLB) flush condition for x86 ParaVirtualization (PV) guests operating in a shadow mode. This issue is triggered during guest migration and occurs due to the movement of code inside the Xen hypervisor, which inadvertently altered the meaning of a crucial variable. Consequently, the faulty usage of this variable fails to ensure necessary TLB flushes, potentially allowing unprivileged access to sensitive data through improper memory management in virtualized environments.

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Deploy the Patch

Affected Version(s)

xen consult Xen advisory XSA-408

References

https://xenbits.xenproject.org/xsa/advisory-408.txt
http://xenbits.xen.org/xsa/advisory-408.html
http://www.openwall.com/lists/oss-security/2022/07/26/2
mailing-list

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

{'credit_data': {'description': {'description_data': [{'lang': 'eng', 'value': 'This issue was discovered by Charles Arnold of SUSE.'}]}}}
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