Use-after-free Vulnerability in Xen's x86 Shadow and Log-Dirty Mode
CVE-2022-42332

7.8HIGH

Key Information:

Vendor

Xen Project
Status
Xen Project
Vendor
CVE Published:
21 March 2023

What is CVE-2022-42332?

In certain environments where Hardware Assisted Paging (HAP) is not available, the Xen Hypervisor operates in shadow mode, which relies on a memory pool for shadow page tables and auxiliary structures. During migration or snapshot processes, it also utilizes log-dirty mode for memory allocation tracking. However, the Xen architecture fails to properly account for memory demands of the log-dirty infrastructure when establishing new shadow page tables. Consequently, these tables may be prematurely freed while still being accessed by other operations, leading to potential memory corruption and instability.

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Deploy the Patch

Affected Version(s)

xen consult Xen advisory XSA-427

References

https://xenbits.xenproject.org/xsa/advisory-427.txt
http://xenbits.xen.org/xsa/advisory-427.html
http://www.openwall.com/lists/oss-security/2023/03/21/1
mailing-list

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

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