CVE-2022-42335: Null Pointer Dereference
First published: Tue Apr 25 2023(Updated: )
x86 shadow paging arbitrary pointer dereference In environments where host assisted address translation is necessary but Hardware Assisted Paging (HAP) is unavailable, Xen will run guests in so called shadow mode. Due to too lax a check in one of the hypervisor routines used for shadow page handling it is possible for a guest with a PCI device passed through to cause the hypervisor to access an arbitrary pointer partially under guest control.
Credit: security@xen.org security@xen.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Xen Xen | =4.17.0 | |
| Fedoraproject Fedora | =38 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2023/04/25/1
- http://xenbits.xen.org/xsa/advisory-430.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PSPFWSY6UOPGMADQGOGN2PAAS5LJRPTG/
- https://xenbits.xenproject.org/xsa/advisory-430.txt
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PSPFWSY6UOPGMADQGOGN2PAAS5LJRPTG/
- https://security.gentoo.org/glsa/202402-07
Frequently Asked Questions
What is CVE-2022-42335?
CVE-2022-42335 is a vulnerability in Xen where guests running in shadow mode can trigger an arbitrary pointer dereference due to a lax check in one of the hypervisor routines used for shadow page handling.
How does CVE-2022-42335 impact Xen?
CVE-2022-42335 can allow guests to exploit Xen and potentially execute arbitrary code.
Which software versions are affected by CVE-2022-42335?
Xen version 4.17.0 and Fedora version 38 are affected by CVE-2022-42335.
What is the severity of CVE-2022-42335?
The severity of CVE-2022-42335 is high with a CVSS score of 7.8.
How can I fix CVE-2022-42335?
To fix CVE-2022-42335, it is recommended to apply the patches and updates provided by Xen and Fedora.
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