CVE-2022-23033
First published: Tue Jan 25 2022(Updated: )
arm: guest_physmap_remove_page not removing the p2m mappings The functions to remove one or more entries from a guest p2m pagetable on Arm (p2m_remove_mapping, guest_physmap_remove_page, and p2m_set_entry with mfn set to INVALID_MFN) do not actually clear the pagetable entry if the entry doesn't have the valid bit set. It is possible to have a valid pagetable entry without the valid bit set when a guest operating system uses set/way cache maintenance instructions. For instance, a guest issuing a set/way cache maintenance instruction, then calling the XENMEM_decrease_reservation hypercall to give back memory pages to Xen, might be able to retain access to those pages even after Xen started reusing them for other purposes.
Credit: security@xen.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/xen | 4.11.4+107-gef32c7afa2-1 4.14.6-1 4.14.5+94-ge49571868d-1 4.17.1+2-gb773c48e36-1 4.17.2+55-g0b56bed864-1 | |
| Xen xen-unstable | >=4.12.0 | |
| Fedora | =34 | |
| Debian | =11.0 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2022/01/25/2
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/
- https://security.gentoo.org/glsa/202208-23
- https://www.debian.org/security/2022/dsa-5117
- https://xenbits.xenproject.org/xsa/advisory-393.txt
- https://xenbits.xen.org/xsa/advisory-393.html
- https://security-tracker.debian.org/tracker/CVE-2022-23033
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OMR6UBGJW6JKND7IILGQ2CU35EQPF3E3/
Frequently Asked Questions
What is the severity of CVE-2022-23033?
CVE-2022-23033 is considered a high severity vulnerability due to its potential impact on memory management within the Xen hypervisor.
How do I fix CVE-2022-23033?
To fix CVE-2022-23033, it is recommended to upgrade to a patched version of the Xen hypervisor as specified in the relevant security advisories.
What are the affected versions of Xen for CVE-2022-23033?
Affected versions of Xen for CVE-2022-23033 include versions prior to 4.12.0 as well as specific releases such as 4.11.4+107-gef32c7afa2-1 and 4.14.6-1.
What systems are impacted by CVE-2022-23033?
CVE-2022-23033 impacts various systems running the Xen hypervisor, including Debian, Fedora, and their respective derivatives.
Is there a workaround for CVE-2022-23033?
There is no official workaround for CVE-2022-23033; upgrading to a secure version is the recommended mitigation.
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- source/MITRE
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