CVE-2022-26364
First published: Thu Jun 09 2022(Updated: )
x86 pv: Insufficient care with non-coherent mappings T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Xen maintains a type reference count for pages, in addition to a regular reference count. This scheme is used to maintain invariants required for Xen's safety, e.g. PV guests may not have direct writeable access to pagetables; updates need auditing by Xen. Unfortunately, Xen's safety logic doesn't account for CPU-induced cache non-coherency; cases where the CPU can cause the content of the cache to be different to the content in main memory. In such cases, Xen's safety logic can incorrectly conclude that the contents of a page is safe.
Credit: security@xen.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Xen Xen | ||
| Fedoraproject Fedora | =35 | |
| Fedoraproject Fedora | =36 | |
| Debian Debian Linux | =11.0 | |
| debian/xen | <=4.11.4+107-gef32c7afa2-1 | 4.14.6-1 4.14.5+94-ge49571868d-1 4.17.2+76-ge1f9cb16e2-1~deb12u1 4.17.2+76-ge1f9cb16e2-1 |
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Reference Links
- http://packetstormsecurity.com/files/167710/Xen-PV-Guest-Non-SELFSNOOP-CPU-Memory-Corruption.html
- http://www.openwall.com/lists/oss-security/2022/06/09/4
- http://xenbits.xen.org/xsa/advisory-402.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OH65U6FTTB5MLH5A6Q3TW7KVCGOG4MYI/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RKRXZ4LHGCGMOG24ZCEJNY6R2BTS4S2Q/
- https://security.gentoo.org/glsa/202208-23
- https://www.debian.org/security/2022/dsa-5184
- https://xenbits.xenproject.org/xsa/advisory-402.txt
- https://xenbits.xen.org/xsa/advisory-402.html
- https://security-tracker.debian.org/tracker/CVE-2022-26364
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OH65U6FTTB5MLH5A6Q3TW7KVCGOG4MYI/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RKRXZ4LHGCGMOG24ZCEJNY6R2BTS4S2Q/
Frequently Asked Questions
What is CVE-2022-26364?
CVE-2022-26364 is a vulnerability in Xen that allows for insufficient care with non-coherent mappings.
What software is affected by CVE-2022-26364?
The software affected by CVE-2022-26364 includes Xen, Fedora 35 and 36, and Debian Linux 11.0 with Xen package version up to 4.11.4+107.
What is the severity level of CVE-2022-26364?
The severity level of CVE-2022-26364 is high, with a severity score of 6.7.
How can I fix CVE-2022-26364?
To fix CVE-2022-26364, upgrade to Xen package version 4.14.6-1, 4.14.5+94-ge49571868d-1, 4.17.1+2-gb773c48e36-1, or 4.17.2+55-g0b56bed864-1 on Debian Linux systems.
Where can I find more information about CVE-2022-26364?
You can find more information about CVE-2022-26364 in the advisory from Xen at https://xenbits.xen.org/xsa/advisory-402.html and the Debian Security Tracker at https://security-tracker.debian.org/tracker/CVE-2022-26364.
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