CVE-2022-26363

Name: CVE-2022-26363
Creator: NVD / NIST
Published: 2022-06-09T17:15:08.997+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.7/10EPSS 0.34%

Last modified Jun 17, 2026

CVE-2022-26363 is a medium-severity vulnerability rated 6.7/10 on the CVSS scale. 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. EPSS estimates a 0.34% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.7/10

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.34%

25.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Xen	Xen	All versions
Fedoraproject	Fedora	35
Fedoraproject	Fedora	36
Debian	Debian Linux	11.0

References

http://www.openwall.com/lists/oss-security/2022/06/09/4Mailing List, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-402.htmlPatch, Vendor Advisory
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/
https://security.gentoo.org/glsa/202208-23Third Party Advisory
https://www.debian.org/security/2022/dsa-5184Third Party Advisory
https://xenbits.xenproject.org/xsa/advisory-402.txtVendor Advisory
http://www.openwall.com/lists/oss-security/2022/06/09/4Mailing List, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-402.htmlPatch, Vendor Advisory
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/
https://security.gentoo.org/glsa/202208-23Third Party Advisory
https://www.debian.org/security/2022/dsa-5184Third Party Advisory
https://xenbits.xenproject.org/xsa/advisory-402.txtVendor Advisory

Timeline

Published: Jun 9, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-26363?

How severe is CVE-2022-26363?

CVE-2022-26363 has a CVSS score of 6.7/10 (MEDIUM severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.

How do I fix CVE-2022-26363?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-26363?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST