CVE-2022-26362

Name: CVE-2022-26362
Creator: NVD / NIST
Published: 2022-06-09T17:15:08.957+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.4/10EPSS 0.38%

Last modified Jun 17, 2026

CVE-2022-26362 is a medium-severity vulnerability rated 6.4/10 on the CVSS scale. x86 pv: Race condition in typeref acquisition 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 0.38% chance of exploitation in the next 30 days.

Description

x86 pv: Race condition in typeref acquisition 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, the logic for acquiring a type reference has a race condition, whereby a safely TLB flush is issued too early and creates a window where the guest can re-establish the read/write mapping before writeability is prohibited.

Metrics

CVSS 3.1

6.4/10

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

EPSS Probability

0.38%

29.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-362

Affected Software

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

References

http://packetstormsecurity.com/files/167718/Xen-TLB-Flush-Bypass.htmlThird Party Advisory, VDB Entry
http://www.openwall.com/lists/oss-security/2022/06/09/3Mailing List, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-401.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-401.txtVendor Advisory
http://packetstormsecurity.com/files/167718/Xen-TLB-Flush-Bypass.htmlThird Party Advisory, VDB Entry
http://www.openwall.com/lists/oss-security/2022/06/09/3Mailing List, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-401.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-401.txtVendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2022-26362?

How severe is CVE-2022-26362?

CVE-2022-26362 has a CVSS score of 6.4/10 (MEDIUM severity). The EPSS model estimates a 0.38% probability of exploitation in the next 30 days.

How do I fix CVE-2022-26362?

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-2022-26362?

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

Scan your code now

Source: NVD / NIST