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CVE-2022-26362

6.4 · MEDIUM

x86 pv: Race condition in typeref acquisition Xen maintains a type reference count for pages, in addition to a regular reference count.

Published Jun 9, 2022CWE-362EPSS 0.38%

Overview

CVE-2022-26362 is a medium-severity vulnerability. It was published on June 9, 2022 and has a CVSS 3.1 base score of 6.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.4, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refpacketstormsecurity.com/files/167718/Xen-TLB-Flush-Bypass.htmlRefwww.openwall.com/lists/oss-security/2022/06/09/3Refxenbits.xen.org/xsa/advisory-401.htmlReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OH65U6FTTB5MLH5A6Q3TW7KVCGOG4MYI/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RKRXZ4LHGCGMOG24ZCEJNY6R2BTS4S2Q/Refsecurity.gentoo.org/glsa/202208-23Refwww.debian.org/security/2022/dsa-5184Refxenbits.xenproject.org/xsa/advisory-401.txtRefpacketstormsecurity.com/files/167718/Xen-TLB-Flush-Bypass.htmlRefwww.openwall.com/lists/oss-security/2022/06/09/3

How CyberStrike helps

Frequently asked questions

What is CVE-2022-26362?

CVE-2022-26362 is a medium-severity vulnerability. It was published on June 9, 2022 and has a CVSS 3.1 base score of 6.4 (MEDIUM).

How severe is CVE-2022-26362?

This vulnerability has a CVSS 3.1 base score of 6.4, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-26362?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-26362?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-26362 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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