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CVE-2022-26362

Date: June 9, 2022

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.

Severity Score

Related Resources (14)

https://security.alpinelinux.org/vuln/CVE-2022-26362
https://security.gentoo.org/glsa/202208-23
https://nvd.nist.gov/vuln/detail/CVE-2022-26362
http://www.openwall.com/lists/oss-security/2022/06/09/3
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RKRXZ4LHGCGMOG24ZCEJNY6R2BTS4S2Q/
http://packetstormsecurity.com/files/167718/Xen-TLB-Flush-Bypass.html
http://xenbits.xen.org/xsa/advisory-401.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OH65U6FTTB5MLH5A6Q3TW7KVCGOG4MYI/
https://xenbits.xenproject.org/xsa/advisory-401.txt
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RKRXZ4LHGCGMOG24ZCEJNY6R2BTS4S2Q/
https://security-tracker.debian.org/tracker/CVE-2022-26362
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OH65U6FTTB5MLH5A6Q3TW7KVCGOG4MYI/
https://www.debian.org/security/2022/dsa-5184
https://www.mend.io/vulnerability-database/CVE-2022-26362

Severity Score

Weakness Type (CWE)

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CWE-362

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): HIGH
Privileges Required (PR): HIGH
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): COMPLETE
Integrity (I): COMPLETE
Availability (A): COMPLETE
Additional information:

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