CVEvulnerability
CVE-2022-26362
6.4 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2022-06-09
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 6.4 MEDIUM — CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
- CVSS 2.0 ([email protected])
- 6.9 MEDIUM — AV:L/AC:M/Au:N/C:C/I:C/A:C
- Weaknesses
- CWE-362
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.
Affected configurations
• xen xen
• fedoraproject fedora 35
• fedoraproject fedora 36
• debian debian linux 11.0
Related
Weakness · CWE (1)
- CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization weakness
References
- http://packetstormsecurity.com/files/167718/Xen-TLB-Flush-Bypass.html Third Party Advisory, VDB Entry
- http://www.openwall.com/lists/oss-security/2022/06/09/3 Mailing List, Third Party Advisory
- http://xenbits.xen.org/xsa/advisory-401.html Patch, Vendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OH65U6FTTB5MLH5A6Q3TW7KVCGOG4MYI/ lists.fedoraproject.org
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RKRXZ4LHGCGMOG24ZCEJNY6R2BTS4S2Q/ lists.fedoraproject.org
- https://security.gentoo.org/glsa/202208-23 Third Party Advisory
- https://www.debian.org/security/2022/dsa-5184 Third Party Advisory
- https://xenbits.xenproject.org/xsa/advisory-401.txt Vendor Advisory
- http://packetstormsecurity.com/files/167718/Xen-TLB-Flush-Bypass.html Third Party Advisory, VDB Entry
- http://www.openwall.com/lists/oss-security/2022/06/09/3 Mailing List, Third Party Advisory
- http://xenbits.xen.org/xsa/advisory-401.html Patch, Vendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OH65U6FTTB5MLH5A6Q3TW7KVCGOG4MYI/ lists.fedoraproject.org
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RKRXZ4LHGCGMOG24ZCEJNY6R2BTS4S2Q/ lists.fedoraproject.org
- https://security.gentoo.org/glsa/202208-23 Third Party Advisory
- https://www.debian.org/security/2022/dsa-5184 Third Party Advisory
- https://xenbits.xenproject.org/xsa/advisory-401.txt Vendor Advisory