Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Xen | Xen | All versions |
| Fedoraproject | Fedora | 35 |
| Debian | Debian Linux | 11.0 |
Related Weaknesses (CWE)
References
- http://packetstormsecurity.com/files/167718/Xen-TLB-Flush-Bypass.htmlThird Party AdvisoryVDB Entry
- http://www.openwall.com/lists/oss-security/2022/06/09/3Mailing ListThird Party Advisory
- http://xenbits.xen.org/xsa/advisory-401.htmlPatchVendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- 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 AdvisoryVDB Entry
- http://www.openwall.com/lists/oss-security/2022/06/09/3Mailing ListThird Party Advisory
- http://xenbits.xen.org/xsa/advisory-401.htmlPatchVendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202208-23Third Party Advisory
- https://www.debian.org/security/2022/dsa-5184Third Party Advisory
FAQ
What is CVE-2022-26362?
CVE-2022-26362 is a vulnerability with a CVSS score of 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. This scheme is used to maintain invariants required for Xen's sa...
How severe is CVE-2022-26362?
CVE-2022-26362 has been rated MEDIUM with a CVSS base score of 6.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-26362?
Check the references section above for vendor advisories and patch information. Affected products include: Xen Xen, Fedoraproject Fedora, Debian Debian Linux.