6.9

CVE-2022-26362

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Xen ≫ Xen HwPlatform x86
Fedoraproject ≫ Fedora Version 35
Fedoraproject ≫ Fedora Version 36
Debian ≫ Debian Linux Version 11.0
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.38% 0.295
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 6.4 0.5 5.9
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
NIST 6.9 3.4 10
AV:L/AC:M/Au:N/C:C/I:C/A:C
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

https://security.gentoo.org/glsa/202208-23
Third Party 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
Third Party Advisory
Mailing List
http://xenbits.xen.org/xsa/advisory-401.html
Patch
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://www.debian.org/security/2022/dsa-5184
Third Party Advisory
https://xenbits.xenproject.org/xsa/advisory-401.txt
Vendor Advisory