Vulnerability Details : 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.
Products affected by CVE-2022-26362
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
- cpe:2.3:o:xen:xen:*:*:*:*:*:*:x86:*
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2022-26362
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 12 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2022-26362
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.9
|
MEDIUM | AV:L/AC:M/Au:N/C:C/I:C/A:C |
3.4
|
10.0
|
NIST | |
|
6.4
|
MEDIUM | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H |
0.5
|
5.9
|
NIST |
CWE ids for CVE-2022-26362
-
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.Assigned by: nvd@nist.gov (Primary)
References for CVE-2022-26362
-
https://www.debian.org/security/2022/dsa-5184
Debian -- Security Information -- DSA-5184-1 xenThird Party Advisory
-
https://security.gentoo.org/glsa/202208-23
Xen: Multiple Vulnerabilities (GLSA 202208-23) — Gentoo securityThird Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OH65U6FTTB5MLH5A6Q3TW7KVCGOG4MYI/
[SECURITY] Fedora 36 Update: qemu-6.2.0-12.fc36 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
http://www.openwall.com/lists/oss-security/2022/06/09/3
oss-security - Xen Security Advisory 401 v2 (CVE-2022-26362) - x86 pv: Race condition in typeref acquisitionMailing List;Third Party Advisory
-
https://xenbits.xenproject.org/xsa/advisory-401.txt
Vendor Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RKRXZ4LHGCGMOG24ZCEJNY6R2BTS4S2Q/
[SECURITY] Fedora 35 Update: xen-4.15.3-2.fc35 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
http://packetstormsecurity.com/files/167718/Xen-TLB-Flush-Bypass.html
Xen TLB Flush Bypass ≈ Packet StormThird Party Advisory;VDB Entry
-
http://xenbits.xen.org/xsa/advisory-401.html
XSA-401 - Xen Security AdvisoriesPatch;Vendor Advisory
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