Detections
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Alpine: xen: security update to 4.16.1-r1
medium Tenable Cloud Security Plugin ID 407829
Description
There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:- 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. (CVE-2022-26362)
- x86 pv: Insufficient care with non-coherent mappings T[his CNA information record relates to multiple
CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] 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, Xen's safety logic doesn't account for CPU-induced cache non-
coherency; cases where the CPU can cause the content of the cache to be different to the content in main
memory. In such cases, Xen's safety logic can incorrectly conclude that the contents of a page is safe.
(CVE-2022-26363, CVE-2022-26364)
See Also
https://security.alpinelinux.org/vuln/CVE-2022-26362
Plugin Details
Severity: Medium
ID: 407829
Version: Revision 1.27
Type: Local
Published: 10/31/2023
Updated: 7/2/2026
Supported Sensors: Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security
Risk Information
VPR
Risk Factor: Medium
Score: 6.9
Percentile: 97.35
CVSS v2
Risk Factor: High
Base Score: 7.2
Temporal Score: 5.6
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2022-26364
CVSS v3
Risk Factor: Medium
Base Score: 6.7
Temporal Score: 6
Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
Vulnerability Information
Exploit Available: true
Exploit Ease: Exploits are available
Vulnerability Publication Date: 6/9/2022