CVE-2022-42327 — Improper Access Control in XEN

CWE-284 — Improper Access Control4 documents4 sources
Severity
7.1HIGHNVD
EPSS
0.0%
top 97.38%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
XENDebian XENFedoraproject Fedora
Timeline
PublishedNov 1

Description

x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NExploitability: 1.8 | Impact: 5.2

Affected Packages3 packages

▶debiandebian/xen< xen 4.16.2+90-g0d39a6d1ae-1 (bookworm)
▶Debianxen/xen< 4.16.2+90-g0d39a6d1ae-1+2
▶NVDxen/xen4.16

Also affects: Fedora 36, 37

Patches

Patch: www.openwall.com ↗Patch: xenbits.xen.org ↗Patch: www.openwall.com ↗

🔴Vulnerability Details

2
GHSA
GHSA-rgfj-62rr-5vf5: x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the glo↗2022-11-01
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OSV
CVE-2022-42327: x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the glo↗2022-11-01
▶

📋Vendor Advisories

1
Debian
CVE-2022-42327: xen - x86: unintended memory sharing between guests On Intel systems that support the ...↗2022
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