TI-2022-20543 Aliases CVE-2022-42327 GHSA-rgfj-62rr-5vf5

Improper access control in xen

LOW 33CWE-284Published 2022-11-01 · Updated 2025-05-05

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-284.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00245 15th percentileScored 2026-11-08

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Xen	xen	—	—	No fix listed	CNA

xen VendorXen Affected — Fixed in — No fix listed CNA

CPE configurations NVD · 3

CPE	Versions	Role	Vendor
cpe:2.3:o:xen:xen:4.16::::::x86:	4.16	Vulnerable	Xen
cpe:2.3:o:fedoraproject:fedora:36:::::::*	36	Vulnerable	Fedoraproject
cpe:2.3:o:fedoraproject:fedora:37:::::::*	37	Vulnerable	Fedoraproject

cpe:2.3:o:xen:xen:4.16:*:*:*:*:*:x86:* Versions 4.16 Vulnerable ·Xen
cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* Versions 36 Vulnerable ·Fedoraproject
cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* Versions 37 Vulnerable ·Fedoraproject

Remediation

No fixed version listed by the sources yet.

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Advisory · 2022-11-01
xen — FEDORA-2022-9f51d13fa3
19 records Highest priority Priority LOW 19 LOW
Other records, highest priority first
- TI-2022-20525 Xenstore: Guests can crash xenstored Due to a bug in the fix of XSA-115 a malicious guest…Priority LOW 38
- TI-2022-20536 Xenstore: Guests can get access to Xenstore nodes of deleted domains Access rights of…Priority LOW 33
- TI-2022-20537 Uncontrolled recursion in xenPriority LOW 29
Show all 19 records → Advisory →
Advisory · 2022-11-01
xen — FEDORA-2022-07438e12df
19 records Highest priority Priority LOW 19 LOW
Other records, highest priority first
- TI-2022-20525 Xenstore: Guests can crash xenstored Due to a bug in the fix of XSA-115 a malicious guest…Priority LOW 38
- TI-2022-20536 Xenstore: Guests can get access to Xenstore nodes of deleted domains Access rights of…Priority LOW 33
- TI-2022-20537 Uncontrolled recursion in xenPriority LOW 29
Show all 19 records → Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2022-42327
2026-10-03 Alias added: GHSA-rgfj-62rr-5vf5

References

Patch 2

Advisory 4

TI-2012-00210 The x86-64 kernel system-call functionality in Xen 4.1.2 and earlier, as used in Citrix… CVSS 2.0HIGH 7.2
TI-2023-07042 Information disclosure through error messages in AMD Ryzen™ 3000 Series Desktop… CVSS 3.1MEDIUM 5.5
TI-2015-04333 The C+ mode offload emulation in the RTL8139 network card device model in QEMU, as used… CVSS 2.0HIGH 9.3
TI-2015-06741 The KVM subsystem in the Linux kernel through 4.2.6, and Xen 4.3.x through 4.6.x, allows… CVSS 3.1CRITICAL 10.0
TI-2018-06436 A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures… CVSS 3.0HIGH 7.8
TI-2024-20522 x86: Incorrect logic for BTC/SRSO mitigations CVSS 3.1HIGH 7.5

See all 489 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences