TI-2022-20534 Aliases CVE-2022-42318 GHSA-j33c-mrwq-fprw

Resource allocation without limits in xen

LOW 28CWE-770Published 2022-11-01 · Updated 2025-05-05

Key facts

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

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-770.

Summary

Xenstore: guests can let run xenstored out of memory T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Malicious guests can cause xenstored to allocate vast amounts of memory, eventually resulting in a Denial of Service (DoS) of xenstored. There are multiple ways how guests can cause large memory allocations in xenstored: - - by issuing new requests to xenstored without reading the responses, causing the responses to be buffered in memory - - by causing large number of watch events to be generated via setting up multiple xenstore watches and then e.g. deleting many xenstore nodes below the watched path - - by creating as many nodes as allowed with the maximum allowed size and path length in as many transactions as possible - - by accessing many nodes inside a transaction

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00264 18th 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: Partial

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 · 5

CPE	Versions	Role	Vendor
cpe:2.3:o:xen:xen:-:::::::*	not specified by NVD	Vulnerable	Xen
cpe:2.3:o:debian:debian_linux:11.0:::::::*	11.0	Vulnerable	Debian
cpe:2.3:o:fedoraproject:fedora:35:::::::*	35	Vulnerable	Fedoraproject
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:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Xen
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* Versions 35 Vulnerable ·Fedoraproject
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-2022-20543 Improper access control in xenPriority LOW 33
- TI-2022-20536 Xenstore: Guests can get access to Xenstore nodes of deleted domains Access rights of…Priority LOW 33
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-2022-20543 Improper access control in xenPriority LOW 33
- TI-2022-20536 Xenstore: Guests can get access to Xenstore nodes of deleted domains Access rights of…Priority LOW 33
Show all 19 records → Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2022-42318
2026-10-03 Alias added: GHSA-j33c-mrwq-fprw

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