Xenstore: Guests can crash xenstored via exhausting the stack Xenstored is using recursion for some Xenstore operations (e.g.

published 2022-11-01 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-45396

cvss: 6.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits: 0; none known

Xenstore: Guests can crash xenstored via exhausting the stack Xenstored is using recursion for some Xenstore operations (e.g. for deleting a sub-tree of Xenstore nodes). With sufficiently deep nesting levels this can result in stack exhaustion on xenstored, leading to a crash of xenstored.

Patch / fix

distros 3 links 2

debian suse alpine

xen Debian 14, Debian 13, Debian 12 4.16.2+90-g0d39a6d1ae-1

debian advisories DEBIAN-CVE-2022-42321

xen SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 4.12.4_30-3.82.1
xen SLES for SAP 12 SP4, SLES 12 SP4-LTSS, OpenStack Cloud Crowbar 9 +1 more 4.11.4_34-2.83.1
xen SLES 12 SP2-BCL 4.7.6_28-43.98.1
xen SLE Module for Server Applications 15 SP4, SLE Module for Basesystem 15 SP4, SLE Micro 5.3 +1 more 4.16.2_08-150400.4.16.1
xen SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +6 more 4.13.4_16-150200.3.65.1
xen SLES 12 SP3-BCL 4.9.4_34-3.114.1
xen SLE Module for Server Applications 15 SP3, SLE Module for Basesystem 15 SP3, SLE Micro 5.2 +3 more 4.14.5_08-150300.3.40.1
xen SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +3 more 4.12.4_30-150100.3.80.1

suse advisories SUSE-SU-2022:4332-1 SUSE-SU-2022:4241-1 SUSE-SU-2022:4051-1 SUSE-SU-2022:4007-1 SUSE-SU-2022:3971-1 SUSE-SU-2022:3960-1

xen Alpine 3.15, Alpine 3.14 4.15.4-r0
xen Alpine 3.17, Alpine 3.16 4.16.3-r0
xen Alpine 3.24, Alpine 3.23, Alpine 3.22 +4 more 4.17.0-r0

alpine advisories ALPINE-CVE-2022-42321

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

xenbits.xenproject.org/xsa/advisory-418.txt advisory
xenbits.xen.org/xsa/advisory-418.html advisory

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.5	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Affected products

Xen xen

Classification

Weakness

CWE-674 Uncontrolled Recursion

References

xenbits.xenproject.org /xsa/advisory-418.txt
patch, vendor-advisory
xenbits.xen.org /xsa/advisory-418.html
patch, vendor-advisory
debian.org /security/2022/dsa-5272
vendor-advisory, third-party-advisory
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/ZLI2NPNEH7CNJO3VZGQNOI4M4EWLNKPZ/
vendor-advisory
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/YZVXG7OOOXCX6VIPEMLFDPIPUTFAYWPE/
vendor-advisory
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/YTMITQBGC23MSDHUCAPCVGLMVXIBXQTQ/
vendor-advisory
security.gentoo.org /glsa/202402-07
vendor-advisory
openwall.com /lists/oss-security/2022/11/01/8
mailing-list, third-party-advisory

Sources

CVE List CVE-2022-42321
NVD CVE-2022-42321

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary