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CVE-2026-62432

evtchn: Race between FIFO expand and reset

Published: Jul 28, 2026Updated: Jul 28, 2026 Sources: CVE List NVDCWE-362
7.3HIGH
NVD MITRE
EPSS Score
0.2%
Top 88.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
OpenVAS

Description

The EVTCHNOP_expand_array hypercall checks for whether FIFO event channels are enabled, but without holding the correct lock. It can race with EVTCHNOP_reset, resulting in dereferencing a NULL pointer.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-362

Affected Products

Xen
oss-project·GBaka xapi, qemu
XenOn-prem
Cloud & SaaS / virtualization

Exploitability

Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

https://xenbits.xenproject.org/xsa/advisory-505.html
xenbits.xenproject.org
http://www.openwall.com/lists/oss-security/2026/07/28/21
openwall.com
http://xenbits.xen.org/xsa/advisory-505.html
xenbits.xen.org

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