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.
References (3)
Core 3
Core References
Various Sources
http://xenbits.xen.org/xsa/advisory-505.html
Scores
CVSS v3
7.3
EPSS
0.0021
EPSS Percentile
11.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-362
Status
published
Products (1)
Xen/Xen
consult Xen advisory XSA-505
Published
Jul 28, 2026
Tracked Since
Jul 28, 2026