CVE-2026-62432

EUVD-2026-49785
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.
Race Condition
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.3 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 15.65%
Debian logo
Debian Releases
Debian Product
Codename
xen
bookworm
vulnerable
bookworm (security)
vulnerable
forky
4.20.3+127-gc42374a105-1
fixed
sid
4.20.3+127-gc42374a105-1
fixed
trixie
vulnerable
trixie (security)
4.20.3+127-gc42374a105-0+deb13u1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
xen
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
resolute
needs-triage
xenial
needs-triage
Common Weakness Enumeration
References
https://xenbits.xenproject.org/xsa/advisory-505.html
http://www.openwall.com/lists/oss-security/2026/07/28/21
http://xenbits.xen.org/xsa/advisory-505.html