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CVE-2026-62430

HIGH
7.5
CVSS 3.1
Description
Accesses to the CMOS memory contents are done using an indirect IO port pair. Therefore Xen needs to cache the guest chosen index, and one of the usages of the index didn't take the necessary locking to avoid concurrent changes. As a result, a guest could change the index after it being checked, causing a subsequent out-of-bound read access to the contents of an array.

Metadata

CVE ID
CVE-2026-62430
State
PUBLISHED
Assigner
XEN
Reserved
2026-07-14 10:28 UTC
Published
2026-07-28 12:32 UTC
Last updated
2026-07-28 16:33 UTC
Primary CWE
CWE-362
CWE-362 Concurrent Execution using Shared Resource with Impr…
Vendor / Product
Xen / Xen
Sources
cve.org  ·  NVD

Severity & Metrics

7.5 HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC — CISA Coordinator
Exploitation
none
Automatable
yes
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
Xen Xen — consult Xen advisory XSA-503
Weakness (CWE)
CWESourceDescription
CWE-362 adp CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSS scores (1)
ScoreSeverityVersionSourceVector
7.5 HIGH 3.1 adp CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References (1)
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