CVE-2026-62430
highpriority · track · 0EPSS 0.002 · 15 %ileDEEUEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (12)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- WID-SEC-W-2026-2568Xen: Mehrere SchwachstellenDeutsch2026-07-28csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Xen ausnutzen, um seine Privilegien zu erhöhen, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand auszulösen.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (7)
External citations — patches, advisories, analysis.
- http://xenbits.xen.org/xsa/advisory-503.htmlcnnvd
- https://xenbits.xenproject.org/xsa/advisory-503.htmlcnnvd
- https://xenproject.org/Patchcnnvd
- https://xenbits.xenproject.org/xsa/advisory-503.htmlenisa_euvd
- http://www.openwall.com/lists/oss-security/2026/07/28/19nvd
- http://xenbits.xen.org/xsa/advisory-503.htmlnvd
- https://xenbits.xenproject.org/xsa/advisory-503.htmlnvd
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