[NEW] [high] Xen: Multiple vulnerabilities
An attacker can exploit multiple vulnerabilities in Xen to escalate privileges, disclose confidential information, or trigger a Denial-of-Service condition.
CSIRTS triage
- What
- Multiple vulnerabilities in Xen can be exploited to escalate privileges, disclose information, or trigger Denial of Service conditions.
- Who is affected
- Deployments of Xen are affected.
- Urgency
- Remediation is high urgency due to the potential for exploitation and severity of the vulnerabilities.
- Action
- Apply the latest patches for Xen.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2568
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-424920.46% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-424930.45% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-424940.11% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-424950.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-624230.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-624240.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-624250.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-624260.22% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 12% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-624270.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 15% of all EPSS-scored CVEs.
- Low exploitation riskCVE-2026-624280.11% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.
Referenced CVEs
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownDSA-6424-1 xen - security updatedebian
- unknownXen Multiple Vulnerabilitieshkcert
- unknownCitrix XenServer Multiple Vulnerabilitieshkcert
- unknownMultiple Vulnerabilities in Xen (July 29, 2026)cert-fr-avis
- unknownMultiple Vulnerabilities in Citrix XenServer (July 29, 2026)cert-fr-avis
- mediumCVE-2026-62436: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnera…nvd
- mediumCVE-2026-62435: [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnera…nvd
- mediumCVE-2026-62434: A guest started with Populated on Demand enabled (PoD) can attempt to reclaim pages which aren…nvd
- highCVE-2026-62433: Parts of the DM_OP handling code assumes the caller has provided the required number of buffer…nvd
- highCVE-2026-62432: The EVTCHNOP_expand_array hypercall checks for whether FIFO event channels are enabled, but wi…nvd
- highCVE-2026-62431: The logic to handle periodic Viridian STIMERs performs a division with an unchecked user-contr…nvd
- highCVE-2026-62430: Accesses to the CMOS memory contents are done using an indirect IO port pair. Therefore Xen ne…nvd
Recent advisories for Xen
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- high[NEU] [hoch] Xen: Mehrere Schwachstellencert-bund · 2026-09-09
- unknownMultiples vulnérabilités dans Xen (09 septembre 2026)cert-fr-avis · 2026-09-09
- mediumCVE-2026-79603: x86 PV guests can free memory pages while still keeping a stale TLB entry pointing to them. A …nvd · 2026-09-08
- highCVE-2026-79602: A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a …nvd · 2026-09-08
- high[UPDATE] [hoch] Xen und Citrix Systems XenServer: Mehrere Schwachstellencert-bund · 2026-09-04
- unknownCVE-2026-72086: In the Linux kernel, the following vulnerability has been resolved: scsi: xen: scsiback: Free …nvd · 2026-08-15
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