CVE-2019-19581: n/a vulnerability

CVE-2019-19581: An issue was discovered in Xen through 4.12.x allowing 32-bit Arm guest OS users to cause a denial of servi...

An issue was discovered in Xen through 4.12.x allowing 32-bit Arm guest OS users to cause a denial of service (out-of-bounds access) because certain bit iteration is mishandled. In a number of places bitmaps are being used by the hypervisor to track certain state. Iteration over all bits involves functions which may misbehave in certain corner cases: On 32-bit Arm accesses to bitmaps with bit a count which is a multiple of 32, an out of bounds access may occur. A malicious guest may cause a hypervisor crash or hang, resulting in a Denial of Service (DoS). All versions of Xen are vulnerable. 32-bit Arm systems are vulnerable. 64-bit Arm systems are not vulnerable.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 5, 2024, 02:16 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2019-19581 is a Xen hypervisor availability flaw affecting 32-bit Arm systems. A malicious guest OS user could trigger an out-of-bounds bitmap access and crash or hang the hypervisor, disrupting all workloads on that host. 64-bit Arm systems are stated as not vulnerable. Exposure is limited to Xen deployments running on 32-bit Arm hardware, especially hosts running untrusted or multi-tenant guest workloads. 64-bit Arm deployments are not affected according to the advisory. Treat as urgent for any 32-bit Arm Xen environment because one guest could interrupt the whole host. For non-Arm or 64-bit Arm Xen fleets, document non-exposure and continue normal patch tracking. Mitigation focus: Apply Xen or distribution security updates that address XSA-307.; Prioritize shared or untrusted guest environments first.; Confirm hosts are not 32-bit Arm before deprioritizing..

Prepared: Jun 6, 2026, 03:53 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Dec 11, 2019, 16:50 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

7Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://xenbits.xen.org/xsa/advisory-307.htmlCVE reference · x_refsource_MISC
FEDORA-2019-6aad703290CVE reference · vendor-advisory, x_refsource_FEDORA
FEDORA-2019-2e12bd3a9aCVE reference · vendor-advisory, x_refsource_FEDORA
DSA-4602CVE reference · vendor-advisory, x_refsource_DEBIAN
20200114 [SECURITY] [DSA 4602-1] xen security updateCVE reference · mailing-list, x_refsource_BUGTRAQ
GLSA-202003-56CVE reference · vendor-advisory, x_refsource_GENTOO

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

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