Out-of-Bounds Affecting xen package, versions <4.11.3+24-g14b62ab3e5-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.05% (23rd percentile)

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  • Snyk IDSNYK-DEBIAN11-XEN-537549
  • published11 Dec 2019
  • disclosed11 Dec 2019

Introduced: 11 Dec 2019

CVE-2019-19581  (opens in a new tab)
CWE-119  (opens in a new tab)

How to fix?

Upgrade Debian:11 xen to version 4.11.3+24-g14b62ab3e5-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xen package and not the xen package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

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.

CVSS Scores

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