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CVE-2020-25601

Description

An issue was discovered in Xen through 4.14.x. There is a lack of preemption in evtchn_reset() / evtchn_destroy(). In particular, the FIFO event channel model allows guests to have a large number of event channels active at a time. Closing all of these (when resetting all event channels or when cleaning up after the guest) may take extended periods of time. So far, there was no arrangement for preemption at suitable intervals, allowing a CPU to spend an almost unbounded amount of time in the processing of these operations. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system. All Xen versions are vulnerable in principle. Whether versions 4.3 and older are vulnerable depends on underlying hardware characteristics.

Risk Information

Base Score
5.5
MODERATE
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS Score
Exploitation Probability
0.076

Associated Vulnerability

VulnerabilityOS Platform
SUSE-SU-2020:2788-1(SUSE Linux Enterprise Server 12-SP5 ) xen-4.12.3_08-3.24.1.x86_64.rpmLinux
SUSE-SU-2020:2788-1(SUSE Linux Enterprise Server 12-SP5 ) xen-debugsource-4.12.3_08-3.24.1.x86_64.rpmLinux
SUSE-SU-2020:2788-1(SUSE Linux Enterprise Server 12-SP5 ) xen-doc-html-4.12.3_08-3.24.1.x86_64.rpmLinux
SUSE-SU-2020:2788-1(SUSE Linux Enterprise Server 12-SP5 ) xen-libs-4.12.3_08-3.24.1.x86_64.rpmLinux
SUSE-SU-2020:2788-1(SUSE Linux Enterprise Server 12-SP5 ) xen-libs-32bit-4.12.3_08-3.24.1.x86_64.rpmLinux
SUSE-SU-2020:2788-1(SUSE Linux Enterprise Server 12-SP5 ) xen-libs-debuginfo-4.12.3_08-3.24.1.x86_64.rpmLinux
SUSE-SU-2020:2788-1(SUSE Linux Enterprise Server 12-SP5 ) xen-libs-debuginfo-32bit-4.12.3_08-3.24.1.x86_64.rpmLinux
SUSE-SU-2020:2788-1(SUSE Linux Enterprise Server 12-SP5 ) xen-tools-4.12.3_08-3.24.1.x86_64.rpmLinux
SUSE-SU-2020:2788-1(SUSE Linux Enterprise Server 12-SP5 ) xen-tools-debuginfo-4.12.3_08-3.24.1.x86_64.rpmLinux
SUSE-SU-2020:2788-1(SUSE Linux Enterprise Server 12-SP5 ) xen-tools-domU-4.12.3_08-3.24.1.x86_64.rpmLinux
SUSE-SU-2020:2788-1(SUSE Linux Enterprise Server 12-SP5 ) xen-tools-domU-debuginfo-4.12.3_08-3.24.1.x86_64.rpmLinux
Public headers and libs for Xen (USN-5617-1) libxenevtchn1_4.11.3+24-g14b62ab3e5-1ubuntu2.3_amd64.debLinux
Public headers and libs for Xen (USN-5617-1) libxengnttab1_4.11.3+24-g14b62ab3e5-1ubuntu2.3_amd64.debLinux
Public headers and libs for Xen (USN-5617-1) libxenmisc4.11_4.11.3+24-g14b62ab3e5-1ubuntu2.3_amd64.debLinux
Public headers and libs for Xen (USN-5617-1) xen-utils-4.11_4.11.3+24-g14b62ab3e5-1ubuntu2.3_amd64.debLinux
Public headers and libs for Xen (USN-5617-1) xenstore-utils_4.11.3+24-g14b62ab3e5-1ubuntu2.3_amd64.debLinux
Public headers and libs for Xen (USN-5617-1) xen-utils-common_4.11.3+24-g14b62ab3e5-1ubuntu2.3_amd64.debLinux
Public headers and libs for Xen (USN-5617-1) libxendevicemodel1_4.11.3+24-g14b62ab3e5-1ubuntu2.3_amd64.debLinux
Public headers and libs for Xen (USN-5617-1) xen-hypervisor-4.11-amd64_4.11.3+24-g14b62ab3e5-1ubuntu2.3_amd64.debLinux

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234