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CVE-2020-25596

Description

An issue was discovered in Xen through 4.14.x. x86 PV guest kernels can experience denial of service via SYSENTER. The SYSENTER instruction leaves various state sanitization activities to software. One of Xens sanitization paths injects a #GP fault, and incorrectly delivers it twice to the guest. This causes the guest kernel to observe a kernel-privilege #GP fault (typically fatal) rather than a user-privilege #GP fault (usually converted into SIGSEGV/etc.). Malicious or buggy userspace can crash the guest kernel, resulting in a VM Denial of Service. All versions of Xen from 3.2 onwards are vulnerable. Only x86 systems are vulnerable. ARM platforms are not vulnerable. Only x86 systems that support the SYSENTER instruction in 64bit mode are vulnerable. This is believed to be Intel, Centaur, and Shanghai CPUs. AMD and Hygon CPUs are not believed to be vulnerable. Only x86 PV guests can exploit the vulnerability. x86 PVH / HVM guests cannot exploit the vulnerability.

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
0.086

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