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kernel: KVM: nVMX: missing IBPB when exiting from nested guest can lead to Spectre v2 attacks

🗓️ 21 Feb 2024 00:33:59Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 3 Views

Flaw in kernel virtualization nested feature: missing indirect branch barrier at exit enables Spectre variant two.

Related
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Refs
ReporterTitlePublishedViews
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IBM Security Bulletins		Security Bulletin: Vulnerabilities in Linux kernel, libssh, and Java can affect IBM Spectrum Protect Plus
22 Aug 202314:18
–ibm
Tenable Nessus		Amazon Linux 2023 : bpftool, kernel, kernel-devel (ALAS2023-2023-127)
21 Mar 202300:00
–nessus
Tenable Nessus		Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.10-2023-028 (ALASKERNEL-5.10-2023-028)
22 Mar 202300:00
–nessus
Tenable Nessus		Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.15-2023-015 (ALASKERNEL-5.15-2023-015)
22 Mar 202300:00
–nessus
Tenable Nessus		Amazon Linux 2 : kernel, --advisory ALAS2KERNEL-5.4-2023-043 (ALASKERNEL-5.4-2023-043)
22 Mar 202300:00
–nessus
Tenable Nessus		Alibaba Cloud Linux 3 : 0042: cloud-kernel bugfix, enhancement and (ALINUX3-SA-2023:0042)
14 May 202500:00
–nessus
Tenable Nessus		AlmaLinux 9 : kernel-rt (ALSA-2023:2148)
14 May 202300:00
–nessus
Tenable Nessus		AlmaLinux 9 : kernel (ALSA-2023:2458)
14 May 202300:00
–nessus
Tenable Nessus		AlmaLinux 8 : kernel-rt (ALSA-2023:2736)
20 May 202300:00
–nessus
Tenable Nessus		AlmaLinux 8 : kernel (ALSA-2023:2951)
20 May 202300:00
–nessus
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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux8.6aarch64bpftool0:4.18.0-372.93.1.el8_6bpftool-0:4.18.0-372.93.1.el8_6.aarch64.rpm
Red Hat Enterprise Linux8.6ppc64lebpftool0:4.18.0-372.93.1.el8_6bpftool-0:4.18.0-372.93.1.el8_6.ppc64le.rpm
Red Hat Enterprise Linux8.6s390xbpftool0:4.18.0-372.93.1.el8_6bpftool-0:4.18.0-372.93.1.el8_6.s390x.rpm
Red Hat Enterprise Linux8.6x86_64bpftool0:4.18.0-372.93.1.el8_6bpftool-0:4.18.0-372.93.1.el8_6.x86_64.rpm
Red Hat Enterprise Linux8.6aarch64bpftool-debuginfo0:4.18.0-372.93.1.el8_6bpftool-debuginfo-0:4.18.0-372.93.1.el8_6.aarch64.rpm
Red Hat Enterprise Linux8.6ppc64lebpftool-debuginfo0:4.18.0-372.93.1.el8_6bpftool-debuginfo-0:4.18.0-372.93.1.el8_6.ppc64le.rpm
Red Hat Enterprise Linux8.6s390xbpftool-debuginfo0:4.18.0-372.93.1.el8_6bpftool-debuginfo-0:4.18.0-372.93.1.el8_6.s390x.rpm
Red Hat Enterprise Linux8.6x86_64bpftool-debuginfo0:4.18.0-372.93.1.el8_6bpftool-debuginfo-0:4.18.0-372.93.1.el8_6.x86_64.rpm
Red Hat Enterprise Linux8.6aarch64kernel0:4.18.0-372.93.1.el8_6kernel-0:4.18.0-372.93.1.el8_6.aarch64.rpm
Red Hat Enterprise Linux8.6ppc64lekernel0:4.18.0-372.93.1.el8_6kernel-0:4.18.0-372.93.1.el8_6.ppc64le.rpm
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03 Jul 2026 02:31Current
6.6Medium risk
Vulners AI Score6.6
CVSS 3.15.8 - 8.8
EPSS0.00285
SSVC
CWE-1188
nested virtualizationindirect branch barriervirtualization exit timingspectre variant twoguest isolation levels
3