发布于3月6日3月6日 Members Alma Linux: CVE-2024-39483: Moderate: kernel security update (ALSA-2024-8162) Severity 5 CVSS (AV:L/AC:L/Au:S/C:N/I:N/A:C) Published 07/05/2024 Created 10/29/2024 Added 10/28/2024 Modified 01/30/2025 Description In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: WARN on vNMI + NMI window iff NMIs are outright masked When requesting an NMI window, WARN on vNMI support being enabled if and only if NMIs are actually masked, i.e. if the vCPU is already handling an NMI.KVM's ABI for NMIs that arrive simultanesouly (from KVM's point of view) is to inject one NMI and pend the other.When using vNMI, KVM pends the second NMI simply by setting V_NMI_PENDING, and lets the CPU do the rest (hardware automatically sets V_NMI_BLOCKING when an NMI is injected). However, if KVM can't immediately inject an NMI, e.g. because the vCPU is in an STI shadow or is running with GIF=0, then KVM will request an NMI window and trigger the WARN (but still function correctly). Whether or not the GIF=0 case makes sense is debatable, as the intent of KVM's behavior is to provide functionality that is as close to real hardware as possible.E.g. if two NMIs are sent in quick succession, the probability of both NMIs arriving in an STI shadow is infinitesimally low on real hardware, but significantly larger in a virtual environment, e.g. if the vCPU is preempted in the STI shadow.For GIF=0, the argument isn't as clear cut, because the window where two NMIs can collide is much larger in bare metal (though still small). That said, KVM should not have divergent behavior for the GIF=0 case based on whether or not vNMI support is enabled.And KVM has allowed simultaneous NMIs with GIF=0 for over a decade, since commit 7460fb4a3400 ("KVM: Fix simultaneous NMIs").I.e. KVM's GIF=0 handling shouldn't be modified without a *really* good reason to do so, and if KVM's behavior were to be modified, it should be done irrespective of vNMI support. Solution(s) alma-upgrade-bpftool alma-upgrade-kernel alma-upgrade-kernel-64k alma-upgrade-kernel-64k-core alma-upgrade-kernel-64k-debug alma-upgrade-kernel-64k-debug-core alma-upgrade-kernel-64k-debug-devel alma-upgrade-kernel-64k-debug-devel-matched alma-upgrade-kernel-64k-debug-modules alma-upgrade-kernel-64k-debug-modules-core alma-upgrade-kernel-64k-debug-modules-extra alma-upgrade-kernel-64k-devel alma-upgrade-kernel-64k-devel-matched alma-upgrade-kernel-64k-modules alma-upgrade-kernel-64k-modules-core alma-upgrade-kernel-64k-modules-extra alma-upgrade-kernel-abi-stablelists alma-upgrade-kernel-core alma-upgrade-kernel-cross-headers alma-upgrade-kernel-debug alma-upgrade-kernel-debug-core alma-upgrade-kernel-debug-devel alma-upgrade-kernel-debug-devel-matched alma-upgrade-kernel-debug-modules alma-upgrade-kernel-debug-modules-core alma-upgrade-kernel-debug-modules-extra alma-upgrade-kernel-debug-uki-virt alma-upgrade-kernel-devel alma-upgrade-kernel-devel-matched alma-upgrade-kernel-doc alma-upgrade-kernel-headers alma-upgrade-kernel-modules alma-upgrade-kernel-modules-core alma-upgrade-kernel-modules-extra alma-upgrade-kernel-rt alma-upgrade-kernel-rt-core alma-upgrade-kernel-rt-debug alma-upgrade-kernel-rt-debug-core alma-upgrade-kernel-rt-debug-devel alma-upgrade-kernel-rt-debug-modules alma-upgrade-kernel-rt-debug-modules-core alma-upgrade-kernel-rt-debug-modules-extra alma-upgrade-kernel-rt-devel alma-upgrade-kernel-rt-modules alma-upgrade-kernel-rt-modules-core alma-upgrade-kernel-rt-modules-extra alma-upgrade-kernel-tools alma-upgrade-kernel-tools-libs alma-upgrade-kernel-tools-libs-devel alma-upgrade-kernel-uki-virt alma-upgrade-kernel-zfcpdump alma-upgrade-kernel-zfcpdump-core alma-upgrade-kernel-zfcpdump-devel alma-upgrade-kernel-zfcpdump-devel-matched alma-upgrade-kernel-zfcpdump-modules alma-upgrade-kernel-zfcpdump-modules-core alma-upgrade-kernel-zfcpdump-modules-extra alma-upgrade-libperf alma-upgrade-perf alma-upgrade-python3-perf alma-upgrade-rtla alma-upgrade-rv References https://attackerkb.com/topics/cve-2024-39483 CVE - 2024-39483 https://errata.almalinux.org/9/ALSA-2024-8162.html
