Orta CVSS 5.5

CVE-2025-40300: Linux Kernel: güvenlik açığı

Yayın: 11 Eylül 2025 20:15 · Güncelleme: 6 Kasım 2026 09:48

Açıklama (NVD)

In the Linux kernel, the following vulnerability has been resolved: x86/vmscape: Add conditional IBPB mitigation VMSCAPE is a vulnerability that exploits insufficient branch predictor isolation between a guest and a userspace hypervisor (like QEMU). Existing mitigations already protect kernel/KVM from a malicious guest. Userspace can additionally be protected by flushing the branch predictors after a VMexit. Since it is the userspace that consumes the poisoned branch predictors, conditionally issue an IBPB after a VMexit and before returning to userspace. Workloads that frequently switch between hypervisor and userspace will incur the most overhead from the new IBPB. This new IBPB is not integrated with the existing IBPB sites. For instance, a task can use the existing speculation control prctl() to get an IBPB at context switch time. With this implementation, the IBPB is doubled up: one at context switch and another before running userspace. The intent is to integrate and optimize these cases post-embargo. [ dhansen: elaborate on suboptimal IBPB solution ]

Özet bilgiler

Ürün: Linux Linux Kernel
CVSS v3.1: 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS: %0,38 (yüzdelik 32)
Yama: Mevcut

Etkilenen sürümler

Ürün	Başlangıç	Bitiş	Düzeltildi
linux-linux-kernel	3.16.57	—	3.17
linux-linux-kernel	4.4.168	—	4.5
linux-linux-kernel	4.16	—	5.10.244
linux-linux-kernel	5.11	—	5.15.193
linux-linux-kernel	5.16	—	6.1.152
linux-linux-kernel	6.2	—	6.6.106
linux-linux-kernel	6.7	—	6.12.47
linux-linux-kernel	6.13	—	6.16.7
linux-linux-kernel	6.17	6.17	—
linux-linux-kernel	6.17	6.17	—
linux-linux-kernel	6.17	6.17	—
linux-linux-kernel	6.17	6.17	—
linux-linux-kernel	6.17	6.17	—
debian-debian-linux	11.0	11.0	—

Kaynaklar

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