Orta CVSS 5.5

CVE-2026-23401: Linux Kernel: serbest bırakılmış belleğin kullanımı

Yayın: 1 Nisan 2026 12:16 · Güncelleme: 6 Kasım 2026 10:16

Açıklama (NVD)

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/mmu: Drop/zap existing present SPTE even when creating an MMIO SPTE When installing an emulated MMIO SPTE, do so *after* dropping/zapping the existing SPTE (if it's shadow-present). While commit a54aa15c6bda3 was right about it being impossible to convert a shadow-present SPTE to an MMIO SPTE due to a _guest_ write, it failed to account for writes to guest memory that are outside the scope of KVM. E.g. if host userspace modifies a shadowed gPTE to switch from a memslot to emulted MMIO and then the guest hits a relevant page fault, KVM will install the MMIO SPTE without first zapping the shadow-present SPTE. ------------[ cut here ]------------ is_shadow_present_pte(*sptep) WARNING: arch/x86/kvm/mmu/mmu.c:484 at mark_mmio_spte+0xb2/0xc0 [kvm], CPU#0: vmx_ept_stale_r/4292 Modules linked in: kvm_intel kvm irqbypass CPU: 0 UID: 1000 PID: 4292 Comm: vmx_ept_stale_r Not tainted 7.0.0-rc2-eafebd2d2ab0-sink-vm #319 PREEMPT Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:mark_mmio_spte+0xb2/0xc0 [kvm] Call Trace: <TASK> mmu_set_spte+0x237/0x440 [kvm] ept_page_fault+0x535/0x7f0 [kvm] kvm_mmu_do_page_fault+0xee/0x1f0 [kvm] kvm_mmu_page_fault+0x8d/0x620 [kvm] vmx_handle_exit+0x18c/0x5a0 [kvm_intel] kvm_arch_vcpu_ioctl_run+0xc55/0x1c20 [kvm] kvm_vcpu_ioctl+0x2d5/0x980 [kvm] __x64_sys_ioctl+0x8a/0xd0 do_syscall_64+0xb5/0x730 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x47fa3f </TASK> ---[ end trace 0000000000000000 ]---

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: %0,19 (yüzdelik 9)
CWE: CWE-416
Yama: Mevcut

Etkilenen sürümler

Ürün	Başlangıç	Bitiş	Düzeltildi
linux-linux-kernel	5.13.1	—	5.15.203
linux-linux-kernel	5.16	—	6.1.168
linux-linux-kernel	6.2	—	6.6.131
linux-linux-kernel	6.7	—	6.12.80
linux-linux-kernel	6.13	—	6.18.21
linux-linux-kernel	6.19	—	6.19.11
linux-linux-kernel	5.13	5.13	—
linux-linux-kernel	7.0	7.0	—
linux-linux-kernel	7.0	7.0	—
linux-linux-kernel	7.0	7.0	—
linux-linux-kernel	7.0	7.0	—
linux-linux-kernel	7.0	7.0	—
linux-linux-kernel	7.0	7.0	—
linux-linux-kernel	7.0	7.0	—

Kaynaklar

Uygulamada aç Tüm CVE kayıtları