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CVE-2026-64604— KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest mode

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 3.18版本存在安全漏洞，该漏洞源于更新CR8拦截时未限制仅在vCPU处于guest模式时获取vmcs12，可能触发lockdep断言，导致内核警告。

AI Predicted 7.5 Difficulty: Hard EPSS 0.17% · P5

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux a7c0b07d570848e50fce4d31ac01313484d6b844< c7cd3605244c924249dea32632e1bc3e89bda543 affected
a7c0b07d570848e50fce4d31ac01313484d6b844< 9a21f1defd96c6301c5fb462a78eb51b191bd2dd affected
a7c0b07d570848e50fce4d31ac01313484d6b844< 570af5db081b87374594a00711ac5760d2ea6844 affected
a7c0b07d570848e50fce4d31ac01313484d6b844< ffaaff82336db84e9b58e7a3e81c2fd64e05ed7a affected
a7c0b07d570848e50fce4d31ac01313484d6b844< 258ec63c0f281bf7b50f9de67c8e93b5b7be5ed4 affected
a7c0b07d570848e50fce4d31ac01313484d6b844< 3dcfb04dd43b16fa1240fc6487fff578ad57264c affected
a7c0b07d570848e50fce4d31ac01313484d6b844< db8407b9fd06d857a4a5e8bcff1d086d13007711 affected
a7c0b07d570848e50fce4d31ac01313484d6b844< 7ef78d71ca713d8c00f7c34ddcf276c808143f77 affected
… +10 more rows
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I. Basic Information for CVE-2026-64604

Vulnerability Information
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Vulnerability Title
KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest mode
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest mode When updating CR8 intercepts, get vmcs12 if and only if the vCPU is in guest mode so that a future change can have update CR8 intercepts during vCPU creation, without running afoul of get_vmcs12()'s lockdep assertion. ------------[ cut here ]------------ debug_locks && !(lock_is_held(&(&vcpu->mutex)->dep_map) || !refcount_read(&vcpu->kvm->users_count)) WARNING: arch/x86/kvm/vmx/nested.h:61 at get_vmcs12 arch/x86/kvm/vmx/nested.h:60 [inline], CPU#0: syz.2.19/5879 WARNING: arch/x86/kvm/vmx/nested.h:61 at vmx_update_cr8_intercept+0x3de/0x4e0 arch/x86/kvm/vmx/vmx.c:6879, CPU#0: syz.2.19/5879 Modules linked in: CPU: 0 UID: 0 PID: 5879 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:get_vmcs12 arch/x86/kvm/vmx/nested.h:60 [inline] RIP: 0010:vmx_update_cr8_intercept+0x3de/0x4e0 arch/x86/kvm/vmx/vmx.c:6879 Call Trace: <TASK> apic_update_ppr arch/x86/kvm/lapic.c:984 [inline] kvm_lapic_reset+0x1c24/0x2980 arch/x86/kvm/lapic.c:3023 kvm_vcpu_reset+0x44c/0x1bf0 arch/x86/kvm/x86.c:12986 kvm_arch_vcpu_create+0x746/0x8b0 arch/x86/kvm/x86.c:12847 kvm_vm_ioctl_create_vcpu+0x428/0x930 virt/kvm/kvm_main.c:4201 kvm_vm_ioctl+0x893/0xd50 virt/kvm/kvm_main.c:5159 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f </TASK> No functional change intended.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 3.18版本存在安全漏洞，该漏洞源于更新CR8拦截时未限制仅在vCPU处于guest模式时获取vmcs12，可能触发lockdep断言，导致内核警告。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux a7c0b07d570848e50fce4d31ac01313484d6b844 ~ c7cd3605244c924249dea32632e1bc3e89bda543 -
Linux Linux 3.18 -

II. Public POCs for CVE-2026-64604

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III. Intelligence Information for CVE-2026-64604

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Patches & Fixes for CVE-2026-64604 (7)

Same Patch Batch · Linux · 2026-08-06 · 22 CVEs total

CVE-2026-64597 9.8 CRITICAL smb: client: fix double-free in SMB2_close() replay
CVE-2026-64598 8.8 HIGH smb/client: Fix error code in smb2_aead_req_alloc()
CVE-2026-64586 8.8 HIGH wifi: brcmfmac: drain bus_reset work on device removal
CVE-2026-64583 7.8 HIGH usb: gadget: udc: bdc: free IRQ and drain func_wake_notify before teardown
CVE-2026-64584 7.8 HIGH usb: gadget: f_midi: cancel pending IN work before freeing the midi object
CVE-2026-64601 7.8 HIGH ALSA: us144mkii: capture_urb_complete: redundant usb_anchor_urb corrupts anchor list on ea
CVE-2026-64599 7.8 HIGH crypto: amlogic - avoid double cleanup in meson_crypto_probe()
CVE-2026-64585 7.8 HIGH can: esd_usb: kill anchored URBs before freeing netdevs
CVE-2026-64588 7.8 HIGH fuse-uring: fix data races on ring->ready
CVE-2026-64587 7.0 HIGH net: ethernet: arc: emac: quiesce interrupts before requesting IRQ
CVE-2026-64593 btrfs: do not trim a device which is not writeable
CVE-2026-64589 i2c: core: fix NULL-deref on adapter registration failure
CVE-2026-64591 iommu/vt-d: Avoid WARNING in sva unbind path
CVE-2026-64590 dma-buf/udmabuf: skip redundant cpu sync to fix cacheline EEXIST warning
CVE-2026-64592 riscv: mm: Unconditionally sfence.vma for spurious fault
CVE-2026-68480 x86/bugs: Make Safe-RET robust against interrupt injection
CVE-2026-64594 usb: gadget: f_fs: initialize reset_work at allocation time
CVE-2026-64595 HID: hid-lenovo-go: cancel cfg_setup work in hid_go_cfg_remove()
CVE-2026-64596 libfs: set SB_I_NOEXEC and SB_I_NODEV by default in init_pseudo()
CVE-2026-64603 platform/x86: intel-hid: Protect ACPI notify handler against recursion

Showing top 20 of 22 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64604

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