KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest mode
Summary
| CVE | CVE-2026-64604 |
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| State | PUBLISHED |
|---|
| Assigner | Linux |
|---|
| Source Priority | CVE Program / NVD first with legacy fallback |
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| Published | 2026-08-06 08:16:36 UTC |
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| Updated | 2026-08-06 08:16:36 UTC |
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| 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. |
|---|
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|
| CNA |
Linux |
Linux |
affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 c7cd3605244c924249dea32632e1bc3e89bda543 git |
Not specified |
| CNA |
Linux |
Linux |
affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 9a21f1defd96c6301c5fb462a78eb51b191bd2dd git |
Not specified |
| CNA |
Linux |
Linux |
affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 570af5db081b87374594a00711ac5760d2ea6844 git |
Not specified |
| CNA |
Linux |
Linux |
affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ffaaff82336db84e9b58e7a3e81c2fd64e05ed7a git |
Not specified |
| CNA |
Linux |
Linux |
affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 258ec63c0f281bf7b50f9de67c8e93b5b7be5ed4 git |
Not specified |
| CNA |
Linux |
Linux |
affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 3dcfb04dd43b16fa1240fc6487fff578ad57264c git |
Not specified |
| CNA |
Linux |
Linux |
affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 db8407b9fd06d857a4a5e8bcff1d086d13007711 git |
Not specified |
| CNA |
Linux |
Linux |
affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 7ef78d71ca713d8c00f7c34ddcf276c808143f77 git |
Not specified |
| CNA |
Linux |
Linux |
affected 5.10.261 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 5.15.212 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.1.178 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.6.145 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.12.96 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.18.39 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 7.1.4 semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 5.10.261 5.10.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 5.15.212 5.15.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.1.178 6.1.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.6.145 6.6.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.12.96 6.12.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.18.39 6.18.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.1.4 7.1.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.2-rc1 * original_commit_for_fix |
Not specified |
References
| Reference | Source | Link | Tags |
|---|
| git.kernel.org/stable/c/9a21f1defd96c6301c5fb462a78eb51b191bd2dd |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/570af5db081b87374594a00711ac5760d2ea6844 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/7ef78d71ca713d8c00f7c34ddcf276c808143f77 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/3dcfb04dd43b16fa1240fc6487fff578ad57264c |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/ffaaff82336db84e9b58e7a3e81c2fd64e05ed7a |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/c7cd3605244c924249dea32632e1bc3e89bda543 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/258ec63c0f281bf7b50f9de67c8e93b5b7be5ed4 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/db8407b9fd06d857a4a5e8bcff1d086d13007711 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.