CVE-2026-72284

In the Linux kernel, the following vulnerability has been resolved:

KVM: x86: Ignore pending PV EOI if the vCPU has since disabled PV EOIs

Ignore KVM's internal "service pending PV EOI" request if the vCPU has

disabled PV EOIs since the request was made. Asserting that PV EOIs are

enabled can fail if reading guest memory in pv_eoi_get_user() fails, i.e.

if pv_eoi_test_and_clr_pending() bails early, *and* the vCPU also disables

PV EOIs.

kernel BUG at arch/x86/kvm/lapic.c:3338!

Oops: invalid opcode: 0000 [#1] SMP

CPU: 4 UID: 1000 PID: 890 Comm: pv_eoi_test Not tainted 7.0.0-d585aa5894d8-vm #337 PREEMPT

Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015

RIP: 0010:kvm_lapic_sync_from_vapic+0x12b/0x140 [kvm]

Call Trace:

<TASK>

kvm_arch_vcpu_ioctl_run+0x1075/0x1c30 [kvm]

kvm_vcpu_ioctl+0x2d5/0x980 [kvm]

__x64_sys_ioctl+0x8a/0xd0

do_syscall_64+0xb5/0xb40

entry_SYSCALL_64_after_hwframe+0x4b/0x53

</TASK>

Modules linked in: kvm_intel kvm irqbypass

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