CVE-2026-72284

Summary

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 —[ end trace 0000000000000000 ]—

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxae7a2a3fb6f8b784c2752863f4f1f20c656f76fb < 038b9ce6fafda1babd1e33d52cbc6039747a6d87affected
LinuxLinuxae7a2a3fb6f8b784c2752863f4f1f20c656f76fb < 8e9f7a95279bf608cf4c331ed89612e28c04564faffected
LinuxLinuxae7a2a3fb6f8b784c2752863f4f1f20c656f76fb < ebd7845ca0471d251a1cb48d84eb165aff5b7123affected
LinuxLinuxae7a2a3fb6f8b784c2752863f4f1f20c656f76fb < 97542f15dc4cf6cd3fdc035e482dca54246ddf48affected
LinuxLinuxae7a2a3fb6f8b784c2752863f4f1f20c656f76fb < 32bdca80aa81c2cb906f50a88b220ce1ecdc5e6eaffected
LinuxLinuxae7a2a3fb6f8b784c2752863f4f1f20c656f76fb < 9285e4070df2c40585c3d7ec9571faa7a2b97e17affected
LinuxLinux3.6affected
LinuxLinux0 < 3.6unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References