CVE-2026-72284

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

State: Published
Severity: 7.1 High
Published: Aug 15, 2026
Updated: Oct 16, 2026
Reserved: Aug 9, 2026

Description

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 ]---

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	ae7a2a3fb6f8b784c2752863f4f1f20c656f76fb to before 038b9ce6fafda1babd1e33d52cbc6039747a6d87Affected ae7a2a3fb6f8b784c2752863f4f1f20c656f76fb to before 8e9f7a95279bf608cf4c331ed89612e28c04564fAffected ae7a2a3fb6f8b784c2752863f4f1f20c656f76fb to before ebd7845ca0471d251a1cb48d84eb165aff5b7123Affected ae7a2a3fb6f8b784c2752863f4f1f20c656f76fb to before 97542f15dc4cf6cd3fdc035e482dca54246ddf48Affected ae7a2a3fb6f8b784c2752863f4f1f20c656f76fb to before 32bdca80aa81c2cb906f50a88b220ce1ecdc5e6eAffected ae7a2a3fb6f8b784c2752863f4f1f20c656f76fb to before 9285e4070df2c40585c3d7ec9571faa7a2b97e17Affected
LinuxLinux	3.6Affected before 3.6Not affected 6.1.178 through 6.1.Not affected 6.6.145 through 6.6.Not affected 6.12.97 through 6.12.Not affected 6.18.40 through 6.18.Not affected 7.1.5 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

ae7a2a3fb6f8b784c2752863f4f1f20c656f76fb to before 038b9ce6fafda1babd1e33d52cbc6039747a6d87Affected
ae7a2a3fb6f8b784c2752863f4f1f20c656f76fb to before 8e9f7a95279bf608cf4c331ed89612e28c04564fAffected
ae7a2a3fb6f8b784c2752863f4f1f20c656f76fb to before ebd7845ca0471d251a1cb48d84eb165aff5b7123Affected
ae7a2a3fb6f8b784c2752863f4f1f20c656f76fb to before 97542f15dc4cf6cd3fdc035e482dca54246ddf48Affected
ae7a2a3fb6f8b784c2752863f4f1f20c656f76fb to before 32bdca80aa81c2cb906f50a88b220ce1ecdc5e6eAffected
ae7a2a3fb6f8b784c2752863f4f1f20c656f76fb to before 9285e4070df2c40585c3d7ec9571faa7a2b97e17Affected

LinuxLinux

3.6Affected
before 3.6Not affected
6.1.178 through 6.1.*Not affected
6.6.145 through 6.6.*Not affected
6.12.97 through 6.12.*Not affected
6.18.40 through 6.18.*Not affected
7.1.5 through 7.1.*Not affected
7.2 and laterNot affected

References

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