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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72284
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:21:59 UTC
Updated2026-08-17 06:18:31 UTC
DescriptionIn 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 ]---

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

EPSS: 0.001870000 probability, percentile 0.085950000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ae7a2a3fb6f8b784c2752863f4f1f20c656f76fb 038b9ce6fafda1babd1e33d52cbc6039747a6d87 git Not specified
CNA Linux Linux affected ae7a2a3fb6f8b784c2752863f4f1f20c656f76fb 8e9f7a95279bf608cf4c331ed89612e28c04564f git Not specified
CNA Linux Linux affected ae7a2a3fb6f8b784c2752863f4f1f20c656f76fb ebd7845ca0471d251a1cb48d84eb165aff5b7123 git Not specified
CNA Linux Linux affected ae7a2a3fb6f8b784c2752863f4f1f20c656f76fb 97542f15dc4cf6cd3fdc035e482dca54246ddf48 git Not specified
CNA Linux Linux affected ae7a2a3fb6f8b784c2752863f4f1f20c656f76fb 32bdca80aa81c2cb906f50a88b220ce1ecdc5e6e git Not specified
CNA Linux Linux affected ae7a2a3fb6f8b784c2752863f4f1f20c656f76fb 9285e4070df2c40585c3d7ec9571faa7a2b97e17 git Not specified
CNA Linux Linux affected 3.6 Not specified
CNA Linux Linux unaffected 3.6 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 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/97542f15dc4cf6cd3fdc035e482dca54246ddf48 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/038b9ce6fafda1babd1e33d52cbc6039747a6d87 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8e9f7a95279bf608cf4c331ed89612e28c04564f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9285e4070df2c40585c3d7ec9571faa7a2b97e17 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/32bdca80aa81c2cb906f50a88b220ce1ecdc5e6e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ebd7845ca0471d251a1cb48d84eb165aff5b7123 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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