CVE-2026-74517

CRITICALPre-NVD 9.39.3—
EchelonGraph scoreHIGH confidence

Score 9.3 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-15. a secondary CVSS source baseline 9.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

KVM: x86: Cancel delayed I/O APIC EOI handling before destroying vCPUs

Cancel (and flush) the I/O APIC's delayed EOI handling work during the "pre VM destroy" phase, before vCPUs are destroyed, as processing the EOI broadcast will inject another IRQ if the line is asserted, i.e. will try to deliver an IRQ to the target vCPU(s). Canceling the work after vCPUs are destroyed leads to UAF if the delayed work is processed after vCPUs are destroyed.

BUG: KASAN: slab-use-after-free in __kvm_irq_delivery_to_apic_fast+0x9bf/0xa20 arch/x86/kvm/lapic.c:1250 Read of size 8 at addr ffff8880499abea0 by task kworker/1:2/1218

CPU: 1 UID: 0 PID: 1218 Comm: kworker/1:2 Not tainted 7.1.0-rc7 #5 PREEMPT(lazy) Hardware name: QEMU Ubuntu 25.10 PC v2 (i440FX + PIIX, + 10.1 machine, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: events kvm_ioapic_eoi_inject_work Call Trace: __dump_stack lib/dump_stack.c:94 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 print_report+0x139/0x4ad mm/kasan/report.c:482 kasan_report+0xe4/0x1d0 mm/kasan/report.c:595 __kvm_irq_delivery_to_apic_fast+0x9bf/0xa20 arch/x86/kvm/lapic.c:1250 __kvm_irq_delivery_to_apic+0xd8/0xbf0 arch/x86/kvm/lapic.c:1345 kvm_irq_delivery_to_apic arch/x86/kvm/lapic.h:129 ioapic_service+0x308/0x590 arch/x86/kvm/ioapic.c:492 kvm_ioapic_eoi_inject_work+0x13c/0x190 arch/x86/kvm/ioapic.c:532 process_one_work+0xa59/0x19a0 kernel/workqueue.c:3314 process_scheduled_works kernel/workqueue.c:3397 worker_thread+0x5eb/0xe50 kernel/workqueue.c:3478 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Note, the VM is unreachable once kvm_destroy_vm() starts, and scheduling new work via kvm_ioapic_send_eoi() can only be done via KVM_RUN, i.e. requires a live vCPU.

Alternatively, KVM could simply destroy the I/O APIC during the "pre" phase of VM destruction, but that gets more than a bit sketchy as KVM expects the I/O APIC to exist if ioapic_in_kernel() is true, and nested virtualization in particular has a bad habit of touching VM-scope state during vCPU destruction. E.g. attempting to free the PIC during the pre phase would lead to a NULL pointer dereference in kvm_cpu_has_extint(), and it's not hard to imagine the I/O APIC having a similar flaw.

CVSS v3
9.3
EG Score
9.3(high)
EG Risk
46(Track)
EG Risk 46/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity93% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

August 15, 2026

Last Modified

August 17, 2026

Advisory Details (2)

Auto-updated Aug 17, 2026
No patch confirmed yet.
generic

KVM: x86: Cancel delayed I/O APIC EOI handling before destroying vCPUs - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/ed56a6b58222f9c1f4115a0bd2788dd6ed6022e2
generic

KVM: x86: Cancel delayed I/O APIC EOI handling before destroying vCPUs - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9910e835580fef3bef53b70241dd00c4bffad693

Vendor Advisories for CVE-2026-74517(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Data Freshness Timeline

(refreshed 46× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-21 04:21 UTCGHSA enrichment
  2. 2026-08-21 00:16 UTCEG score recompute
  3. 2026-08-21 00:16 UTCGHSA enrichment
  4. 2026-08-20 22:56 UTCEPSS rescore
  5. 2026-08-20 20:13 UTCGHSA enrichment
  6. 2026-08-20 16:09 UTCGHSA enrichment
  7. 2026-08-20 12:04 UTCGHSA enrichment
  8. 2026-08-20 07:55 UTCGHSA enrichment
  9. 2026-08-20 03:52 UTCGHSA enrichment
  10. 2026-08-19 23:49 UTCGHSA enrichment
  11. 2026-08-19 19:45 UTCEG score recompute
  12. 2026-08-19 19:45 UTCGHSA enrichment
  13. 2026-08-19 17:04 UTCEPSS rescore
  14. 2026-08-19 15:41 UTCGHSA enrichment
  15. 2026-08-19 11:38 UTCGHSA enrichment
  16. 2026-08-19 07:34 UTCGHSA enrichment
  17. 2026-08-19 03:31 UTCGHSA enrichment
  18. 2026-08-18 23:27 UTCGHSA enrichment
  19. 2026-08-18 19:22 UTCGHSA enrichment
  20. 2026-08-18 15:18 UTCEG score recompute
  21. 2026-08-18 15:18 UTCGHSA enrichment
  22. 2026-08-18 13:49 UTCEPSS rescore
  23. 2026-08-18 13:49 UTCEPSS rescore
  24. 2026-08-18 11:14 UTCGHSA enrichment
  25. 2026-08-18 07:07 UTCGHSA enrichment
Show 21 more
  1. 2026-08-18 03:03 UTCGHSA enrichment
  2. 2026-08-17 22:58 UTCGHSA enrichment
  3. 2026-08-17 18:54 UTCGHSA enrichment
  4. 2026-08-17 14:31 UTCEG score recompute
  5. 2026-08-17 14:31 UTCGHSA enrichment
  6. 2026-08-17 13:47 UTCEPSS rescore
  7. 2026-08-17 10:27 UTCEG score recompute
  8. 2026-08-17 10:27 UTCGHSA enrichment
  9. 2026-08-17 06:24 UTCEG score recompute
  10. 2026-08-17 06:24 UTCGHSA enrichment
  11. 2026-08-17 05:55 UTCEG score recompute▲ 9.30
  12. 2026-08-17 05:55 UTCGHSA enrichment
  13. 2026-08-17 05:54 UTCMITRE cvelistV5CVSS v3 → 9.3 · severity → CRITICAL
  14. 2026-08-17 05:39 UTCEG score recompute
  15. 2026-08-17 05:39 UTCGHSA enrichment
  16. 2026-08-17 05:39 UTCMITRE cvelistV5
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-15 13:27 UTCNVD update
  20. 2026-08-15 12:39 UTCEG score recompute
  21. 2026-08-15 12:37 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-74517?
CVE-2026-74517 is a critical vulnerability published on August 15, 2026. In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Cancel delayed I/O APIC EOI handling before destroying vCPUs Cancel (and flush) the I/O APIC's delayed EOI handling work during the "pre VM destroy" phase, before vCPUs are destroyed, as processing the EOI broadcast will…
When was CVE-2026-74517 disclosed?
CVE-2026-74517 was first published in the National Vulnerability Database on August 15, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-74517 actively exploited?
CVE-2026-74517 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 96.8% of all scored CVEs.
What is the CVSS score of CVE-2026-74517?
CVE-2026-74517 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2026-74517?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-74517, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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