CVE-2026-74517
Estado: RecibidaCrítica (9.3)—
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.
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.
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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.
Detalles técnicos trazas, registros y código del informe original
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: <TASK> __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 </TASK>
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Puntuación base: 9.3
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.19%
- Percentil entre todas las CVEs puntuadas: 8
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation85 % - Impacto principal
T1499.004Application or System Exploitationimpact75 % - Impacto secundario
T1529System Shutdown/Rebootimpact70 %
Vulnerabilidad local (AV:L/PR:N/UI:N) en kernel KVM permite DoS por use-after-free al destruir vCPUs; acceso local sin privilegios requeridos.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.
Referencias
JSON original (NVD)
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{
"id": "CVE-2026-74517",
"cveTags": [],
"metrics": {
"cvssMetricV31": [
{
"type": "Secondary",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"cvssData": {
"scope": "CHANGED",
"version": "3.1",
"baseScore": 9.3,
"attackVector": "LOCAL",
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"integrityImpact": "HIGH",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "HIGH",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
},
"impactScore": 6,
"exploitabilityScore": 2.5
}
]
},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "c60f5156e62d0be6c53373b623f16a9e37e2208e",
"lessThan": "69d040448067cebdd5598684db36ce7d8fb2f43e",
"versionType": "git"
},
{
"status": "affected",
"version": "17bcd714426386fda741a4bccd96a2870179344b",
"lessThan": "5f0a99ea721203a4063618aafcca32abf573cb96",
"versionType": "git"
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{
"status": "affected",
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"lessThan": "ed56a6b58222f9c1f4115a0bd2788dd6ed6022e2",
"versionType": "git"
},
{
"status": "affected",
"version": "17bcd714426386fda741a4bccd96a2870179344b",
"lessThan": "9910e835580fef3bef53b70241dd00c4bffad693",
"versionType": "git"
},
{
"status": "affected",
"version": "6.12.41",
"lessThan": "6.12.105",
"versionType": "semver"
}
],
"programFiles": [
"arch/x86/kvm/x86.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.14"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.14",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.105",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.46",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/x86/kvm/x86.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-08-15T13:17:56.850",
"references": [
{
"url": "https://git.kernel.org/stable/c/5f0a99ea721203a4063618aafcca32abf573cb96",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/69d040448067cebdd5598684db36ce7d8fb2f43e",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9910e835580fef3bef53b70241dd00c4bffad693",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ed56a6b58222f9c1f4115a0bd2788dd6ed6022e2",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Cancel delayed I/O APIC EOI handling before destroying vCPUs\n\nCancel (and flush) the I/O APIC's delayed EOI handling work during the\n\"pre VM destroy\" phase, before vCPUs are destroyed, as processing the EOI\nbroadcast will inject another IRQ if the line is asserted, i.e. will try\nto deliver an IRQ to the target vCPU(s). Canceling the work after vCPUs\nare destroyed leads to UAF if the delayed work is processed after vCPUs are\ndestroyed.\n\n BUG: KASAN: slab-use-after-free in __kvm_irq_delivery_to_apic_fast+0x9bf/0xa20 arch/x86/kvm/lapic.c:1250\n Read of size 8 at addr ffff8880499abea0 by task kworker/1:2/1218\n\n CPU: 1 UID: 0 PID: 1218 Comm: kworker/1:2 Not tainted 7.1.0-rc7 #5 PREEMPT(lazy)\n 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\n Workqueue: events kvm_ioapic_eoi_inject_work\n Call Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:94\n dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378\n print_report+0x139/0x4ad mm/kasan/report.c:482\n kasan_report+0xe4/0x1d0 mm/kasan/report.c:595\n __kvm_irq_delivery_to_apic_fast+0x9bf/0xa20 arch/x86/kvm/lapic.c:1250\n __kvm_irq_delivery_to_apic+0xd8/0xbf0 arch/x86/kvm/lapic.c:1345\n kvm_irq_delivery_to_apic arch/x86/kvm/lapic.h:129\n ioapic_service+0x308/0x590 arch/x86/kvm/ioapic.c:492\n kvm_ioapic_eoi_inject_work+0x13c/0x190 arch/x86/kvm/ioapic.c:532\n process_one_work+0xa59/0x19a0 kernel/workqueue.c:3314\n process_scheduled_works kernel/workqueue.c:3397\n worker_thread+0x5eb/0xe50 kernel/workqueue.c:3478\n kthread+0x370/0x450 kernel/kthread.c:436\n ret_from_fork+0x72b/0xd30 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n </TASK>\n\nNote, the VM is unreachable once kvm_destroy_vm() starts, and scheduling\nnew work via kvm_ioapic_send_eoi() can only be done via KVM_RUN, i.e.\nrequires a live vCPU.\n\nAlternatively, KVM could simply destroy the I/O APIC during the \"pre\" phase\nof VM destruction, but that gets more than a bit sketchy as KVM expects the\nI/O APIC to exist if ioapic_in_kernel() is true, and nested virtualization\nin particular has a bad habit of touching VM-scope state during vCPU\ndestruction. E.g. attempting to free the PIC during the pre phase would\nlead to a NULL pointer dereference in kvm_cpu_has_extint(), and it's not\nhard to imagine the I/O APIC having a similar flaw."
}
],
"lastModified": "2026-08-23T13:16:45.563",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}