CVE-2026-80726

Estado: RecibidaCrítica (9.3)—

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

KVM: x86/mmu: WARN and clear role.invalid when creating a child shadow page

Explicitly clear role.invalid when deriving a child shadow page's role from its parent to harden against bugs elsewhere in KVM, as violating KVM's invariant that invalid pages are NOT on the list of active MMU pages leads to use-after-free due to __kvm_mmu_prepare_zap_page() using list_add() instead of list_move() when processing an invalid shadow page, i.e. makes a bad situation far worse.

Yell loudly if the parent is invalid, as it means KVM has missed a validity check, i.e. KVM is attempting to map memory using an invalid/obsolete root, but continue on as the child is otherwise still a valid shadow page.

Detalles técnicos trazas, registros y código del informe original

  ==================================================================
  BUG: KASAN: slab-use-after-free in __kvm_mmu_get_shadow_page+0x1817/0x1860 [kvm]
  Write of size 8 at addr ff11000153dd1368 by task repro/853

  CPU: 1 UID: 1000 PID: 853 Comm: repro Not tainted 7.2.0-rc2-3aec122bdcaf-next-vm #5 PREEMPT
  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
  Call Trace:
   <TASK>
   dump_stack_lvl+0x4b/0x70
   print_report+0x153/0x49c
   kasan_report+0xbc/0xf0
   __kvm_mmu_get_shadow_page+0x1817/0x1860 [kvm]
   mmu_alloc_root+0x141/0x320 [kvm]
   kvm_mmu_load+0x612/0x20f0 [kvm]
   kvm_arch_vcpu_ioctl_run+0x3dd5/0x6150 [kvm]
   kvm_vcpu_ioctl+0x5e4/0x10d0 [kvm]
   __x64_sys_ioctl+0x131/0x1b0
   do_syscall_64+0x67/0x5f0
   entry_SYSCALL_64_after_hwframe+0x4b/0x53
   </TASK>

  Allocated by task 853:
   kasan_save_stack+0x20/0x40
   kasan_save_track+0x14/0x30
   __kasan_slab_alloc+0x5f/0x70
   kmem_cache_alloc_noprof+0xfe/0x2e0
   __kvm_mmu_topup_memory_cache+0x135/0x530 [kvm]
   paging64_page_fault+0x318/0x1e30 [kvm]
   kvm_mmu_do_page_fault+0x21d/0x630 [kvm]
   kvm_mmu_page_fault+0x18c/0x17b0 [kvm]
   kvm_arch_vcpu_ioctl_run+0x1f35/0x6150 [kvm]
   kvm_vcpu_ioctl+0x5e4/0x10d0 [kvm]
   __x64_sys_ioctl+0x131/0x1b0
   do_syscall_64+0x67/0x5f0
   entry_SYSCALL_64_after_hwframe+0x4b/0x53

  Freed by task 853:
   kasan_save_stack+0x20/0x40
   kasan_save_track+0x14/0x30
   kasan_save_free_info+0x3b/0x60
   __kasan_slab_free+0x43/0x70
   kmem_cache_free+0xe2/0x400
   kvm_mmu_commit_zap_page.part.0+0x1e2/0x310 [kvm]
   kvm_mmu_free_roots+0x283/0x560 [kvm]
   kvm_arch_vcpu_ioctl_run+0x33c8/0x6150 [kvm]
   kvm_vcpu_ioctl+0x5e4/0x10d0 [kvm]
   __x64_sys_ioctl+0x131/0x1b0
   do_syscall_64+0x67/0x5f0
   entry_SYSCALL_64_after_hwframe+0x4b/0x53

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.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %

Vulnerabilidad local (AV:L/PR:N) en kernel KVM que causa use-after-free en shadow pages. Permite escalada de privilegios o denegación de servicio mediante manipulación de estructuras de memoria del hipervisor.

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

Threat Intelligence Program Execution Prevention Application Isolation and Sandboxing Exploit Protection Update Software

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux Kernel^AI

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-80726",
  "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": "a770f6f28b1a9287189f3dc8333eb694d9a2f0ab",
              "lessThan": "ec4eb5c2ef964bf398f07889265121c316561911",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a770f6f28b1a9287189f3dc8333eb694d9a2f0ab",
              "lessThan": "9b7984692c18b22d6d61af3f53887fca7fddb0f1",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a770f6f28b1a9287189f3dc8333eb694d9a2f0ab",
              "lessThan": "f33ecb89d352348ed5e625f6747ac51ede254e1b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a770f6f28b1a9287189f3dc8333eb694d9a2f0ab",
              "lessThan": "0af4711862c5b818204d40b21f0859ad51c230e9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a770f6f28b1a9287189f3dc8333eb694d9a2f0ab",
              "lessThan": "66bc868a33cf1de43f22a94acd8857e0fe33393f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a770f6f28b1a9287189f3dc8333eb694d9a2f0ab",
              "lessThan": "9f7760a2e962cbda0d096a27d394d14ad4d22928",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a770f6f28b1a9287189f3dc8333eb694d9a2f0ab",
              "lessThan": "5ec42d57655c690234c14aece6dd3f209778c1d8",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "arch/x86/kvm/mmu/mmu.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.30"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.30",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "arch/x86/kvm/mmu/mmu.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-03T13:06:11.020",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0af4711862c5b818204d40b21f0859ad51c230e9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5ec42d57655c690234c14aece6dd3f209778c1d8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/66bc868a33cf1de43f22a94acd8857e0fe33393f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9b7984692c18b22d6d61af3f53887fca7fddb0f1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9f7760a2e962cbda0d096a27d394d14ad4d22928",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ec4eb5c2ef964bf398f07889265121c316561911",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f33ecb89d352348ed5e625f6747ac51ede254e1b",
      "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/mmu: WARN and clear role.invalid when creating a child shadow page\n\nExplicitly clear role.invalid when deriving a child shadow page's role from\nits parent to harden against bugs elsewhere in KVM, as violating KVM's\ninvariant that invalid pages are NOT on the list of active MMU pages leads\nto use-after-free due to __kvm_mmu_prepare_zap_page() using list_add()\ninstead of list_move() when processing an invalid shadow page, i.e. makes a\nbad situation far worse.\n\nYell loudly if the parent is invalid, as it means KVM has missed a validity\ncheck, i.e. KVM is attempting to map memory using an invalid/obsolete root,\nbut continue on as the child is otherwise still a valid shadow page.\n\n  ==================================================================\n  BUG: KASAN: slab-use-after-free in __kvm_mmu_get_shadow_page+0x1817/0x1860 [kvm]\n  Write of size 8 at addr ff11000153dd1368 by task repro/853\n\n  CPU: 1 UID: 1000 PID: 853 Comm: repro Not tainted 7.2.0-rc2-3aec122bdcaf-next-vm #5 PREEMPT\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n  Call Trace:\n   <TASK>\n   dump_stack_lvl+0x4b/0x70\n   print_report+0x153/0x49c\n   kasan_report+0xbc/0xf0\n   __kvm_mmu_get_shadow_page+0x1817/0x1860 [kvm]\n   mmu_alloc_root+0x141/0x320 [kvm]\n   kvm_mmu_load+0x612/0x20f0 [kvm]\n   kvm_arch_vcpu_ioctl_run+0x3dd5/0x6150 [kvm]\n   kvm_vcpu_ioctl+0x5e4/0x10d0 [kvm]\n   __x64_sys_ioctl+0x131/0x1b0\n   do_syscall_64+0x67/0x5f0\n   entry_SYSCALL_64_after_hwframe+0x4b/0x53\n   </TASK>\n\n  Allocated by task 853:\n   kasan_save_stack+0x20/0x40\n   kasan_save_track+0x14/0x30\n   __kasan_slab_alloc+0x5f/0x70\n   kmem_cache_alloc_noprof+0xfe/0x2e0\n   __kvm_mmu_topup_memory_cache+0x135/0x530 [kvm]\n   paging64_page_fault+0x318/0x1e30 [kvm]\n   kvm_mmu_do_page_fault+0x21d/0x630 [kvm]\n   kvm_mmu_page_fault+0x18c/0x17b0 [kvm]\n   kvm_arch_vcpu_ioctl_run+0x1f35/0x6150 [kvm]\n   kvm_vcpu_ioctl+0x5e4/0x10d0 [kvm]\n   __x64_sys_ioctl+0x131/0x1b0\n   do_syscall_64+0x67/0x5f0\n   entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\n  Freed by task 853:\n   kasan_save_stack+0x20/0x40\n   kasan_save_track+0x14/0x30\n   kasan_save_free_info+0x3b/0x60\n   __kasan_slab_free+0x43/0x70\n   kmem_cache_free+0xe2/0x400\n   kvm_mmu_commit_zap_page.part.0+0x1e2/0x310 [kvm]\n   kvm_mmu_free_roots+0x283/0x560 [kvm]\n   kvm_arch_vcpu_ioctl_run+0x33c8/0x6150 [kvm]\n   kvm_vcpu_ioctl+0x5e4/0x10d0 [kvm]\n   __x64_sys_ioctl+0x131/0x1b0\n   do_syscall_64+0x67/0x5f0\n   entry_SYSCALL_64_after_hwframe+0x4b/0x53"
    }
  ],
  "lastModified": "2026-10-03T11:17:39.647",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}