CVE-2026-80726 (GCVE-0-2026-80726)

Vulnerability from cvelistv5 – Published: 2026-09-03 08:21 – Updated: 2026-09-04 04:58
VLAI
Title
KVM: x86/mmu: WARN and clear role.invalid when creating a child shadow page
Summary
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. ================================================================== 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
Severity
9.3 (Critical)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a770f6f28b1a9287189f3dc8333eb694d9a2f0ab , < 9b7984692c18b22d6d61af3f53887fca7fddb0f1 (git)
Affected: a770f6f28b1a9287189f3dc8333eb694d9a2f0ab , < f33ecb89d352348ed5e625f6747ac51ede254e1b (git)
Affected: a770f6f28b1a9287189f3dc8333eb694d9a2f0ab , < 0af4711862c5b818204d40b21f0859ad51c230e9 (git)
Affected: a770f6f28b1a9287189f3dc8333eb694d9a2f0ab , < 66bc868a33cf1de43f22a94acd8857e0fe33393f (git)
Affected: a770f6f28b1a9287189f3dc8333eb694d9a2f0ab , < 9f7760a2e962cbda0d096a27d394d14ad4d22928 (git)
Affected: a770f6f28b1a9287189f3dc8333eb694d9a2f0ab , < 5ec42d57655c690234c14aece6dd3f209778c1d8 (git)
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Linux Linux Affected: 2.6.30
Unaffected: 0 , < 2.6.30 (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/mmu/mmu.c"
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      "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\u0027s role from\nits parent to harden against bugs elsewhere in KVM, as violating KVM\u0027s\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   \u003cTASK\u003e\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   \u003c/TASK\u003e\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"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached only through host KVM x86 shadow-MMU handling on the KVM_RUN ioctl path (kvm_arch_vcpu_ioctl_run -\u003e kvm_mmu_page_fault/kvm_mmu_load -\u003e __kvm_mmu_get_shadow_page), driven by guest page faults and root reloads, not by remote network or physical input.\nAC:L - The reproducer (UID 1000) triggers this reliably by combining guest page-table churn with MMU reclaim (make_mmu_pages_available/kvm_mmu_zap_oldest_mmu_pages) so an in-use root is zapped invalid while children are still created; the attacker controls both fault and reclaim sides of the race.\nPR:N - Exploitation requires only code running inside an already-running KVM guest (or equivalent guest-driven KVM_RUN activity); no host root, CAP_SYS_ADMIN, or direct /dev/kvm access is needed beyond what any cloud VM tenant or compromised guest process already has.\nUI:N - Once the attacker can execute in the guest, triggering the fault/reclaim sequence is entirely self-driven through guest memory and paging behavior with no action required from another user or administrator.\nS:C - Corrupting host KVM MMU active_mmu_pages/list state from guest-controlled faults crosses the guest-to-host virtualization boundary and can compromise the host kernel beyond the guest security domain, enabling VM escape-class impact.\nC:H - The demonstrated slab use-after-free and broken active-list invariant (invalid children left linked while __kvm_mmu_prepare_zap_page uses list_add instead of list_move) provide attacker-influenced host heap corruption that can be leveraged for arbitrary kernel memory reads.\nI:H - The same UAF and doubly-linked list corruption on host kvm_mmu_page objects are writable memory-corruption primitives suitable for control-flow or structure hijacking, not merely benign accounting errors.\nA:H - KASAN reports a host slab UAF with an 8-byte write in __kvm_mmu_get_shadow_page, and list corruption on active_mmu_pages can cause host oops, panic, or hang, denying service to the host and co-located VMs."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T04:58:16.442Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9b7984692c18b22d6d61af3f53887fca7fddb0f1"
        },
        {
          "url": "https://git.kernel.org/stable/c/f33ecb89d352348ed5e625f6747ac51ede254e1b"
        },
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          "url": "https://git.kernel.org/stable/c/0af4711862c5b818204d40b21f0859ad51c230e9"
        },
        {
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        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/5ec42d57655c690234c14aece6dd3f209778c1d8"
        }
      ],
      "title": "KVM: x86/mmu: WARN and clear role.invalid when creating a child shadow page",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80726",
    "datePublished": "2026-09-03T08:21:45.923Z",
    "dateReserved": "2026-08-26T14:34:25.789Z",
    "dateUpdated": "2026-09-04T04:58:16.442Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80726",
      "date": "2026-09-21",
      "epss": "0.00177",
      "percentile": "0.07519"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-11T01:47:17.000Z",
      "cve": "CVE-2026-80726",
      "id": "msrc_CVE-2026-80726",
      "initial_release_date": "2026-09-04T01:05:53.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "KVM: x86/mmu: WARN and clear role.invalid when creating a child shadow page",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80726.json",
      "version": "2"
    },
    "nvd": {
      "cve": {
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          {
            "affectedData": [
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                    "status": "unaffected",
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "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\u0027s role from\nits parent to harden against bugs elsewhere in KVM, as violating KVM\u0027s\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   \u003cTASK\u003e\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   \u003c/TASK\u003e\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"
          }
        ],
        "id": "CVE-2026-80726",
        "lastModified": "2026-09-04T05:17:13.427",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 9.3,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.5,
              "impactScore": 6.0,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-03T13:06:11.020",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "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/f33ecb89d352348ed5e625f6747ac51ede254e1b"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-07T06:07:51+00:00",
      "cve": "CVE-2026-80726",
      "id": "CVE-2026-80726",
      "initial_release_date": "2026-09-03T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: KVM: x86/mmu: WARN and clear role.invalid when creating a child shadow page",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80726.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.