{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80726",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-80726"
  ],
  "published": "2026-09-03T08:22:05Z",
  "summary": "KVM: x86/mmu: WARN and clear role.invalid when creating a child shadow page",
  "details": "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",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.183",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80726"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ec4eb5c2ef964bf398f07889265121c316561911"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9b7984692c18b22d6d61af3f53887fca7fddb0f1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f33ecb89d352348ed5e625f6747ac51ede254e1b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0af4711862c5b818204d40b21f0859ad51c230e9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/66bc868a33cf1de43f22a94acd8857e0fe33393f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9f7760a2e962cbda0d096a27d394d14ad4d22928"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5ec42d57655c690234c14aece6dd3f209778c1d8"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-03T11:04:09Z"
  }
}