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

Vulnerability from cvelistv5 – Published: 2026-09-03 08:21 – Updated: 2026-10-20 13:15
VLAI

This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.

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        "dateUpdated": "2026-10-20T13:15:30.500Z",
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      "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",
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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"
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          "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"
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              "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."
                }
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            "dateUpdated": "2026-10-03T10:56:07.809Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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              "url": "https://git.kernel.org/stable/c/ec4eb5c2ef964bf398f07889265121c316561911"
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              "url": "https://git.kernel.org/stable/c/5ec42d57655c690234c14aece6dd3f209778c1d8"
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        "assignerShortName": "Linux",
        "cveId": "CVE-2026-80726",
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        "dateReserved": "2026-08-26T14:34:25.789Z",
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}



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