{
  "cveId": "CVE-2025-40184",
  "url": "https://patchblox.com/security/cve/CVE-2025-40184",
  "summary": "CVE-2025-40184 is fixed in linux on 1 platform by DEBIAN-CVE-2025-40184 (version 6.17.6-1), released November 12, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  KVM: arm64: Fix debug checking for np-guests usi...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  KVM: arm64: Fix debug checking for np-guests using huge mappings  When running with transparent huge pages and CONFIG_NVHE_EL2_DEBUG then the debug checking in assert_host_shared_guest() fails on the launch of an np-guest. This WARN_ON() causes a panic and generates the stack below.  In __pkvm_host_relax_perms_guest() the debug checking assumes the mapping is a single page but it may be a block map. Update the checking so that the size is not checked and just assumes the correct size.  While we\u0027re here make the same fix in __pkvm_host_mkyoung_guest().    Info: # lkvm run -k /share/arch/arm64/boot/Image -m 704 -c 8 --name guest-128   Info: Removed ghost socket file \u0022/.lkvm//guest-128.sock\u0022. [ 1406.521757] kvm [141]: nVHE hyp BUG at: arch/arm64/kvm/hyp/nvhe/mem_protect.c:1088! [ 1406.521804] kvm [141]: nVHE call trace: [ 1406.521828] kvm [141]:  [\u003Cffff8000811676b4\u003E] __kvm_nvhe_hyp_panic\u002B0xb4/0xe8 [ 1406.521946] kvm [141]:  [\u003Cffff80008116d12c\u003E] __kvm_nvhe_assert_host_shared_guest\u002B0xb0/0x10c [ 1406.522049] kvm [141]:  [\u003Cffff80008116f068\u003E] __kvm_nvhe___pkvm_host_relax_perms_guest\u002B0x48/0x104 [ 1406.522157] kvm [141]:  [\u003Cffff800081169df8\u003E] __kvm_nvhe_handle___pkvm_host_relax_perms_guest\u002B0x64/0x7c [ 1406.522250] kvm [141]:  [\u003Cffff800081169f0c\u003E] __kvm_nvhe_handle_trap\u002B0x8c/0x1a8 [ 1406.522333] kvm [141]:  [\u003Cffff8000811680fc\u003E] __kvm_nvhe___skip_pauth_save\u002B0x4/0x4 [ 1406.522454] kvm [141]: ---[ end nVHE call trace ]--- [ 1406.522477] kvm [141]: Hyp Offset: 0xfffece8013600000 [ 1406.522554] Kernel panic - not syncing: HYP panic: [ 1406.522554] PS:834003c9 PC:0000b1806db6d170 ESR:00000000f2000800 [ 1406.522554] FAR:ffff8000804be420 HPFAR:0000000000804be0 PAR:0000000000000000 [ 1406.522554] VCPU:0000000000000000 [ 1406.523337] CPU: 3 UID: 0 PID: 141 Comm: kvm-vcpu-0 Not tainted 6.16.0-rc7 #97 PREEMPT [ 1406.523485] Hardware name: FVP Base RevC (DT) [ 1406.523566] Call trace: [ 1406.523629]  show_stack\u002B0x18/0x24 (C) [ 1406.523753]  dump_stack_lvl\u002B0xd4/0x108 [ 1406.523899]  dump_stack\u002B0x18/0x24 [ 1406.524040]  panic\u002B0x3d8/0x448 [ 1406.524184]  nvhe_hyp_panic_handler\u002B0x10c/0x23c [ 1406.524325]  kvm_handle_guest_abort\u002B0x68c/0x109c [ 1406.524500]  handle_exit\u002B0x60/0x17c [ 1406.524630]  kvm_arch_vcpu_ioctl_run\u002B0x2e0/0x8c0 [ 1406.524794]  kvm_vcpu_ioctl\u002B0x1a8/0x9cc [ 1406.524919]  __arm64_sys_ioctl\u002B0xac/0x104 [ 1406.525067]  invoke_syscall\u002B0x48/0x10c [ 1406.525189]  el0_svc_common.constprop.0\u002B0x40/0xe0 [ 1406.525322]  do_el0_svc\u002B0x1c/0x28 [ 1406.525441]  el0_svc\u002B0x38/0x120 [ 1406.525588]  el0t_64_sync_handler\u002B0x10c/0x138 [ 1406.525750]  el0t_64_sync\u002B0x1ac/0x1b0 [ 1406.525876] SMP: stopping secondary CPUs [ 1406.525965] Kernel Offset: disabled [ 1406.526032] CPU features: 0x0000,00000080,8e134ca1,9446773f [ 1406.526130] Memory Limit: none [ 1406.959099] ---[ end Kernel panic - not syncing: HYP panic: [ 1406.959099] PS:834003c9 PC:0000b1806db6d170 ESR:00000000f2000800 [ 1406.959099] FAR:ffff8000804be420 HPFAR:0000000000804be0 PAR:0000000000000000 [ 1406.959099] VCPU:0000000000000000 ]",
  "published": "2025-11-12T22:15:45Z",
  "severity": "",
  "epss": 0.00198,
  "epssPercentile": 0.09658,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.17.6-1",
      "fix": "DEBIAN-CVE-2025-40184",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-40184",
      "released": "2025-11-12T22:15:45Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}