fkie_cve-2025-40184
Vulnerability from fkie_nvd
Published
2025-11-12 22:15
Modified
2025-11-14 16:42
Severity ?
Summary
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're 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 "/.lkvm//guest-128.sock". [ 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]: [<ffff8000811676b4>] __kvm_nvhe_hyp_panic+0xb4/0xe8 [ 1406.521946] kvm [141]: [<ffff80008116d12c>] __kvm_nvhe_assert_host_shared_guest+0xb0/0x10c [ 1406.522049] kvm [141]: [<ffff80008116f068>] __kvm_nvhe___pkvm_host_relax_perms_guest+0x48/0x104 [ 1406.522157] kvm [141]: [<ffff800081169df8>] __kvm_nvhe_handle___pkvm_host_relax_perms_guest+0x64/0x7c [ 1406.522250] kvm [141]: [<ffff800081169f0c>] __kvm_nvhe_handle_trap+0x8c/0x1a8 [ 1406.522333] kvm [141]: [<ffff8000811680fc>] __kvm_nvhe___skip_pauth_save+0x4/0x4 [ 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+0x18/0x24 (C) [ 1406.523753] dump_stack_lvl+0xd4/0x108 [ 1406.523899] dump_stack+0x18/0x24 [ 1406.524040] panic+0x3d8/0x448 [ 1406.524184] nvhe_hyp_panic_handler+0x10c/0x23c [ 1406.524325] kvm_handle_guest_abort+0x68c/0x109c [ 1406.524500] handle_exit+0x60/0x17c [ 1406.524630] kvm_arch_vcpu_ioctl_run+0x2e0/0x8c0 [ 1406.524794] kvm_vcpu_ioctl+0x1a8/0x9cc [ 1406.524919] __arm64_sys_ioctl+0xac/0x104 [ 1406.525067] invoke_syscall+0x48/0x10c [ 1406.525189] el0_svc_common.constprop.0+0x40/0xe0 [ 1406.525322] do_el0_svc+0x1c/0x28 [ 1406.525441] el0_svc+0x38/0x120 [ 1406.525588] el0t_64_sync_handler+0x10c/0x138 [ 1406.525750] el0t_64_sync+0x1ac/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 ]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2ba972bf71cb71d2127ec6c3db1ceb6dd0c73173
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4f7af3d8a1177c807d1f2563c7c171700b020656
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Fix debug checking for np-guests using huge mappings\n\nWhen running with transparent huge pages and CONFIG_NVHE_EL2_DEBUG then\nthe debug checking in assert_host_shared_guest() fails on the launch of an\nnp-guest. This WARN_ON() causes a panic and generates the stack below.\n\nIn __pkvm_host_relax_perms_guest() the debug checking assumes the mapping\nis a single page but it may be a block map. Update the checking so that\nthe size is not checked and just assumes the correct size.\n\nWhile we\u0027re here make the same fix in __pkvm_host_mkyoung_guest().\n\n  Info: # lkvm run -k /share/arch/arm64/boot/Image -m 704 -c 8 --name guest-128\n  Info: Removed ghost socket file \"/.lkvm//guest-128.sock\".\n[ 1406.521757] kvm [141]: nVHE hyp BUG at: arch/arm64/kvm/hyp/nvhe/mem_protect.c:1088!\n[ 1406.521804] kvm [141]: nVHE call trace:\n[ 1406.521828] kvm [141]:  [\u003cffff8000811676b4\u003e] __kvm_nvhe_hyp_panic+0xb4/0xe8\n[ 1406.521946] kvm [141]:  [\u003cffff80008116d12c\u003e] __kvm_nvhe_assert_host_shared_guest+0xb0/0x10c\n[ 1406.522049] kvm [141]:  [\u003cffff80008116f068\u003e] __kvm_nvhe___pkvm_host_relax_perms_guest+0x48/0x104\n[ 1406.522157] kvm [141]:  [\u003cffff800081169df8\u003e] __kvm_nvhe_handle___pkvm_host_relax_perms_guest+0x64/0x7c\n[ 1406.522250] kvm [141]:  [\u003cffff800081169f0c\u003e] __kvm_nvhe_handle_trap+0x8c/0x1a8\n[ 1406.522333] kvm [141]:  [\u003cffff8000811680fc\u003e] __kvm_nvhe___skip_pauth_save+0x4/0x4\n[ 1406.522454] kvm [141]: ---[ end nVHE call trace ]---\n[ 1406.522477] kvm [141]: Hyp Offset: 0xfffece8013600000\n[ 1406.522554] Kernel panic - not syncing: HYP panic:\n[ 1406.522554] PS:834003c9 PC:0000b1806db6d170 ESR:00000000f2000800\n[ 1406.522554] FAR:ffff8000804be420 HPFAR:0000000000804be0 PAR:0000000000000000\n[ 1406.522554] VCPU:0000000000000000\n[ 1406.523337] CPU: 3 UID: 0 PID: 141 Comm: kvm-vcpu-0 Not tainted 6.16.0-rc7 #97 PREEMPT\n[ 1406.523485] Hardware name: FVP Base RevC (DT)\n[ 1406.523566] Call trace:\n[ 1406.523629]  show_stack+0x18/0x24 (C)\n[ 1406.523753]  dump_stack_lvl+0xd4/0x108\n[ 1406.523899]  dump_stack+0x18/0x24\n[ 1406.524040]  panic+0x3d8/0x448\n[ 1406.524184]  nvhe_hyp_panic_handler+0x10c/0x23c\n[ 1406.524325]  kvm_handle_guest_abort+0x68c/0x109c\n[ 1406.524500]  handle_exit+0x60/0x17c\n[ 1406.524630]  kvm_arch_vcpu_ioctl_run+0x2e0/0x8c0\n[ 1406.524794]  kvm_vcpu_ioctl+0x1a8/0x9cc\n[ 1406.524919]  __arm64_sys_ioctl+0xac/0x104\n[ 1406.525067]  invoke_syscall+0x48/0x10c\n[ 1406.525189]  el0_svc_common.constprop.0+0x40/0xe0\n[ 1406.525322]  do_el0_svc+0x1c/0x28\n[ 1406.525441]  el0_svc+0x38/0x120\n[ 1406.525588]  el0t_64_sync_handler+0x10c/0x138\n[ 1406.525750]  el0t_64_sync+0x1ac/0x1b0\n[ 1406.525876] SMP: stopping secondary CPUs\n[ 1406.525965] Kernel Offset: disabled\n[ 1406.526032] CPU features: 0x0000,00000080,8e134ca1,9446773f\n[ 1406.526130] Memory Limit: none\n[ 1406.959099] ---[ end Kernel panic - not syncing: HYP panic:\n[ 1406.959099] PS:834003c9 PC:0000b1806db6d170 ESR:00000000f2000800\n[ 1406.959099] FAR:ffff8000804be420 HPFAR:0000000000804be0 PAR:0000000000000000\n[ 1406.959099] VCPU:0000000000000000 ]"
    }
  ],
  "id": "CVE-2025-40184",
  "lastModified": "2025-11-14T16:42:30.503",
  "metrics": {},
  "published": "2025-11-12T22:15:45.207",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2ba972bf71cb71d2127ec6c3db1ceb6dd0c73173"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4f7af3d8a1177c807d1f2563c7c171700b020656"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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