CVE-2025-40184 (GCVE-0-2025-40184)
Vulnerability from cvelistv5
Published
2025-11-12 21:56
Modified
2025-11-12 21:56
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
Impacted products
Vendor Product Version
Linux Linux Version: f28f1d02f4eaac05c2ad6bf7264a8696dc21d011
Version: f28f1d02f4eaac05c2ad6bf7264a8696dc21d011
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kvm/hyp/nvhe/mem_protect.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4f7af3d8a1177c807d1f2563c7c171700b020656",
              "status": "affected",
              "version": "f28f1d02f4eaac05c2ad6bf7264a8696dc21d011",
              "versionType": "git"
            },
            {
              "lessThan": "2ba972bf71cb71d2127ec6c3db1ceb6dd0c73173",
              "status": "affected",
              "version": "f28f1d02f4eaac05c2ad6bf7264a8696dc21d011",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/kvm/hyp/nvhe/mem_protect.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.4",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18-rc1",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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 ]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-11-12T21:56:28.044Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4f7af3d8a1177c807d1f2563c7c171700b020656"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ba972bf71cb71d2127ec6c3db1ceb6dd0c73173"
        }
      ],
      "title": "KVM: arm64: Fix debug checking for np-guests using huge mappings",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40184",
    "datePublished": "2025-11-12T21:56:28.044Z",
    "dateReserved": "2025-04-16T07:20:57.177Z",
    "dateUpdated": "2025-11-12T21:56:28.044Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40184\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-11-12T22:15:45.207\",\"lastModified\":\"2025-11-14T16:42:30.503\",\"vulnStatus\":\"Awaiting Analysis\",\"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 ]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2ba972bf71cb71d2127ec6c3db1ceb6dd0c73173\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4f7af3d8a1177c807d1f2563c7c171700b020656\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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