{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-40184", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.177Z", "datePublished": "2025-11-12T21:56:28.044Z", "dateUpdated": "2026-05-11T21:44:23.140Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:44:23.140Z" }, "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're 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]: [] __kvm_nvhe_hyp_panic+0xb4/0xe8\n[ 1406.521946] kvm [141]: [] __kvm_nvhe_assert_host_shared_guest+0xb0/0x10c\n[ 1406.522049] kvm [141]: [] __kvm_nvhe___pkvm_host_relax_perms_guest+0x48/0x104\n[ 1406.522157] kvm [141]: [] __kvm_nvhe_handle___pkvm_host_relax_perms_guest+0x64/0x7c\n[ 1406.522250] kvm [141]: [] __kvm_nvhe_handle_trap+0x8c/0x1a8\n[ 1406.522333] kvm [141]: [] __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 ]" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/arm64/kvm/hyp/nvhe/mem_protect.c" ], "versions": [ { "version": "f28f1d02f4eaac05c2ad6bf7264a8696dc21d011", "lessThan": "4f7af3d8a1177c807d1f2563c7c171700b020656", "status": "affected", "versionType": "git" }, { "version": "f28f1d02f4eaac05c2ad6bf7264a8696dc21d011", "lessThan": "2ba972bf71cb71d2127ec6c3db1ceb6dd0c73173", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "arch/arm64/kvm/hyp/nvhe/mem_protect.c" ], "versions": [ { "version": "6.16", "status": "affected" }, { "version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver" }, { "version": "6.17.4", "lessThanOrEqual": "6.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.17.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.18" } ] } ] } ], "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" } } } }