{"id":"DEBIAN-CVE-2025-40184","details":"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]:  [\u003cffff8000811676b4\u003e] __kvm_nvhe_hyp_panic+0xb4/0xe8 [ 1406.521946] kvm [141]:  [\u003cffff80008116d12c\u003e] __kvm_nvhe_assert_host_shared_guest+0xb0/0x10c [ 1406.522049] kvm [141]:  [\u003cffff80008116f068\u003e] __kvm_nvhe___pkvm_host_relax_perms_guest+0x48/0x104 [ 1406.522157] kvm [141]:  [\u003cffff800081169df8\u003e] __kvm_nvhe_handle___pkvm_host_relax_perms_guest+0x64/0x7c [ 1406.522250] kvm [141]:  [\u003cffff800081169f0c\u003e] __kvm_nvhe_handle_trap+0x8c/0x1a8 [ 1406.522333] kvm [141]:  [\u003cffff8000811680fc\u003e] __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 ]","modified":"2026-08-27T22:47:54.667472864Z","published":"2025-11-12T22:15:45.207Z","upstream":["CVE-2025-40184"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-40184"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.17.6-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.2-1~exp1","6.17.5-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-40184.json"}}],"schema_version":"1.9.0"}