[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"repo-stars":3,"vuln-DEBIAN-CVE-2025-40181":6},{"stargazers_count":4,"fetched_at":5},7,"2026-07-30T21:17:53.703Z",{"id":7,"descriptions":8,"cisa":9,"weaknesses":10,"exploits":11,"aliases":12,"duplicate_of":9,"upstream":13,"downstream":16,"duplicates":17,"related":18,"reserved_at":9,"published_at":19,"modified_at":20,"state":9,"summary":21,"references_raw":23,"kevs":30,"epss":9,"epss_history":31,"metrics":32,"affected":33},"DEBIAN-CVE-2025-40181","In the Linux kernel, the following vulnerability has been resolved:  x86/kvm: Force legacy PCI hole to UC when overriding MTRRs for TDX/SNP  When running as an SNP or TDX guest under KVM, force the legacy PCI hole, i.e. memory between Top of Lower Usable DRAM and 4GiB, to be mapped as UC via a forced variable MTRR range.  In most KVM-based setups, legacy devices such as the HPET and TPM are enumerated via ACPI.  ACPI enumeration includes a Memory32Fixed entry, and optionally a SystemMemory descriptor for an OperationRegion, e.g. if the device needs to be accessed via a Control Method.  If a SystemMemory entry is present, then the kernel's ACPI driver will auto-ioremap the region so that it can be accessed at will.  However, the ACPI spec doesn't provide a way to enumerate the memory type of SystemMemory regions, i.e. there's no way to tell software that a region must be mapped as UC vs. WB, etc.  As a result, Linux's ACPI driver always maps SystemMemory regions using ioremap_cache(), i.e. as WB on x86.  The dedicated device drivers however, e.g. the HPET driver and TPM driver, want to map their associated memory as UC or WC, as accessing PCI devices using WB is unsupported.  On bare metal and non-CoCO, the conflicting requirements \"work\" as firmware configures the PCI hole (and other device memory) to be UC in the MTRRs. So even though the ACPI mappings request WB, they are forced to UC- in the kernel's tracking due to the kernel properly handling the MTRR overrides, and thus are compatible with the drivers' requested WC/UC-.  With force WB MTRRs on SNP and TDX guests, the ACPI mappings get their requested WB if the ACPI mappings are established before the dedicated driver code attempts to initialize the device.  E.g. if acpi_init() runs before the corresponding device driver is probed, ACPI's WB mapping will \"win\", and result in the driver's ioremap() failing because the existing WB mapping isn't compatible with the requested WC/UC-.  E.g. when a TPM is emulated by the hypervisor (ignoring the security implications of relying on what is allegedly an untrusted entity to store measurements), the TPM driver will request UC and fail:    [  1.730459] ioremap error for 0xfed40000-0xfed45000, requested 0x2, got 0x0   [  1.732780] tpm_tis MSFT0101:00: probe with driver tpm_tis failed with error -12  Note, the '0x2' and '0x0' values refer to \"enum page_cache_mode\", not x86's memtypes (which frustratingly are an almost pure inversion; 2 == WB, 0 == UC). E.g. tracing mapping requests for TPM TIS yields:   Mapping TPM TIS with req_type = 0  WARNING: CPU: 22 PID: 1 at arch/x86/mm/pat/memtype.c:530 memtype_reserve+0x2ab/0x460  Modules linked in:  CPU: 22 UID: 0 PID: 1 Comm: swapper/0 Tainted: G        W           6.16.0-rc7+ #2 VOLUNTARY  Tainted: [W]=WARN  Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/29/2025  RIP: 0010:memtype_reserve+0x2ab/0x460   __ioremap_caller+0x16d/0x3d0   ioremap_cache+0x17/0x30   x86_acpi_os_ioremap+0xe/0x20   acpi_os_map_iomem+0x1f3/0x240   acpi_os_map_memory+0xe/0x20   acpi_ex_system_memory_space_handler+0x273/0x440   acpi_ev_address_space_dispatch+0x176/0x4c0   acpi_ex_access_region+0x2ad/0x530   acpi_ex_field_datum_io+0xa2/0x4f0   acpi_ex_extract_from_field+0x296/0x3e0   acpi_ex_read_data_from_field+0xd1/0x460   acpi_ex_resolve_node_to_value+0x2ee/0x530   acpi_ex_resolve_to_value+0x1f2/0x540   acpi_ds_evaluate_name_path+0x11b/0x190   acpi_ds_exec_end_op+0x456/0x960   acpi_ps_parse_loop+0x27a/0xa50   acpi_ps_parse_aml+0x226/0x600   acpi_ps_execute_method+0x172/0x3e0   acpi_ns_evaluate+0x175/0x5f0   acpi_evaluate_object+0x213/0x490   acpi_evaluate_integer+0x6d/0x140   acpi_bus_get_status+0x93/0x150   acpi_add_single_object+0x43a/0x7c0   acpi_bus_check_add+0x149/0x3a0   acpi_bus_check_add_1+0x16/0x30   acpi_ns_walk_namespace+0x22c/0x360   acpi_walk_namespace+0x15c/0x170   acpi_bus_scan+0x1dd/0x200   acpi_scan_init+0xe5/0x2b0   acpi_init+0x264/0x5b0   do_one_i ---truncated---",null,[],[],[],[14],{"_key":15},"CVE-2025-40181",[],[],[],"2025-11-12T22:15:44.847Z","2026-06-15T18:48:21.763113658Z",{"cisa_kev":22,"cisa_ransomware":22,"cisa_vendor":9,"epss_severity":9,"epss_score":9,"severity":9,"severity_score":9,"severity_version":9,"severity_source":9,"severity_vector":9,"severity_status":9},false,[24],{"url":25,"sources":26,"tags":28},"https://security-tracker.debian.org/tracker/CVE-2025-40181",[27],"osv_debian",[29],"Advisory",[],[],[],[34],{"ecosystem":35,"name":36,"vendor":37,"product":36,"cpe_part":9,"purl_type":38,"purl_namespace":37,"purl_name":36,"source":9,"versions":39},"Debian","linux","debian","deb",[40,46],{"version":41,"is_range":42,"range_type":43,"version_start":9,"version_start_type":9,"version_end":44,"version_end_type":45,"fixed_in":9},"lt6_12_57_1",true,"ecosystem","6.12.57-1","excluding",{"version":47,"is_range":42,"range_type":43,"version_start":9,"version_start_type":9,"version_end":48,"version_end_type":45,"fixed_in":9},"lt6_17_6_1","6.17.6-1"]