{"api_version":"1","generated_at":"2026-11-11T06:53:10+00:00","cve":"CVE-2026-99168","urls":{"html":"https://cve.report/CVE-2026-99168","api":"https://cve.report/api/cve/CVE-2026-99168.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-99168","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-99168"},"summary":{"title":"mshv_vtl: Check per-CPU register page before mmap","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmshv_vtl: Check per-CPU register page before mmap\n\nRegister-page setup is optional for each CPU. If allocation or\nregistration fails, mshv_vtl_configure_reg_page() warns and leaves that\nCPU's reg_page NULL, but initial context setup continues successfully.\nMeanwhile, successful setup on another CPU sets the global\nmshv_has_reg_page flag.\n\nmshv_vtl_fault() checks this global flag before selecting the requested\nCPU's register page. With mixed setup results across online CPUs, the\ncheck passes even for a CPU with no register page, reaching\nget_page(NULL) when userspace faults in that mapping.\n\nCheck the selected per-CPU register page before taking its reference and\nreturn VM_FAULT_SIGBUS if it is absent.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-28 11:17:37","updated_at":"2026-10-28 11:17:37"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/5c0757b065fbd140d8fbd05dc2c2146b713dfa68","name":"https://git.kernel.org/stable/c/5c0757b065fbd140d8fbd05dc2c2146b713dfa68","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/874194a8de75fc2f4d1fb70c670b289b7e48f93e","name":"https://git.kernel.org/stable/c/874194a8de75fc2f4d1fb70c670b289b7e48f93e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-99168","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99168","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7bfe3b8ea6e30437e01fcb8e4f56ef6e4d986d0f 5c0757b065fbd140d8fbd05dc2c2146b713dfa68 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7bfe3b8ea6e30437e01fcb8e4f56ef6e4d986d0f 874194a8de75fc2f4d1fb70c670b289b7e48f93e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.13 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/hv/mshv_vtl_main.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"5c0757b065fbd140d8fbd05dc2c2146b713dfa68","status":"affected","version":"7bfe3b8ea6e30437e01fcb8e4f56ef6e4d986d0f","versionType":"git"},{"lessThan":"874194a8de75fc2f4d1fb70c670b289b7e48f93e","status":"affected","version":"7bfe3b8ea6e30437e01fcb8e4f56ef6e4d986d0f","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/hv/mshv_vtl_main.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.19"},{"lessThan":"6.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.13","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.13","versionStartIncluding":"6.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"6.19","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmshv_vtl: Check per-CPU register page before mmap\n\nRegister-page setup is optional for each CPU. If allocation or\nregistration fails, mshv_vtl_configure_reg_page() warns and leaves that\nCPU's reg_page NULL, but initial context setup continues successfully.\nMeanwhile, successful setup on another CPU sets the global\nmshv_has_reg_page flag.\n\nmshv_vtl_fault() checks this global flag before selecting the requested\nCPU's register page. With mixed setup results across online CPUs, the\ncheck passes even for a CPU with no register page, reaching\nget_page(NULL) when userspace faults in that mapping.\n\nCheck the selected per-CPU register page before taking its reference and\nreturn VM_FAULT_SIGBUS if it is absent."}],"providerMetadata":{"dateUpdated":"2026-10-28T10:35:19.539Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/5c0757b065fbd140d8fbd05dc2c2146b713dfa68"},{"url":"https://git.kernel.org/stable/c/874194a8de75fc2f4d1fb70c670b289b7e48f93e"}],"title":"mshv_vtl: Check per-CPU register page before mmap","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-99168","datePublished":"2026-10-28T10:35:19.539Z","dateReserved":"2026-09-25T10:25:14.398Z","dateUpdated":"2026-10-28T10:35:19.539Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-28 11:17:37","lastModifiedDate":"2026-10-28 11:17:37","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"99168","Ordinal":"1","Title":"mshv_vtl: Check per-CPU register page before mmap","CVE":"CVE-2026-99168","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"99168","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nmshv_vtl: Check per-CPU register page before mmap\n\nRegister-page setup is optional for each CPU. If allocation or\nregistration fails, mshv_vtl_configure_reg_page() warns and leaves that\nCPU's reg_page NULL, but initial context setup continues successfully.\nMeanwhile, successful setup on another CPU sets the global\nmshv_has_reg_page flag.\n\nmshv_vtl_fault() checks this global flag before selecting the requested\nCPU's register page. With mixed setup results across online CPUs, the\ncheck passes even for a CPU with no register page, reaching\nget_page(NULL) when userspace faults in that mapping.\n\nCheck the selected per-CPU register page before taking its reference and\nreturn VM_FAULT_SIGBUS if it is absent.","Type":"Description","Title":"mshv_vtl: Check per-CPU register page before mmap"}]}}}