GHSA-3WC5-V6VV-97QX
Vulnerability from github – Published: 2026-10-28 12:31 – Updated: 2026-10-28 12:31In the Linux kernel, the following vulnerability has been resolved:
mshv_vtl: Check per-CPU register page before mmap
Register-page setup is optional for each CPU. If allocation or registration fails, mshv_vtl_configure_reg_page() warns and leaves that CPU's reg_page NULL, but initial context setup continues successfully. Meanwhile, successful setup on another CPU sets the global mshv_has_reg_page flag.
mshv_vtl_fault() checks this global flag before selecting the requested CPU's register page. With mixed setup results across online CPUs, the check passes even for a CPU with no register page, reaching get_page(NULL) when userspace faults in that mapping.
Check the selected per-CPU register page before taking its reference and return VM_FAULT_SIGBUS if it is absent.
{
"affected": [],
"aliases": [
"CVE-2026-99168"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-10-28T11:17:37Z",
"severity": null
},
"details": "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\u0027s 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\u0027s 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.",
"id": "GHSA-3wc5-v6vv-97qx",
"modified": "2026-10-28T12:31:06Z",
"published": "2026-10-28T12:31:06Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99168"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5c0757b065fbd140d8fbd05dc2c2146b713dfa68"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/874194a8de75fc2f4d1fb70c670b289b7e48f93e"
}
],
"schema_version": "1.4.0",
"severity": []
}
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Vulnerability timeline
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