mshv_vtl: Check per-CPU register page before mmap

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-99168
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-28 11:17:37 UTC
Updated2026-10-28 11:17:37 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7bfe3b8ea6e30437e01fcb8e4f56ef6e4d986d0f 5c0757b065fbd140d8fbd05dc2c2146b713dfa68 git Not specified
CNA Linux Linux affected 7bfe3b8ea6e30437e01fcb8e4f56ef6e4d986d0f 874194a8de75fc2f4d1fb70c670b289b7e48f93e git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 7.2.13 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5c0757b065fbd140d8fbd05dc2c2146b713dfa68 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/874194a8de75fc2f4d1fb70c670b289b7e48f93e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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