PT-2026-128161
CVE-2026-99168
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Published
2026-10-28
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Updated
2026-10-28
Description by
Score
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In 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.
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