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CVE-2022-22715 is an elevation-of-privilege vulnerability in the Windows Named Pipe File System driver, npfs.sys, in the function NpTranslateContainerLocalAlias. The flaw is triggered during translation of named pipe paths using the LOCAL namespace for AppContainer or otherwise restricted callers. The vulnerable logic performs pipe-name size calculations with USHORT-sized values; a sufficiently long pipe name can cause integer overflow in the computed allocation size, and a leading backslash in the translated name can contribute to a subsequent length underflow. As a result, the driver may allocate an undersized paged-pool buffer and then pass an inconsistent length to RtlUnicodeStringPrintf, leading to an out-of-bounds kernel pool write. Successful exploitation enables corruption of adjacent kernel pool objects and can be developed into kernel read/write primitives and privilege escalation, including sandbox escape from an AppContainer context such as Adobe Reader.
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A Windows Named Pipe File System (npfs.sys) sandbox escape / local privilege escalation vulnerability caused by integer overflow and underflow in NpTranslateContainerLocalAlias when translating LOCAL\ named pipe paths for AppContainer or restricted tokens, leading to out-of-bounds kernel pool write.
Elevation of privilege vulnerability in Windows Named Pipe File System.
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Cross-references every affected SKU, including bundled OEM variants.
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