Kshared Bypass ((new)) -

If an attacker can read the kernel's physical memory view (e.g., by using a driver or exploiting a kernel vulnerability), they can bypass all userland and most kernel callbacks. However, the KShared Bypass uses a userland-accessible read-only pointer inside KUSER_SHARED_DATA to access physical memory directly without kernel code.

A successful kshared bypass attack can have severe consequences, including: kshared bypass

// 3. Map the physical page containing remoteAddr (requires kernel RW) // This is the actual bypass – no NtReadVirtualMemory used. If an attacker can read the kernel's physical memory view (e

includes examining similar structures in Linux ( vsyscall , VDSO ) for analogous bypasses, and developing generic static analysis rules to detect physical memory traversal patterns. Map the physical page containing remoteAddr (requires kernel

kshared is a kernel module in Linux that provides a way to share kernel data between different kernel modules. It allows kernel modules to register and access shared data, such as variables, structures, or even functions.

The kshared bypass vulnerability typically involves manipulating the kernel's memory management or the kshared API to access or modify sensitive data. This can be achieved through various techniques, such as:

Because step 1 may require a syscall (e.g., NtQuerySystemInformation ), many “pure” bypasses fail. However, advanced implementations use the PsActiveProcessHead exported via KdDebuggerDataBlock to walk the process list and retrieve the DirectoryTableBase (CR3) from the EPROCESS structure — all via physical reads.