Specifically, Rowhammer is a common bit flip attack, which uses the electronic interaction between adjacent memory cells in DRAM to make the value of a cell change from 1 to 0 after a sufficient number of accesses, and vice versa. This kind of attack can cause data errors without accessing the target memory area, and with the continuous update of DRAM, the vulnerability will become more and more serious.
For more information, please refer to the relevant technical forums.