Tom Hebb

**Name of the Vulnerable Software and Affected Versions** GCC versions prior to the fixed version **Description** A failure in the -fstack-protector feature in GCC-based toolchains that target AArch64 allows an attacker to exploit an existing buffer overflow in dynamically-sized local variables in an application without this being detected. This stack-protector failure only applies to C99-style dynamically-sized local variables or those created using `alloca()`. The stack-protector operates as intended for statically-sized local variables. The default behavior when the stack-protector detects an overflow is to terminate the application, resulting in controlled loss of availability. An attacker who can exploit a buffer overflow without triggering the stack-protector might be able to change program flow control to cause an uncontrolled loss of availability or to go further and affect confidentiality or integrity. **Recommendations** At the moment, there is no information about a newer version that contains a fix for this vulnerability.