Use-After-Free Vulnerability in Linux Kernel Affects Socket Management

CVE-2023-53426

What is CVE-2023-53426?

A use-after-free vulnerability exists in the Linux kernel's xsk_diag interface, which can be exploited if the socket is accessed after being unbound from the device. This situation may arise when the socket is closed or if the associated network device is removed. The vulnerability was introduced when an older method for indicating an unbound socket was removed, which inadvertently left diagnostic code relying on this method operational. To rectify this, the new implementation introduces checks against the socket's state to prevent operations if the socket is in the XSK_UNBOUND state, thereby enhancing socket cleanup and management.

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