The Linux kernel contained an insecure and unused random number generator implementation in the sun4i-ss crypto module (sun4i_ss_rng). This code had multiple security flaws: sun4i_ss_prng_seed() lacked locking and had a buffer overflow vulnerability, and sun4i_ss_prng_generate() did not fill the output buffer completely and did not wait for hardware readiness before reading random bytes. No known userspace consumers rely on this code, which is only theoretically accessible via the AF_ALG 'rng' algorithm type. Because the code was unused and vulnerable, it was removed entirely rather than patched individually.

The vulnerabilities could lead to buffer overflow and weak random number generation if the sun4i_ss_rng code were used. However, since the code is unused and no userspace applications depend on it, the practical impact is minimal. The removal of this code eliminates these security risks.

The Linux kernel developers have removed the insecure and unused sun4i_ss_rng code, effectively resolving the vulnerabilities. Users should update to a Linux kernel version that includes this removal. No additional mitigation is required as the vulnerable code was unused.