CVE-2026-74438
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the Linux kernel's sun4i-ss driver, the insecure and unused RNG algorithm (sun4i_ss_rng) was removed. It had multiple vulnerabilities including missing locking, buffer overflow, and improper random byte generation. Since no users are known, the code was removed instead of fixed.
Risk Assessment
The risk is low because the code is unused, but if exploited, it could lead to buffer overflow or weak random data, compromising cryptographic security.
Recommendation
Update the kernel to a version that removes this code. No further action is required as the functionality is not used.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: crypto: sun4i-ss - Remove insecure and unused rng_alg Remove sun4i_ss_rng, as it is insecure and unused: - It has multiple vulnerabilities. sun4i_ss_prng_seed() is missing locking and has a buffer overflow. sun4i_ss_prng_generate() fails to fill the entire buffer with cryptographic random bytes, because it rounds the destination length down and also doesn't actually wait for the hardware to be ready before pulling bytes from it. - No user of this code is known. It's usable only theoretically via the "rng" algorithm type of AF_ALG. But userspace actually just uses the actual Linux RNG (/dev/random etc) instead. And rng_algs don't contribute entropy to the actual Linux RNG either. (This may have been confused with hwrng, which does contribute entropy.) The sun4i_ss_prng_seed() buffer overflow was reported by Tianchu Chen and discovered by Atuin - Automated Vulnerability Discovery Engine There's no point in fixing all these vulnerabilities individually when this is unused code, so let's just remove it.