CVE-2026-74438

Technical Description

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'

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References