Linux vulnerability

What happened

In the Linux kernel, the following vulnerability has been resolved: crypto: sun8i-ss - Remove crypto_rng interface Since the crypto_rng interface for hardware PRNGs is unused and is redundant with hwrng and the actual Linux RNG, it's being phased out. Most drivers for it were already removed. Go ahead and remove the sun8i-ss support which is one of the only remaining ones. As usual for crypto_rng, this driver was also buggy: its ->generate() function had a use-after-free vulnerability due to using wait_for_completion_interruptible_timeout() without handling shutting down the DMA operation if a signal is sent. Also, it had a buffer overread bug in the line 'memcpy(ctx->seed, d + dlen, ctx->slen);'. There's no point in fixing these bugs separately only to remove the code anyway, so this commit is marked with Fixes and Cc stable.

Affected versions

Linux: ac2614d721dea2ff273af19c6c5d508d58a2bb3e through before d29ccf9eeb67d775221e49a079caa1af83427afa (git); ac2614d721dea2ff273af19c6c5d508d58a2bb3e through before 7c257a295e05ceb8f78aa3efecc4e9ce19c3313f (git); ac2614d721dea2ff273af19c6c5d508d58a2bb3e through before 8ab58786b4c63b8f1b6c522f33bb67a3c8c2791f (git); ac2614d721dea2ff273af19c6c5d508d58a2bb3e through before a78446ee6fae86ac8733f120e3ffce2e5d9384f5 (git); 5.10 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.