CVE-2026-80833: crypto: sun8i-ss - Remove crypto_rng interface

CVE-2026-80833: crypto: sun8i-ss - Remove crypto_rng interface

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

Description
===========

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.

The Linux kernel CVE team has assigned CVE-2026-80833 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 5.10 with commit ac2614d721dea2ff273af19c6c5d508d58a2bb3e and fixed in 7.2.3 with commit 8ab58786b4c63b8f1b6c522f33bb67a3c8c2791f
	Issue introduced in 5.10 with commit ac2614d721dea2ff273af19c6c5d508d58a2bb3e and fixed in 7.3-rc1 with commit a78446ee6fae86ac8733f120e3ffce2e5d9384f5

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-80833
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/crypto/allwinner/Kconfig
	drivers/crypto/allwinner/sun8i-ss/Makefile
	drivers/crypto/allwinner/sun8i-ss/sun8i-ss-core.c
	drivers/crypto/allwinner/sun8i-ss/sun8i-ss-prng.c
	drivers/crypto/allwinner/sun8i-ss/sun8i-ss.h


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/8ab58786b4c63b8f1b6c522f33bb67a3c8c2791f
	https://git.kernel.org/stable/c/a78446ee6fae86ac8733f120e3ffce2e5d9384f5