CVE-2026-80833

What the bug is

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.

Where it lives

The fix touches these files. If the subsystem is one you do not use, the practical exposure is lower, though the package is still the vulnerable one.

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

What this is

ALLWINNER CRYPTO DRIVERSMAINTAINERS section matched on drivers/crypto/allwinner/ · linux-crypto@vger.kernel.org · Maintained

Kernel module

none to look for. The file would have gone into sun8i_ss, and Debian does not compile it into that module, so finding sun8i_ss in lsmod would say nothing about this CVE.

Check it on the machine

grep -wE 'CONFIG_CRYPTO|CONFIG_CRYPTO_DEV_ALLWINNER|CONFIG_CRYPTO_DEV_SUN8I_SS' /boot/config-$(uname -r)

Reads the booted kernel's own configuration, on the machine and nowhere else. =y is built in, =m is a module, and an is not set line means the code is not there.

Show whether Debian builds this, per release

Debian does not build this code. In 5 releases below, every kernel flavour Debian publishes has the switch off, so the vulnerable file is compiled into no kernel binary Debian ships.

• bookworm, trixie, forky, sid, bookworm · linux-6.12n

n

not enabled on any flavour - this release does not build the code

Build switches

CONFIG_CRYPTO, CONFIG_CRYPTO_DEV_ALLWINNER, CONFIG_CRYPTO_DEV_SUN8I_SS

Reads as

all on means the file is compiled; any one off means it is not.

From the configuration Debian publishes for every kernel flavour it builds. It covers only the architectures Debian ships a linux-config package for, and nothing about a kernel you built yourself. Debian's own status above stays authoritative about the source package.MAINTAINERS kbuild Makefiles Debian linux-config packages

Signals

Published

2026-09-04 (44 days ago)source

CVSS

no vector published, unrated

Attack vector

not published

EPSS

0.18%, higher than 6.8% of all CVEssource

CISA KEV

not listedthe KEV catalogue

Debian urgency

not yet assignedsource

Subsystem

drivers/crypto

Upstream fixes

The versions the CNA records as introducing and fixing this, and the commit for each. source

Introduced	Fixed in	Commit
5.10	5.10.271	9127d2a88c17
5.10	5.15.222	64f3406ad082
5.10	6.1.189	6117968fe2cd
5.10	6.6.158	a41e4ba94ad4
5.10	6.12.109	d29ccf9eeb67
5.10	6.18.50	7c257a295e05
5.10	7.2.3	8ab58786b4c6
5.10	7.3	a78446ee6fae

Debian advisories