Linux Kernel up to 7.2.2 sun8i-ss generate seed/slen use after free

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2.2. It has been classified as very critical. This vulnerability affects the function Generate of the component sun8i-ss. Performing a manipulation of the argument seed/slen results in use after free. This vulnerability is reported as CVE-2026-80833. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 7.2.2. This affects the function generate of the component sun8i-ss. The manipulation of the argument seed/slen with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-80833 since 08/26/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 09/04/2026).

Upgrading to version 7.2.3 or 7.3-rc1 eliminates this vulnerability. Applying the patch 8ab58786b4c63b8f1b6c522f33bb67a3c8c2791f/a78446ee6fae86ac8733f120e3ffce2e5d9384f5 is able to eliminate this problem.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.2.0
• 7.2.1
• 7.2.2

License

• open-source

Website

• Vendor: https://www.kernel.org/

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