CVE-2026-80834
Received Received - Intake

Linux Kernel crypto_rng Interface Removal in sun8i-ce

Publication date: 2026-09-04

Last updated on: 2026-09-04

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: crypto: sun8i-ce - 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-ce support which is one of the only remaining ones. Note that the sun8i-ce support for hwrng remains in place. That is the interface that actually matters. 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. There's no point in fixing this separately only to remove the code anyway, so this commit is marked with Fixes and Cc stable.

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Meta Information

Published
2026-09-04
Last Modified
2026-09-04
Generated
2026-09-04
AI Q&A
2026-09-04
EPSS Evaluated
N/A
NVD
CVE-2026-80834
EUVD
EUVD-2026-71284

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability involves the removal of the crypto_rng interface in the Linux kernel's sun8i-ce driver due to redundancy with other random number generation methods. The interface had a use-after-free bug in its generate function caused by improper handling of DMA shutdown during signal interrupts. The fix involves removing the entire interface rather than patching the bug.

Detection Guidance

This vulnerability is specific to the Linux kernel's sun8i-ce crypto module and does not have a network-based detection method. To check if your system is affected, verify if the sun8i-ce driver is loaded using commands like 'lsmod | grep sun8i_ce' or 'modinfo sun8i_ce'. If the module is loaded, your system may be vulnerable.

Impact Analysis

The impact is limited since the vulnerable crypto_rng interface was unused and is being removed. The actual hwrng interface remains intact. No direct user impact is expected beyond potential minor disruptions during kernel updates removing the deprecated code.

Mitigation Strategies

Since the vulnerability is in the unused crypto_rng interface of the sun8i-ce driver, the best mitigation is to unload the module if not needed. Use 'sudo rmmod sun8i_ce' to remove it. If the module is required, ensure your kernel is updated to a version where this driver is removed or patched.

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