CVE-2026-80833
Received Received - Intake

Buffer Overread in Linux Kernel Crypto Subsystem

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-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.

CVSS Scores

EPSS Scores

Probability:
Percentile:

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-2026-80833
EUVD
EUVD-2026-71283

Affected Vendors & Products

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

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-UNKNOWN

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability involves a use-after-free and buffer overread bug in the Linux kernel's sun8i-ss crypto driver. The driver's crypto_rng interface had a flawed generate function that could lead to memory corruption when handling signals during DMA operations. The code is being removed entirely as it is redundant with other Linux RNG components.

Detection Guidance

This vulnerability is specific to the Linux kernel's sun8i-ss crypto driver and does not have a network-based detection method. To check if your system is affected, verify the kernel version and whether the sun8i-ss module is loaded using commands like 'uname -a' and 'lsmod | grep sun8i_ss'.

Impact Analysis

If exploited, this vulnerability could allow an attacker to cause memory corruption, potentially leading to system crashes or privilege escalation. However, since the affected code is being removed and no active drivers rely on it, the practical impact is likely minimal.

Mitigation Strategies

Update your Linux kernel to a version that includes the fix for CVE-2026-80833. If you are using a distribution that provides kernel updates, apply them immediately. Alternatively, remove or disable the sun8i-ss module if it is not required.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-80833. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart