CVE-2026-80831
Published Sep 4, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: crypto: mxs-dcp - fix source scatterlist length access mxs_dcp_aes_block_crypt() uses sg_dma_len() without mapping the source scatterlist with dma_map_sg() first. Therefore, sg_dma_len() is invalid and could return zero or a stale DMA length, causing encryption and decryption to process the wrong number of bytes when CONFIG_NEED_SG_DMA_LENGTH=y. Use the original scatterlist length instead.
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EPSS — Exploit Prediction
0.0017
Probability of exploitation
0.06%
Percentile rank
EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.
References
Other References
https://git.kernel.org/stable/c/04201dcc88b26eac52f736e39727fc5c420b7257
https://git.kernel.org/stable/c/0e9edb108a63bbbef952dfcbc597e34ed9c1fb74
https://git.kernel.org/stable/c/1537bd55b4f842565068c54b47cd2ae1777d5f8f
https://git.kernel.org/stable/c/182f16a20d329a1c818d51dad57d9bf43d356c7c
https://git.kernel.org/stable/c/6ef9a4afb52cb102ab038cd42352c142d8505d09
https://git.kernel.org/stable/c/c5bcb084a9871e5b62afb5f48b60adfa13b5d9f8
https://git.kernel.org/stable/c/da14fae5203b72ca71ccfa9af8de9249e40d533a
https://git.kernel.org/stable/c/e72a795df521cb65b7c4705cc11078cdacfaa2f4
https://git.kernel.org/stable/c/fd0f211b27a6ec2ebd8c315683401b43adcc5511
Frequently Asked Questions
What is CVE-2026-80831? +
In the Linux kernel, the following vulnerability has been resolved:
crypto: mxs-dcp - fix source scatterlist length access
mxs_dcp_aes_block_crypt() uses sg_dma_len() without mapping the source
scatterlist with dma_map_sg() first. Therefore, sg_dma_len() is invalid
and could return zero or a stale DMA length, causing encryption and
decryption to process the wrong number of bytes when
CONFIG_NEED_SG_DMA_LENGTH=y.
Use the original scatterlist length instead.
How do I check if I'm vulnerable to CVE-2026-80831? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.