CVE-2026-80831 crypto: mxs-dcp - fix source scatterlist length access
A flaw in the Linux kernel's MXS DCP crypto driver causes incorrect data processing due to invalid DMA length access, potentially leading to data corruption or leakage.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80831?
CVE-2026-80831 is a vulnerability in Linux, published on 4 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-80831?
How do I fix CVE-2026-80831?
Apply the vendor's patch.
Is CVE-2026-80831 being exploited?
There is no known exploitation of CVE-2026-80831 in the wild and no public exploit code.
Sources
Also known as AZL-99402, BELL-CVE-2026-80831, DEBIAN-CVE-2026-80831, GHSA-fv42-pvcm-2c76, UBUNTU-CVE-2026-80831.