CVE-2026-80831: Linux kernel · crypto: mxs-dcp – fix source scatterlist length access
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 14:05 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 4 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix has been implemented in the Linux kernel to address this issue by using the original scatterlist length instead of sg_dma_len() without proper mapping. Users should apply the official kernel update containing this fix. Patch status is not explicitly confirmed in the provided data; check the vendor advisory or Linux kernel mailing lists for the official patch and update guidance.
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.
References
- nvd.nist.gov/vuln/detail/CVE-2026-80831 (opens in a new tab)
- git.kernel.org/stable/c/04201dcc88b26eac52f736e39727fc5c420b7257 (opens in a new tab)
- git.kernel.org/stable/c/0e9edb108a63bbbef952dfcbc597e34ed9c1fb74 (opens in a new tab)
- git.kernel.org/stable/c/1537bd55b4f842565068c54b47cd2ae1777d5f8f (opens in a new tab)
- git.kernel.org/stable/c/182f16a20d329a1c818d51dad57d9bf43d356c7c (opens in a new tab)
- git.kernel.org/stable/c/6ef9a4afb52cb102ab038cd42352c142d8505d09 (opens in a new tab)
- git.kernel.org/stable/c/c5bcb084a9871e5b62afb5f48b60adfa13b5d9f8 (opens in a new tab)
- git.kernel.org/stable/c/da14fae5203b72ca71ccfa9af8de9249e40d533a (opens in a new tab)
- git.kernel.org/stable/c/e72a795df521cb65b7c4705cc11078cdacfaa2f4 (opens in a new tab)
- git.kernel.org/stable/c/fd0f211b27a6ec2ebd8c315683401b43adcc5511 (opens in a new tab)
- ubuntu.com/security/CVE-2026-80831 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-80831 (opens in a new tab)
- git.kernel.org/linus/c5bcb084a9871e5b62afb5f48b60adfa13b5d9f8 (opens in a new tab)