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

> A buffer overflow in the Linux kernel's CAAM crypto driver allows attackers to corrupt memory and potentially execute code or escalate privileges.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 8 May 2026
- **Updated:** 5 Aug 2026
- **Also known as:** BELL-CVE-2026-43330, DEBIAN-CVE-2026-43330, GHSA-7669-mcjm-pwg9, ROOT-OS-UBUNTU-2404-CVE-2026-43330, UBUNTU-CVE-2026-43330

## What is CVE-2026-43330?

CVE-2026-43330 is a high-severity vulnerability in Linux kernel, published on 8 May 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: 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.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2026-43330?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2026-43330?

Apply the vendor's patch.

## Is CVE-2026-43330 being exploited?

There is no known exploitation of CVE-2026-43330 in the wild and no public exploit code.

## Other vulnerabilities in Linux kernel

- [CVE-2026-53266](https://insights.sbomify.com/CVE-2026-53266/): Linux Kernel Out-of-Bounds Write (high 8.8, exploited in the wild)
- [CVE-2013-6282](https://insights.sbomify.com/CVE-2013-6282/): Linux Kernel Improper Input Validation (high 8.8, exploited in the wild)
- [CVE-2022-0185](https://insights.sbomify.com/CVE-2022-0185/): Linux Kernel Heap-Based Buffer Overflow (high 8.4, exploited in the wild)
- [CVE-2013-2094](https://insights.sbomify.com/CVE-2013-2094/): Linux Kernel Privilege Escalation (high 8.4, exploited in the wild)
- [CVE-2026-53362](https://insights.sbomify.com/CVE-2026-53362/): Linux Kernel Unspecified (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-43330 and fix it if it is affected.

What it is: CVE-2026-43330 is a high-severity vulnerability in Linux kernel, published on 8 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-43330 in the wild and no public exploit code.

Affected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-43330/ (Markdown: https://insights.sbomify.com/CVE-2026-43330/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-43330
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-43330
- OSV: https://osv.dev/vulnerability/CVE-2026-43330

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-43330/
Summaries are generated and may contain mistakes; the official description above is the record.