# CVE-2024-42247: wireguard: allowedips: avoid unaligned 64-bit memory accesses

> Unaligned memory access in WireGuard allowedips on parisc platforms causes kernel warnings, potentially leading to denial of service.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 7 Aug 2024
- **Updated:** 5 Aug 2026
- **Also known as:** AZL-47504, AZL-47628, BELL-CVE-2024-42247, DEBIAN-CVE-2024-42247, GHSA-m475-c2qh-xg8v, UBUNTU-CVE-2024-42247

## What is CVE-2024-42247?

CVE-2024-42247 is a high-severity denial of service vulnerability in Linux kernel, published on 7 Aug 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

wireguard: allowedips: avoid unaligned 64-bit memory accesses

On the parisc platform, the kernel issues kernel warnings because
swap_endian() tries to load a 128-bit IPv6 address from an unaligned
memory location:

 Kernel: unaligned access to 0x55f4688c in wg_allowedips_insert_v6+0x2c/0x80 [wireguard] (iir 0xf3010df)
 Kernel: unaligned access to 0x55f46884 in wg_allowedips_insert_v6+0x38/0x80 [wireguard] (iir 0xf2010dc)

Avoid such unaligned memory accesses by instead using the
get_unaligned_be64() helper macro.

[Jason: replace src[8] in original patch with src+8]

Weakness: CWE-770 (Allocation of Resources Without Limits or Throttling)

## Which versions are affected by CVE-2024-42247?

It affects 1 product.


Products: Linux kernel.

## How do I fix CVE-2024-42247?

Apply the vendor's patch.

## Is CVE-2024-42247 being exploited?

There is no known exploitation of CVE-2024-42247 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-2024-42247 and fix it if it is affected.

What it is: CVE-2024-42247 is a high-severity denial of service vulnerability in Linux kernel, published on 7 Aug 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2024-42247 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-2024-42247/ (Markdown: https://insights.sbomify.com/CVE-2024-42247/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-42247
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-42247
- OSV: https://osv.dev/vulnerability/CVE-2024-42247

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-42247/
Summaries are generated and may contain mistakes; the official description above is the record.