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

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

Which versions are affected by CVE-2024-42247?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-42247?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

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 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-47504, AZL-47628, BELL-CVE-2024-42247, DEBIAN-CVE-2024-42247, GHSA-m475-c2qh-xg8v, UBUNTU-CVE-2024-42247.