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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-08-07 · updated 2026-08-04
• Weakness: CWE-770

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]

Affected products

• Linux kernel: from 5.6 before 5.10.222; from 5.11 before 5.15.163; from 5.16 before 6.1.100; from 6.2 before 6.6.41; from 6.7 before 6.9.10 — fixed in 5.10.222, 5.15.163, 6.1.100, 6.6.41, 6.9.10

How to fix

Upgrade to a fixed version: Linux kernel 5.10.222, 5.15.163, 6.1.100, 6.6.41. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/217978a29c6ceca76d3c640bf94bdf50c268d801
• https://git.kernel.org/stable/c/2fb34bf76431e831f9863cd59adc0bd1f67b0fbf
• https://git.kernel.org/stable/c/6638a203abad35fa636d59ac47bdbc4bc100fd74
• https://git.kernel.org/stable/c/948f991c62a4018fb81d85804eeab3029c6209f8
• https://git.kernel.org/stable/c/ae630de24efb123d7199a43256396d7758f4cb75
• https://git.kernel.org/stable/c/b4764f0ad3d68de8a0b847c05f427afb86dd54e6
• https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

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