CVE-2024-26950: wireguard: netlink: access device through ctx instead of peer

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-01 · updated 2026-10-15
Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: wireguard: netlink: access device through ctx instead of peer The previous commit fixed a bug that led to a NULL peer->device being dereferenced. It's actually easier and faster performance-wise to instead get the device from ctx->wg. This semantically makes more sense too, since ctx->wg->peer_allowedips.seq is compared with ctx->allowedips_seq, basing them both in ctx. This also acts as a defence in depth provision against freed peers.

Affected products

Debian Linux: 10.0
Linux kernel: from 5.6 before 5.10.215; from 5.11 before 5.15.154; from 5.16 before 6.1.84; from 6.2 before 6.6.24; from 6.7 before 6.7.12; from 6.8 before 6.8.3 — fixed in 5.10.215, 5.15.154, 6.1.84, 6.6.24, 6.7.12, 6.8.3

How to fix

Upgrade to a fixed version: Linux kernel 5.10.215, 5.15.154, 6.1.84, 6.6.24. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2024-26950 or the next vulnerability affects your stack