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

What is CVE-2024-26950?

CVE-2024-26950 is a high-severity vulnerability in Debian Debian Linux, published on 1 May 2024. 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:

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.

Weakness: CWE-476

Which versions are affected by CVE-2024-26950?

It affects 2 products.

Products include Debian Debian Linux, Linux kernel.

How do I fix CVE-2024-26950?

Apply the vendor's patch.

Is CVE-2024-26950 being exploited?

There is no known exploitation of CVE-2024-26950 in the wild and no public exploit code.

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All Debian Debian Linux vulnerabilities

Sources

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

Also known as BELL-CVE-2024-26950, DEBIAN-CVE-2024-26950, GHSA-265f-v3vf-6m77, UBUNTU-CVE-2024-26950.