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
References
Configurations
Configuration 1 (hide)
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Configuration 2 (hide)
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History
23 Dec 2025, 18:55
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
|
| References | () https://git.kernel.org/stable/c/13d107794304306164481d31ce33f8fdb25a9c04 - Patch | |
| References | () https://git.kernel.org/stable/c/302b2dfc013baca3dea7ceda383930d9297d231d - Patch | |
| References | () https://git.kernel.org/stable/c/55b6c738673871c9b0edae05d0c97995c1ff08c4 - Patch | |
| References | () https://git.kernel.org/stable/c/710a177f347282eea162aec8712beb1f42d5ad87 - Patch | |
| References | () https://git.kernel.org/stable/c/7bedfe4cfa38771840a355970e4437cd52d4046b - Patch | |
| References | () https://git.kernel.org/stable/c/b7cea3a9af0853fdbb1b16633a458f991dde6aac - Patch | |
| References | () https://git.kernel.org/stable/c/f52be46e3e6ecefc2539119784324f0cbc09620a - Patch | |
| References | () https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html - Third Party Advisory | |
| CWE | CWE-416 | |
| First Time |
Linux
Debian Debian debian Linux Linux linux Kernel |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.8 |
21 Nov 2024, 09:03
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
|
| References | () https://git.kernel.org/stable/c/13d107794304306164481d31ce33f8fdb25a9c04 - | |
| References | () https://git.kernel.org/stable/c/302b2dfc013baca3dea7ceda383930d9297d231d - | |
| References | () https://git.kernel.org/stable/c/55b6c738673871c9b0edae05d0c97995c1ff08c4 - | |
| References | () https://git.kernel.org/stable/c/710a177f347282eea162aec8712beb1f42d5ad87 - | |
| References | () https://git.kernel.org/stable/c/7bedfe4cfa38771840a355970e4437cd52d4046b - | |
| References | () https://git.kernel.org/stable/c/b7cea3a9af0853fdbb1b16633a458f991dde6aac - | |
| References | () https://git.kernel.org/stable/c/f52be46e3e6ecefc2539119784324f0cbc09620a - |
05 Nov 2024, 10:16
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
25 Jun 2024, 22:15
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
|
| Summary |
|
01 May 2024, 06:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2024-05-01 06:15
Updated : 2025-12-23 18:55
NVD link : CVE-2024-26951
Mitre link : CVE-2024-26951
CVE.ORG link : CVE-2024-26951
JSON object : View
Products Affected
debian
- debian_linux
linux
- linux_kernel
CWE
CWE-416
Use After Free