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IronMonkey Threat Research

CVE-2024-26951 HIGH

Published: 2024-05-01 | Last Modified: 2026-08-04 | Status: Modified

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

Additional Descriptions (1)

En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: wireguard: netlink: verifique si hay pares pendientes a través de is_dead en lugar de una lista vacía. Si todos los pares se eliminan a través de wg_peer_remove_all(), en lugar de configurar peer_list como vacío, el par se agrega a una lista temporal. lista con un encabezado en la pila de wg_peer_remove_all(). Si se reanuda un volcado de netlink y el par seleccionado es uno que se eliminó mediante wg_peer_remove_all(), iterará desde ese par y luego intentará volcar los pares liberados. Para solucionar este problema, marque peer-&gt;is_dead, que se creó explícitamente para este propósito. También suba la aserción de bloqueo de dispositivo_update_lock, ya que la lectura is_dead depende de eso. Se puede reproducir mediante un pequeño script como: echo "Configuración de configuración..." ip link add dev wg0 tipo wireguard wg setconf wg0 /big-config (mientras sea verdadero; haga echo "Mostrando configuración..." wg showconf wg0 &gt; / dev/null done) &amp; sleep 4 wg setconf wg0 &lt;(printf "[Peer]\nPublicKey=$(wg genkey)\n") Resultando en: ERROR: KASAN: slab-use-after-free en __lock_acquire+0x182a/0x1b20 Lectura de tamaño 8 en la dirección ffff88811956ec70 mediante la tarea wg/59 CPU: 2 PID: 59 Comm: wg Not tainted 6.8.0-rc2-debug+ #5 Seguimiento de llamadas: 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

CVSS Metrics

Base Score: 7.8 (HIGH)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack VectorLOCAL
Attack ComplexityLOW
Privileges RequiredLOW
User InteractionNONE
ScopeUNCHANGED
Confidentiality ImpactHIGH
Integrity ImpactHIGH
Availability ImpactHIGH

Source: [email protected]

Type: Primary

Exploitability Score: 1.8

Impact Score: 5.9

Weaknesses

Source Type Description
[email protected] Primary
en CWE-416

Affected Products

Vendor Product Version Update Type
linux linux_kernel * <built-in method update of dict object at 0x7fd3408fd640> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd37034b7c0> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd37034a040> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd3694b51c0> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd3408fc200> Operating System
linux linux_kernel * <built-in method update of dict object at 0x7fd3694b4200> Operating System
debian debian_linux 10.0 <built-in method update of dict object at 0x7fd3408fd2c0> Operating System

Affected Configurations

Operator: OR

Vulnerable CPE
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Operator: OR

Vulnerable CPE
Yes cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

References