CVE-2024-26951
Vulnerability from cvelistv5
Published
2024-05-01 05:18
Modified
2024-11-05 09:18
Severity ?
Summary
wireguard: netlink: check for dangling peer via is_dead instead of empty list
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/13d107794304306164481d31ce33f8fdb25a9c04
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/302b2dfc013baca3dea7ceda383930d9297d231d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/55b6c738673871c9b0edae05d0c97995c1ff08c4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/710a177f347282eea162aec8712beb1f42d5ad87
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7bedfe4cfa38771840a355970e4437cd52d4046b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b7cea3a9af0853fdbb1b16633a458f991dde6aac
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f52be46e3e6ecefc2539119784324f0cbc09620a
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwireguard: netlink: check for dangling peer via is_dead instead of empty list\n\nIf all peers are removed via wg_peer_remove_all(), rather than setting\npeer_list to empty, the peer is added to a temporary list with a head on\nthe stack of wg_peer_remove_all(). If a netlink dump is resumed and the\ncursored peer is one that has been removed via wg_peer_remove_all(), it\nwill iterate from that peer and then attempt to dump freed peers.\n\nFix this by instead checking peer-\u003eis_dead, which was explictly created\nfor this purpose. Also move up the device_update_lock lockdep assertion,\nsince reading is_dead relies on that.\n\nIt can be reproduced by a small script like:\n\n    echo \"Setting config...\"\n    ip link add dev wg0 type wireguard\n    wg setconf wg0 /big-config\n    (\n            while true; do\n                    echo \"Showing config...\"\n                    wg showconf wg0 \u003e /dev/null\n            done\n    ) \u0026\n    sleep 4\n    wg setconf wg0 \u003c(printf \"[Peer]\\nPublicKey=$(wg genkey)\\n\")\n\nResulting in:\n\n    BUG: KASAN: slab-use-after-free in __lock_acquire+0x182a/0x1b20\n    Read of size 8 at addr ffff88811956ec70 by task wg/59\n    CPU: 2 PID: 59 Comm: wg Not tainted 6.8.0-rc2-debug+ #5\n    Call Trace:\n     \u003cTASK\u003e\n     dump_stack_lvl+0x47/0x70\n     print_address_description.constprop.0+0x2c/0x380\n     print_report+0xab/0x250\n     kasan_report+0xba/0xf0\n     __lock_acquire+0x182a/0x1b20\n     lock_acquire+0x191/0x4b0\n     down_read+0x80/0x440\n     get_peer+0x140/0xcb0\n     wg_get_device_dump+0x471/0x1130"
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    "dateReserved": "2024-02-19T14:20:24.198Z",
    "dateUpdated": "2024-11-05T09:18:47.060Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26951\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-01T06:15:11.223\",\"lastModified\":\"2024-11-05T10:16:09.697\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nwireguard: netlink: check for dangling peer via is_dead instead of empty list\\n\\nIf all peers are removed via wg_peer_remove_all(), rather than setting\\npeer_list to empty, the peer is added to a temporary list with a head on\\nthe stack of wg_peer_remove_all(). If a netlink dump is resumed and the\\ncursored peer is one that has been removed via wg_peer_remove_all(), it\\nwill iterate from that peer and then attempt to dump freed peers.\\n\\nFix this by instead checking peer-\u003eis_dead, which was explictly created\\nfor this purpose. Also move up the device_update_lock lockdep assertion,\\nsince reading is_dead relies on that.\\n\\nIt can be reproduced by a small script like:\\n\\n    echo \\\"Setting config...\\\"\\n    ip link add dev wg0 type wireguard\\n    wg setconf wg0 /big-config\\n    (\\n            while true; do\\n                    echo \\\"Showing config...\\\"\\n                    wg showconf wg0 \u003e /dev/null\\n            done\\n    ) \u0026\\n    sleep 4\\n    wg setconf wg0 \u003c(printf \\\"[Peer]\\\\nPublicKey=$(wg genkey)\\\\n\\\")\\n\\nResulting in:\\n\\n    BUG: KASAN: slab-use-after-free in __lock_acquire+0x182a/0x1b20\\n    Read of size 8 at addr ffff88811956ec70 by task wg/59\\n    CPU: 2 PID: 59 Comm: wg Not tainted 6.8.0-rc2-debug+ #5\\n    Call Trace:\\n     \u003cTASK\u003e\\n     dump_stack_lvl+0x47/0x70\\n     print_address_description.constprop.0+0x2c/0x380\\n     print_report+0xab/0x250\\n     kasan_report+0xba/0xf0\\n     __lock_acquire+0x182a/0x1b20\\n     lock_acquire+0x191/0x4b0\\n     down_read+0x80/0x440\\n     get_peer+0x140/0xcb0\\n     wg_get_device_dump+0x471/0x1130\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: wireguard: netlink: verifique si hay pares pendientes a trav\u00e9s de is_dead en lugar de una lista vac\u00eda. Si todos los pares se eliminan a trav\u00e9s de wg_peer_remove_all(), en lugar de configurar peer_list como vac\u00edo, 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 elimin\u00f3 mediante wg_peer_remove_all(), iterar\u00e1 desde ese par y luego intentar\u00e1 volcar los pares liberados. Para solucionar este problema, marque peer-\u0026gt;is_dead, que se cre\u00f3 expl\u00edcitamente para este prop\u00f3sito. Tambi\u00e9n suba la aserci\u00f3n de bloqueo de dispositivo_update_lock, ya que la lectura is_dead depende de eso. Se puede reproducir mediante un peque\u00f1o script como: echo \\\"Configuraci\u00f3n de configuraci\u00f3n...\\\" ip link add dev wg0 tipo wireguard wg setconf wg0 /big-config (mientras sea verdadero; haga echo \\\"Mostrando configuraci\u00f3n...\\\" wg showconf wg0 \u0026gt; / dev/null done) \u0026amp; sleep 4 wg setconf wg0 \u0026lt;(printf \\\"[Peer]\\\\nPublicKey=$(wg genkey)\\\\n\\\") Resultando en: ERROR: KASAN: slab-use-after-free en __lock_acquire+0x182a/0x1b20 Lectura de tama\u00f1o 8 en la direcci\u00f3n 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\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/13d107794304306164481d31ce33f8fdb25a9c04\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/302b2dfc013baca3dea7ceda383930d9297d231d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/55b6c738673871c9b0edae05d0c97995c1ff08c4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/710a177f347282eea162aec8712beb1f42d5ad87\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7bedfe4cfa38771840a355970e4437cd52d4046b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b7cea3a9af0853fdbb1b16633a458f991dde6aac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f52be46e3e6ecefc2539119784324f0cbc09620a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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