FKIE_CVE-2024-26951

Vulnerability from fkie_nvd - Published: 2024-05-01 06:15 - Updated: 2025-12-23 18:55
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/13d107794304306164481d31ce33f8fdb25a9c04Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/302b2dfc013baca3dea7ceda383930d9297d231dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/55b6c738673871c9b0edae05d0c97995c1ff08c4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/710a177f347282eea162aec8712beb1f42d5ad87Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7bedfe4cfa38771840a355970e4437cd52d4046bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b7cea3a9af0853fdbb1b16633a458f991dde6aacPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f52be46e3e6ecefc2539119784324f0cbc09620aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/13d107794304306164481d31ce33f8fdb25a9c04Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/302b2dfc013baca3dea7ceda383930d9297d231dPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/55b6c738673871c9b0edae05d0c97995c1ff08c4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/710a177f347282eea162aec8712beb1f42d5ad87Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7bedfe4cfa38771840a355970e4437cd52d4046bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b7cea3a9af0853fdbb1b16633a458f991dde6aacPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f52be46e3e6ecefc2539119784324f0cbc09620aPatch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlThird Party Advisory
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
debian debian_linux 10.0
To clipboard 

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  "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"
    }
  ],
  "id": "CVE-2024-26951",
  "lastModified": "2025-12-23T18:55:20.920",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-05-01T06:15:11.223",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "description": [
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          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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