CVE-2024-50252

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

mlxsw: spectrum_ipip: Fix memory leak when changing remote IPv6 address

The device stores IPv6 addresses that are used for encapsulation in linear memory that is managed by the driver.

Changing the remote address of an ip6gre net device never worked properly, but since cited commit the following reproducer [1] would result in a warning [2] and a memory leak [3]. The problem is that the new remote address is never added by the driver to its hash table (and therefore the device) and the old address is never removed from it.

Fix by programming the new address when the configuration of the ip6gre net device changes and removing the old one. If the address did not change, then the above would result in increasing the reference count of the address and then decreasing it.

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[1] # ip link add name bla up type ip6gre local 2001:db8:1::1 remote 2001:db8:2::1 tos inherit ttl inherit # ip link set dev bla type ip6gre remote 2001:db8:3::1 # ip link del dev bla # devlink dev reload pci/0000:01:00.0

Detalles técnicos trazas, registros y código del informe original

[2]
WARNING: CPU: 0 PID: 1682 at drivers/net/ethernet/mellanox/mlxsw/spectrum.c:3002 mlxsw_sp_ipv6_addr_put+0x140/0x1d0
Modules linked in:
CPU: 0 UID: 0 PID: 1682 Comm: ip Not tainted 6.12.0-rc3-custom-g86b5b55bc835 #151
Hardware name: Nvidia SN5600/VMOD0013, BIOS 5.13 05/31/2023
RIP: 0010:mlxsw_sp_ipv6_addr_put+0x140/0x1d0
[...]
Call Trace:
 <TASK>
 mlxsw_sp_router_netdevice_event+0x55f/0x1240
 notifier_call_chain+0x5a/0xd0
 call_netdevice_notifiers_info+0x39/0x90
 unregister_netdevice_many_notify+0x63e/0x9d0
 rtnl_dellink+0x16b/0x3a0
 rtnetlink_rcv_msg+0x142/0x3f0
 netlink_rcv_skb+0x50/0x100
 netlink_unicast+0x242/0x390
 netlink_sendmsg+0x1de/0x420
 ____sys_sendmsg+0x2bd/0x320
 ___sys_sendmsg+0x9a/0xe0
 __sys_sendmsg+0x7a/0xd0
 do_syscall_64+0x9e/0x1a0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

[3]
unreferenced object 0xffff898081f597a0 (size 32):
  comm "ip", pid 1626, jiffies 4294719324
  hex dump (first 32 bytes):
    20 01 0d b8 00 02 00 00 00 00 00 00 00 00 00 01   ...............
    21 49 61 83 80 89 ff ff 00 00 00 00 01 00 00 00  !Ia.............
  backtrace (crc fd9be911):
    [<00000000df89c55d>] __kmalloc_cache_noprof+0x1da/0x260
    [<00000000ff2a1ddb>] mlxsw_sp_ipv6_addr_kvdl_index_get+0x281/0x340
    [<000000009ddd445d>] mlxsw_sp_router_netdevice_event+0x47b/0x1240
    [<00000000743e7757>] notifier_call_chain+0x5a/0xd0
    [<000000007c7b9e13>] call_netdevice_notifiers_info+0x39/0x90
    [<000000002509645d>] register_netdevice+0x5f7/0x7a0
    [<00000000c2e7d2a9>] ip6gre_newlink_common.isra.0+0x65/0x130
    [<0000000087cd6d8d>] ip6gre_newlink+0x72/0x120
    [<000000004df7c7cc>] rtnl_newlink+0x471/0xa20
    [<0000000057ed632a>] rtnetlink_rcv_msg+0x142/0x3f0
    [<0000000032e0d5b5>] netlink_rcv_skb+0x50/0x100
    [<00000000908bca63>] netlink_unicast+0x242/0x390
    [<00000000cdbe1c87>] netlink_sendmsg+0x1de/0x420
    [<0000000011db153e>] ____sys_sendmsg+0x2bd/0x320
    [<000000003b6d53eb>] ___sys_sendmsg+0x9a/0xe0
    [<00000000cae27c62>] __sys_sendmsg+0x7a/0xd0

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.22%
Percentil entre todas las CVEs puntuadas: 11
Fecha de la puntuación: 5/10/2026

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-401
CWE-401

Referencias

JSON original (NVD)

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{
  "id": "CVE-2024-50252",
  "cveTags": [],
  "metrics": {
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      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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            {
              "automatable": "no"
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          "timestamp": "2025-10-01T20:15:48.404342Z"
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  "published": "2024-11-09T11:15:10.973",
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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          "value": "CWE-401"
        }
      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmlxsw: spectrum_ipip: Fix memory leak when changing remote IPv6 address\n\nThe device stores IPv6 addresses that are used for encapsulation in\nlinear memory that is managed by the driver.\n\nChanging the remote address of an ip6gre net device never worked\nproperly, but since cited commit the following reproducer [1] would\nresult in a warning [2] and a memory leak [3]. The problem is that the\nnew remote address is never added by the driver to its hash table (and\ntherefore the device) and the old address is never removed from it.\n\nFix by programming the new address when the configuration of the ip6gre\nnet device changes and removing the old one. If the address did not\nchange, then the above would result in increasing the reference count of\nthe address and then decreasing it.\n\n[1]\n # ip link add name bla up type ip6gre local 2001:db8:1::1 remote 2001:db8:2::1 tos inherit ttl inherit\n # ip link set dev bla type ip6gre remote 2001:db8:3::1\n # ip link del dev bla\n # devlink dev reload pci/0000:01:00.0\n\n[2]\nWARNING: CPU: 0 PID: 1682 at drivers/net/ethernet/mellanox/mlxsw/spectrum.c:3002 mlxsw_sp_ipv6_addr_put+0x140/0x1d0\nModules linked in:\nCPU: 0 UID: 0 PID: 1682 Comm: ip Not tainted 6.12.0-rc3-custom-g86b5b55bc835 #151\nHardware name: Nvidia SN5600/VMOD0013, BIOS 5.13 05/31/2023\nRIP: 0010:mlxsw_sp_ipv6_addr_put+0x140/0x1d0\n[...]\nCall Trace:\n <TASK>\n mlxsw_sp_router_netdevice_event+0x55f/0x1240\n notifier_call_chain+0x5a/0xd0\n call_netdevice_notifiers_info+0x39/0x90\n unregister_netdevice_many_notify+0x63e/0x9d0\n rtnl_dellink+0x16b/0x3a0\n rtnetlink_rcv_msg+0x142/0x3f0\n netlink_rcv_skb+0x50/0x100\n netlink_unicast+0x242/0x390\n netlink_sendmsg+0x1de/0x420\n ____sys_sendmsg+0x2bd/0x320\n ___sys_sendmsg+0x9a/0xe0\n __sys_sendmsg+0x7a/0xd0\n do_syscall_64+0x9e/0x1a0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\n[3]\nunreferenced object 0xffff898081f597a0 (size 32):\n  comm \"ip\", pid 1626, jiffies 4294719324\n  hex dump (first 32 bytes):\n    20 01 0d b8 00 02 00 00 00 00 00 00 00 00 00 01   ...............\n    21 49 61 83 80 89 ff ff 00 00 00 00 01 00 00 00  !Ia.............\n  backtrace (crc fd9be911):\n    [<00000000df89c55d>] __kmalloc_cache_noprof+0x1da/0x260\n    [<00000000ff2a1ddb>] mlxsw_sp_ipv6_addr_kvdl_index_get+0x281/0x340\n    [<000000009ddd445d>] mlxsw_sp_router_netdevice_event+0x47b/0x1240\n    [<00000000743e7757>] notifier_call_chain+0x5a/0xd0\n    [<000000007c7b9e13>] call_netdevice_notifiers_info+0x39/0x90\n    [<000000002509645d>] register_netdevice+0x5f7/0x7a0\n    [<00000000c2e7d2a9>] ip6gre_newlink_common.isra.0+0x65/0x130\n    [<0000000087cd6d8d>] ip6gre_newlink+0x72/0x120\n    [<000000004df7c7cc>] rtnl_newlink+0x471/0xa20\n    [<0000000057ed632a>] rtnetlink_rcv_msg+0x142/0x3f0\n    [<0000000032e0d5b5>] netlink_rcv_skb+0x50/0x100\n    [<00000000908bca63>] netlink_unicast+0x242/0x390\n    [<00000000cdbe1c87>] netlink_sendmsg+0x1de/0x420\n    [<0000000011db153e>] ____sys_sendmsg+0x2bd/0x320\n    [<000000003b6d53eb>] ___sys_sendmsg+0x9a/0xe0\n    [<00000000cae27c62>] __sys_sendmsg+0x7a/0xd0"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mlxsw: spectrum_ipip: Corrige la pérdida de memoria al cambiar la dirección IPv6 remota El dispositivo almacena direcciones IPv6 que se utilizan para la encapsulación en la memoria lineal que administra el controlador. Cambiar la dirección remota de un dispositivo ip6gre net nunca funcionó correctamente, pero desde el commit citada, el siguiente reproductor [1] daría como resultado una advertencia [2] y una pérdida de memoria [3]. El problema es que el controlador nunca agrega la nueva dirección remota a su tabla hash (y, por lo tanto, al dispositivo) y la dirección anterior nunca se elimina de ella. Corrija programando la nueva dirección cuando cambie la configuración del dispositivo ip6gre net y eliminando la anterior. Si la dirección no cambiara, lo anterior daría como resultado un aumento en el recuento de referencia de la dirección y luego una disminución. [1] # ip link add name bla up type ip6gre local 2001:db8:1::1 remote 2001:db8:2::1 tos heritage ttl heritage # ip link set dev bla type ip6gre remote 2001:db8:3::1 # ip link del dev bla # devlink dev reload pci/0000:01:00.0 [2] ADVERTENCIA: CPU: 0 PID: 1682 en drivers/net/ethernet/mellanox/mlxsw/spectrum.c:3002 mlxsw_sp_ipv6_addr_put+0x140/0x1d0 Módulos vinculados: CPU: 0 UID: 0 PID: 1682 Comm: ip No contaminado 6.12.0-rc3-custom-g86b5b55bc835 #151 Nombre del hardware: Nvidia SN5600/VMOD0013, BIOS 5.13 31/05/2023 RIP: 0010:mlxsw_sp_ipv6_addr_put+0x140/0x1d0 [...] Seguimiento de llamadas:  mlxsw_sp_router_netdevice_event+0x55f/0x1240 notifier_call_chain+0x5a/0xd0 call_netdevice_notifiers_info+0x39/0x90 unregister_netdevice_many_notify+0x63e/0x9d0 rtnl_dellink+0x16b/0x3a0 rtnetlink_rcv_msg+0x142/0x3f0 netlink_rcv_skb+0x50/0x100 netlink_unicast+0x242/0x390 netlink_sendmsg+0x1de/0x420 ____sys_sendmsg+0x2bd/0x320 ___sys_sendmsg+0x9a/0xe0 __sys_sendmsg+0x7a/0xd0 do_syscall_64+0x9e/0x1a0 entry_SYSCALL_64_after_hwframe+0x77/0x7f [3] objeto sin referencia 0xffff898081f597a0 (tamaño 32): comm \"ip\", pid 1626, jiffies 4294719324 volcado hexadecimal (primeros 32 bytes): 20 01 0d b8 00 02 00 00 00 00 00 00 00 00 00 01 ............... 21 49 61 83 80 89 y siguientes y siguientes 00 00 00 00 01 00 00 00 !Ia............. seguimiento inverso (crc fd9be911): [&lt;00000000df89c55d&gt;] __kmalloc_cache_noprof+0x1da/0x260 [&lt;00000000ff2a1ddb&gt;] mlxsw_sp_ipv6_addr_kvdl_index_get+0x281/0x340 [&lt;000000009ddd445d&gt;] mlxsw_sp_router_netdevice_event+0x47b/0x1240 [&lt;00000000743e7757&gt;] cadena_de_llamadas_de_notificador+0x5a/0xd0 [&lt;000000007c7b9e13&gt;] información_de_notificadores_de_dispositivo_de_red_de_llamada+0x39/0x90 [&lt;000000002509645d&gt;] registro_dispositivo_de_red+0x5f7/0x7a0 [&lt;00000000c2e7d2a9&gt;] ip6gre_newlink_common.isra.0+0x65/0x130 [&lt;0000000087cd6d8d&gt;] ip6gre_newlink+0x72/0x120 [&lt;000000004df7c7cc&gt;] rtnl_newlink+0x471/0xa20 [&lt;0000000057ed632a&gt;] rtnetlink_rcv_msg+0x142/0x3f0 [&lt;0000000032e0d5b5&gt;] netlink_rcv_skb+0x50/0x100 [&lt;00000000908bca63&gt;] netlink_unicast+0x242/0x390 [&lt;00000000cdbe1c87&gt;] netlink_sendmsg+0x1de/0x420 [&lt;0000000011db153e&gt;] ____sys_sendmsg+0x2bd/0x320 [&lt;000000003b6d53eb&gt;] ___sys_sendmsg+0x9a/0xe0 [&lt;00000000cae27c62&gt;] __sys_sendmsg+0x7a/0xd0"
    }
  ],
  "lastModified": "2026-06-17T08:04:00.910",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "252AD171-75DB-4B57-93D9-E5FBF4064DC7",
              "versionEndExcluding": "6.1.116",
              "versionStartIncluding": "5.17"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "75088E5E-2400-4D20-915F-7A65C55D9CCD",
              "versionEndExcluding": "6.6.60",
              "versionStartIncluding": "6.2"
            },
            {
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              "vulnerable": true,
              "matchCriteriaId": "E96F53A4-5E87-4A70-BD9A-BC327828D57F",
              "versionEndExcluding": "6.11.7",
              "versionStartIncluding": "6.7"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7F361E1D-580F-4A2D-A509-7615F73167A1"
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            {
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              "vulnerable": true,
              "matchCriteriaId": "24DBE6C7-2AAE-4818-AED2-E131F153D2FA"
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          "operator": "OR"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}