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CVE-2022-50002

Estado: AnalizadaMedia (5.5)—

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

net/mlx5: LAG, fix logic over MLX5_LAG_FLAG_NDEVS_READY

Only set MLX5_LAG_FLAG_NDEVS_READY if both netdevices are registered. Doing so guarantees that both ldev->pf[MLX5_LAG_P0].dev and ldev->pf[MLX5_LAG_P1].dev have valid pointers when MLX5_LAG_FLAG_NDEVS_READY is set.

The core issue is asymmetry in setting MLX5_LAG_FLAG_NDEVS_READY and clearing it. Setting it is done wrongly when both ldev->pf[MLX5_LAG_P0].dev and ldev->pf[MLX5_LAG_P1].dev are set; clearing it is done right when either of ldev->pf[i].netdev is cleared.

Consider the following scenario: 1. PF0 loads and sets ldev->pf[MLX5_LAG_P0].dev to a valid pointer 2.

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PF1 loads and sets both ldev->pf[MLX5_LAG_P1].dev and ldev->pf[MLX5_LAG_P1].netdev with valid pointers. This results in MLX5_LAG_FLAG_NDEVS_READY is set. 3. PF0 is unloaded before setting dev->pf[MLX5_LAG_P0].netdev. MLX5_LAG_FLAG_NDEVS_READY remains set.

Further execution of mlx5_do_bond() will result in null pointer dereference when calling mlx5_lag_is_multipath()

This patch fixes the following call trace actually encountered:

Detalles técnicos trazas, registros y código del informe original
[ 1293.475195] BUG: kernel NULL pointer dereference, address: 00000000000009a8
[ 1293.478756] #PF: supervisor read access in kernel mode
[ 1293.481320] #PF: error_code(0x0000) - not-present page
[ 1293.483686] PGD 0 P4D 0
[ 1293.484434] Oops: 0000 [#1] SMP PTI
[ 1293.485377] CPU: 1 PID: 23690 Comm: kworker/u16:2 Not tainted 5.18.0-rc5_for_upstream_min_debug_2022_05_05_10_13 #1
[ 1293.488039] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
[ 1293.490836] Workqueue: mlx5_lag mlx5_do_bond_work [mlx5_core]
[ 1293.492448] RIP: 0010:mlx5_lag_is_multipath+0x5/0x50 [mlx5_core]
[ 1293.494044] Code: e8 70 40 ff e0 48 8b 14 24 48 83 05 5c 1a 1b 00 01 e9 19 ff ff ff 48 83 05 47 1a 1b 00 01 eb d7 0f 1f 44 00 00 0f 1f 44 00 00 <48> 8b 87 a8 09 00 00 48 85 c0 74 26 48 83 05 a7 1b 1b 00 01 41 b8
[ 1293.498673] RSP: 0018:ffff88811b2fbe40 EFLAGS: 00010202
[ 1293.500152] RAX: ffff88818a94e1c0 RBX: ffff888165eca6c0 RCX: 0000000000000000
[ 1293.501841] RDX: 0000000000000001 RSI: ffff88818a94e1c0 RDI: 0000000000000000
[ 1293.503585] RBP: 0000000000000000 R08: ffff888119886740 R09: ffff888165eca73c
[ 1293.505286] R10: 0000000000000018 R11: 0000000000000018 R12: ffff88818a94e1c0
[ 1293.506979] R13: ffff888112729800 R14: 0000000000000000 R15: ffff888112729858
[ 1293.508753] FS:  0000000000000000(0000) GS:ffff88852cc40000(0000) knlGS:0000000000000000
[ 1293.510782] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1293.512265] CR2: 00000000000009a8 CR3: 00000001032d4002 CR4: 0000000000370ea0
[ 1293.514001] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1293.515806] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

CVSS

Probabilidad de explotación (EPSS)

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

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2022-50002",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "8a66e45859797e5dd77ff17dd37781f99d5f5b9b",
              "lessThan": "4c040acf5744e87a7b3490f9ec8bedd0d15c9f29",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "8a66e45859797e5dd77ff17dd37781f99d5f5b9b",
              "lessThan": "a6e675a66175869b7d87c0e1dd0ddf93e04f8098",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.14"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.14",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.19.6",
              "versionType": "semver",
              "lessThanOrEqual": "5.19.*"
            },
            {
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-06-18T11:15:28.063",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/4c040acf5744e87a7b3490f9ec8bedd0d15c9f29",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a6e675a66175869b7d87c0e1dd0ddf93e04f8098",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: LAG, fix logic over MLX5_LAG_FLAG_NDEVS_READY\n\nOnly set MLX5_LAG_FLAG_NDEVS_READY if both netdevices are registered.\nDoing so guarantees that both ldev->pf[MLX5_LAG_P0].dev and\nldev->pf[MLX5_LAG_P1].dev have valid pointers when\nMLX5_LAG_FLAG_NDEVS_READY is set.\n\nThe core issue is asymmetry in setting MLX5_LAG_FLAG_NDEVS_READY and\nclearing it. Setting it is done wrongly when both\nldev->pf[MLX5_LAG_P0].dev and ldev->pf[MLX5_LAG_P1].dev are set;\nclearing it is done right when either of ldev->pf[i].netdev is cleared.\n\nConsider the following scenario:\n1. PF0 loads and sets ldev->pf[MLX5_LAG_P0].dev to a valid pointer\n2. PF1 loads and sets both ldev->pf[MLX5_LAG_P1].dev and\n   ldev->pf[MLX5_LAG_P1].netdev with valid pointers. This results in\n   MLX5_LAG_FLAG_NDEVS_READY is set.\n3. PF0 is unloaded before setting dev->pf[MLX5_LAG_P0].netdev.\n   MLX5_LAG_FLAG_NDEVS_READY remains set.\n\nFurther execution of mlx5_do_bond() will result in null pointer\ndereference when calling mlx5_lag_is_multipath()\n\nThis patch fixes the following call trace actually encountered:\n\n[ 1293.475195] BUG: kernel NULL pointer dereference, address: 00000000000009a8\n[ 1293.478756] #PF: supervisor read access in kernel mode\n[ 1293.481320] #PF: error_code(0x0000) - not-present page\n[ 1293.483686] PGD 0 P4D 0\n[ 1293.484434] Oops: 0000 [#1] SMP PTI\n[ 1293.485377] CPU: 1 PID: 23690 Comm: kworker/u16:2 Not tainted 5.18.0-rc5_for_upstream_min_debug_2022_05_05_10_13 #1\n[ 1293.488039] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\n[ 1293.490836] Workqueue: mlx5_lag mlx5_do_bond_work [mlx5_core]\n[ 1293.492448] RIP: 0010:mlx5_lag_is_multipath+0x5/0x50 [mlx5_core]\n[ 1293.494044] Code: e8 70 40 ff e0 48 8b 14 24 48 83 05 5c 1a 1b 00 01 e9 19 ff ff ff 48 83 05 47 1a 1b 00 01 eb d7 0f 1f 44 00 00 0f 1f 44 00 00 <48> 8b 87 a8 09 00 00 48 85 c0 74 26 48 83 05 a7 1b 1b 00 01 41 b8\n[ 1293.498673] RSP: 0018:ffff88811b2fbe40 EFLAGS: 00010202\n[ 1293.500152] RAX: ffff88818a94e1c0 RBX: ffff888165eca6c0 RCX: 0000000000000000\n[ 1293.501841] RDX: 0000000000000001 RSI: ffff88818a94e1c0 RDI: 0000000000000000\n[ 1293.503585] RBP: 0000000000000000 R08: ffff888119886740 R09: ffff888165eca73c\n[ 1293.505286] R10: 0000000000000018 R11: 0000000000000018 R12: ffff88818a94e1c0\n[ 1293.506979] R13: ffff888112729800 R14: 0000000000000000 R15: ffff888112729858\n[ 1293.508753] FS:  0000000000000000(0000) GS:ffff88852cc40000(0000) knlGS:0000000000000000\n[ 1293.510782] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 1293.512265] CR2: 00000000000009a8 CR3: 00000001032d4002 CR4: 0000000000370ea0\n[ 1293.514001] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[ 1293.515806] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/mlx5: LAG, corregir la lógica sobre MLX5_LAG_FLAG_NDEVS_READY Solo establezca MLX5_LAG_FLAG_NDEVS_READY si ambos dispositivos de red están registrados. Hacerlo garantiza que tanto ldev-&gt;pf[MLX5_LAG_P0].dev como ldev-&gt;pf[MLX5_LAG_P1].dev tengan punteros válidos cuando MLX5_LAG_FLAG_NDEVS_READY esté establecido. El problema principal es la asimetría en la configuración de MLX5_LAG_FLAG_NDEVS_READY y su borrado. La configuración se realiza incorrectamente cuando tanto ldev-&gt;pf[MLX5_LAG_P0].dev como ldev-&gt;pf[MLX5_LAG_P1].dev están establecidos; Se borra correctamente cuando se borra ldev-&gt;pf[i].netdev. Considere el siguiente escenario: 1. PF0 carga y asigna un puntero válido a ldev-&gt;pf[MLX5_LAG_P0].dev. 2. PF1 carga y asigna punteros válidos a ldev-&gt;pf[MLX5_LAG_P1].dev y ldev-&gt;pf[MLX5_LAG_P1].netdev. Esto da como resultado que MLX5_LAG_FLAG_NDEVS_READY se configure. 3. PF0 se descarga antes de asignar dev-&gt;pf[MLX5_LAG_P0].netdev. MLX5_LAG_FLAG_NDEVS_READY permanece configurado. La ejecución posterior de mlx5_do_bond() dará como resultado una desreferencia de puntero nulo al llamar a mlx5_lag_is_multipath(). Este parche corrige el siguiente seguimiento de llamada encontrado: [ 1293.475195] ERROR: desreferencia de puntero NULL del kernel, dirección: 00000000000009a8 [ 1293.478756] #PF: acceso de lectura del supervisor en modo kernel [ 1293.481320] #PF: error_code(0x0000) - página no presente [ 1293.483686] PGD 0 P4D 0 [ 1293.484434] Oops: 0000 [#1] SMP PTI [ 1293.485377] CPU: 1 PID: 23690 Comm: kworker/u16:2 No contaminado 5.18.0-rc5_for_upstream_min_debug_2022_05_05_10_13 #1 [ 1293.488039] Nombre del hardware: PC estándar QEMU (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 01/04/2014 [ 1293.490836] Cola de trabajo: mlx5_lag mlx5_do_bond_work [mlx5_core] [ 1293.492448] RIP: 0010:mlx5_lag_is_multipath+0x5/0x50 [mlx5_core] [ 1293.494044] Código: e8 70 40 ff e0 48 8b 14 24 48 83 05 5c 1a 1b 00 01 e9 19 ff ff ff 48 83 05 47 1a 1b 00 01 eb d7 0f 1f 44 00 00 0f 1f 44 00 00 &lt;48&gt; 8b 87 a8 09 00 00 48 85 c0 74 26 48 83 05 a7 1b 1b 00 01 41 b8 [ 1293.498673] RSP: 0018:ffff88811b2fbe40 EFLAGS: 00010202 [ 1293.500152] RAX: ffff88818a94e1c0 RBX: ffff888165eca6c0 RCX: 0000000000000000 [ 1293.501841] RDX: 0000000000000001 RSI: ffff88818a94e1c0 RDI: 0000000000000000 [ 1293.503585] RBP: 0000000000000000 R08: ffff888119886740 R09: ffff888165eca73c [ 1293.505286] R10: 0000000000000018 R11: 0000000000000018 R12: ffff88818a94e1c0 [ 1293.506979] R13: ffff888112729800 R14: 0000000000000000 R15: ffff888112729858 [ 1293.508753] FS: 000000000000000(0000) GS:ffff88852cc40000(0000) knlGS:0000000000000000 [ 1293.510782] CS: 0010 DS: 0000 ES: 0000 CR0: 000000080050033 [ 1293.512265] CR2: 00000000000009a8 CR3: 00000001032d4002 CR4: 0000000000370ea0 [ 1293.514001] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1293.515806] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400"
    }
  ],
  "lastModified": "2026-06-17T05:22:31.917",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "8B955B56-B0DA-4F0C-BA88-42BEC5555237",
              "versionEndExcluding": "5.19.6",
              "versionStartIncluding": "5.14"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E8BD11A3-8643-49B6-BADE-5029A0117325"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5F0AD220-F6A9-4012-8636-155F1B841FAD"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}