CVE-2022-50002 (GCVE-0-2022-50002)
Vulnerability from cvelistv5
Published
2025-06-18 11:01
Modified
2025-06-18 11:01
Severity ?
Summary
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. 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: [ 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
References
Impacted products
Vendor Product Version
Linux Linux Version: 8a66e45859797e5dd77ff17dd37781f99d5f5b9b
Version: 8a66e45859797e5dd77ff17dd37781f99d5f5b9b
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "4c040acf5744e87a7b3490f9ec8bedd0d15c9f29",
              "status": "affected",
              "version": "8a66e45859797e5dd77ff17dd37781f99d5f5b9b",
              "versionType": "git"
            },
            {
              "lessThan": "a6e675a66175869b7d87c0e1dd0ddf93e04f8098",
              "status": "affected",
              "version": "8a66e45859797e5dd77ff17dd37781f99d5f5b9b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx5/core/lag/lag.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.14"
            },
            {
              "lessThan": "5.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.6",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0",
                  "versionStartIncluding": "5.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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-\u003epf[MLX5_LAG_P0].dev and\nldev-\u003epf[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-\u003epf[MLX5_LAG_P0].dev and ldev-\u003epf[MLX5_LAG_P1].dev are set;\nclearing it is done right when either of ldev-\u003epf[i].netdev is cleared.\n\nConsider the following scenario:\n1. PF0 loads and sets ldev-\u003epf[MLX5_LAG_P0].dev to a valid pointer\n2. PF1 loads and sets both ldev-\u003epf[MLX5_LAG_P1].dev and\n   ldev-\u003epf[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-\u003epf[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 \u003c48\u003e 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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T11:01:02.653Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/4c040acf5744e87a7b3490f9ec8bedd0d15c9f29"
        },
        {
          "url": "https://git.kernel.org/stable/c/a6e675a66175869b7d87c0e1dd0ddf93e04f8098"
        }
      ],
      "title": "net/mlx5: LAG, fix logic over MLX5_LAG_FLAG_NDEVS_READY",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50002",
    "datePublished": "2025-06-18T11:01:02.653Z",
    "dateReserved": "2025-06-18T10:57:27.387Z",
    "dateUpdated": "2025-06-18T11:01:02.653Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50002\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:28.063\",\"lastModified\":\"2025-06-18T13:46:52.973\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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-\u003epf[MLX5_LAG_P0].dev and\\nldev-\u003epf[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-\u003epf[MLX5_LAG_P0].dev and ldev-\u003epf[MLX5_LAG_P1].dev are set;\\nclearing it is done right when either of ldev-\u003epf[i].netdev is cleared.\\n\\nConsider the following scenario:\\n1. PF0 loads and sets ldev-\u003epf[MLX5_LAG_P0].dev to a valid pointer\\n2. PF1 loads and sets both ldev-\u003epf[MLX5_LAG_P1].dev and\\n   ldev-\u003epf[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-\u003epf[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 \u003c48\u003e 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 l\u00f3gica sobre MLX5_LAG_FLAG_NDEVS_READY Solo establezca MLX5_LAG_FLAG_NDEVS_READY si ambos dispositivos de red est\u00e1n registrados. Hacerlo garantiza que tanto ldev-\u0026gt;pf[MLX5_LAG_P0].dev como ldev-\u0026gt;pf[MLX5_LAG_P1].dev tengan punteros v\u00e1lidos cuando MLX5_LAG_FLAG_NDEVS_READY est\u00e9 establecido. El problema principal es la asimetr\u00eda en la configuraci\u00f3n de MLX5_LAG_FLAG_NDEVS_READY y su borrado. La configuraci\u00f3n se realiza incorrectamente cuando tanto ldev-\u0026gt;pf[MLX5_LAG_P0].dev como ldev-\u0026gt;pf[MLX5_LAG_P1].dev est\u00e1n establecidos; Se borra correctamente cuando se borra ldev-\u0026gt;pf[i].netdev. Considere el siguiente escenario: 1. PF0 carga y asigna un puntero v\u00e1lido a ldev-\u0026gt;pf[MLX5_LAG_P0].dev. 2. PF1 carga y asigna punteros v\u00e1lidos a ldev-\u0026gt;pf[MLX5_LAG_P1].dev y ldev-\u0026gt;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-\u0026gt;pf[MLX5_LAG_P0].netdev. MLX5_LAG_FLAG_NDEVS_READY permanece configurado. La ejecuci\u00f3n posterior de mlx5_do_bond() dar\u00e1 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, direcci\u00f3n: 00000000000009a8 [ 1293.478756] #PF: acceso de lectura del supervisor en modo kernel [ 1293.481320] #PF: error_code(0x0000) - p\u00e1gina 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 est\u00e1ndar 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] C\u00f3digo: 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 \u0026lt;48\u0026gt; 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\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4c040acf5744e87a7b3490f9ec8bedd0d15c9f29\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a6e675a66175869b7d87c0e1dd0ddf93e04f8098\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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