FKIE_CVE-2026-22985

Vulnerability from fkie_nvd - Published: 2026-01-23 16:15 - Updated: 2026-04-02 12:16
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: idpf: Fix RSS LUT NULL pointer crash on early ethtool operations The RSS LUT is not initialized until the interface comes up, causing the following NULL pointer crash when ethtool operations like rxhash on/off are performed before the interface is brought up for the first time. Move RSS LUT initialization from ndo_open to vport creation to ensure LUT is always available. This enables RSS configuration via ethtool before bringing the interface up. Simplify LUT management by maintaining all changes in the driver's soft copy and programming zeros to the indirection table when rxhash is disabled. Defer HW programming until the interface comes up if it is down during rxhash and LUT configuration changes. Steps to reproduce: ** Load idpf driver; interfaces will be created modprobe idpf ** Before bringing the interfaces up, turn rxhash off ethtool -K eth2 rxhash off [89408.371875] BUG: kernel NULL pointer dereference, address: 0000000000000000 [89408.371908] #PF: supervisor read access in kernel mode [89408.371924] #PF: error_code(0x0000) - not-present page [89408.371940] PGD 0 P4D 0 [89408.371953] Oops: Oops: 0000 [#1] SMP NOPTI <snip> [89408.372052] RIP: 0010:memcpy_orig+0x16/0x130 [89408.372310] Call Trace: [89408.372317] <TASK> [89408.372326] ? idpf_set_features+0xfc/0x180 [idpf] [89408.372363] __netdev_update_features+0x295/0xde0 [89408.372384] ethnl_set_features+0x15e/0x460 [89408.372406] genl_family_rcv_msg_doit+0x11f/0x180 [89408.372429] genl_rcv_msg+0x1ad/0x2b0 [89408.372446] ? __pfx_ethnl_set_features+0x10/0x10 [89408.372465] ? __pfx_genl_rcv_msg+0x10/0x10 [89408.372482] netlink_rcv_skb+0x58/0x100 [89408.372502] genl_rcv+0x2c/0x50 [89408.372516] netlink_unicast+0x289/0x3e0 [89408.372533] netlink_sendmsg+0x215/0x440 [89408.372551] __sys_sendto+0x234/0x240 [89408.372571] __x64_sys_sendto+0x28/0x30 [89408.372585] x64_sys_call+0x1909/0x1da0 [89408.372604] do_syscall_64+0x7a/0xfa0 [89408.373140] ? clear_bhb_loop+0x60/0xb0 [89408.373647] entry_SYSCALL_64_after_hwframe+0x76/0x7e [89408.378887] </TASK> <snip>
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/83f38f210b85676f40ba8586b5a8edae19b56995Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b29a5a7dd1f4293ee49c469938c25bf85a5aa802Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/df2790b5228fbd3ed415b70a231cffdad0431618
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
linux linux_kernel 6.19
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{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "C006C634-C236-4B4B-B7FA-AF44C3098505",
              "versionEndExcluding": "6.18.6",
              "versionStartIncluding": "6.7",
              "vulnerable": true
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              "criteria": "cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "17B67AA7-40D6-4AFA-8459-F200F3D7CFD1",
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nidpf: Fix RSS LUT NULL pointer crash on early ethtool operations\n\nThe RSS LUT is not initialized until the interface comes up, causing\nthe following NULL pointer crash when ethtool operations like rxhash on/off\nare performed before the interface is brought up for the first time.\n\nMove RSS LUT initialization from ndo_open to vport creation to ensure LUT\nis always available. This enables RSS configuration via ethtool before\nbringing the interface up. Simplify LUT management by maintaining all\nchanges in the driver\u0027s soft copy and programming zeros to the indirection\ntable when rxhash is disabled. Defer HW programming until the interface\ncomes up if it is down during rxhash and LUT configuration changes.\n\nSteps to reproduce:\n** Load idpf driver; interfaces will be created\n\tmodprobe idpf\n** Before bringing the interfaces up, turn rxhash off\n\tethtool -K eth2 rxhash off\n\n[89408.371875] BUG: kernel NULL pointer dereference, address: 0000000000000000\n[89408.371908] #PF: supervisor read access in kernel mode\n[89408.371924] #PF: error_code(0x0000) - not-present page\n[89408.371940] PGD 0 P4D 0\n[89408.371953] Oops: Oops: 0000 [#1] SMP NOPTI\n\u003csnip\u003e\n[89408.372052] RIP: 0010:memcpy_orig+0x16/0x130\n[89408.372310] Call Trace:\n[89408.372317]  \u003cTASK\u003e\n[89408.372326]  ? idpf_set_features+0xfc/0x180 [idpf]\n[89408.372363]  __netdev_update_features+0x295/0xde0\n[89408.372384]  ethnl_set_features+0x15e/0x460\n[89408.372406]  genl_family_rcv_msg_doit+0x11f/0x180\n[89408.372429]  genl_rcv_msg+0x1ad/0x2b0\n[89408.372446]  ? __pfx_ethnl_set_features+0x10/0x10\n[89408.372465]  ? __pfx_genl_rcv_msg+0x10/0x10\n[89408.372482]  netlink_rcv_skb+0x58/0x100\n[89408.372502]  genl_rcv+0x2c/0x50\n[89408.372516]  netlink_unicast+0x289/0x3e0\n[89408.372533]  netlink_sendmsg+0x215/0x440\n[89408.372551]  __sys_sendto+0x234/0x240\n[89408.372571]  __x64_sys_sendto+0x28/0x30\n[89408.372585]  x64_sys_call+0x1909/0x1da0\n[89408.372604]  do_syscall_64+0x7a/0xfa0\n[89408.373140]  ? clear_bhb_loop+0x60/0xb0\n[89408.373647]  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[89408.378887]  \u003c/TASK\u003e\n\u003csnip\u003e"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nidpf: Correcci\u00f3n de fallo de puntero NULL de la RSS LUT en operaciones tempranas de ethtool\n\nLa RSS LUT no se inicializa hasta que la interfaz se activa, causando el siguiente fallo de puntero NULL cuando se realizan operaciones de ethtool como rxhash on/off antes de que la interfaz se active por primera vez.\n\nMover la inicializaci\u00f3n de la RSS LUT de ndo_open a la creaci\u00f3n de vport para asegurar que la LUT est\u00e9 siempre disponible. Esto permite la configuraci\u00f3n de RSS a trav\u00e9s de ethtool antes de activar la interfaz. Simplificar la gesti\u00f3n de la LUT manteniendo todos los cambios en la copia blanda del controlador y programando ceros en la tabla de indirecci\u00f3n cuando rxhash est\u00e1 deshabilitado. Aplazar la programaci\u00f3n de HW hasta que la interfaz se active si est\u00e1 inactiva durante los cambios de configuraci\u00f3n de rxhash y LUT.\n\nPasos para reproducir:\n Cargar el controlador idpf; se crear\u00e1n las interfaces\n\tmodprobe idpf\n Antes de activar las interfaces, desactivar rxhash\n\tethtool -K eth2 rxhash off\n\n[89408.371875] BUG: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000000\n[89408.371908] #PF: acceso de lectura de supervisor en modo kernel\n[89408.371924] #PF: error_code(0x0000) - p\u00e1gina no presente\n[89408.371940] PGD 0 P4D 0\n[89408.371953] Oops: Oops: 0000 [#1] SMP NOPTI\n\n[89408.372052] RIP: 0010:memcpy_orig+0x16/0x130\n[89408.372310] Traza de Llamada:\n[89408.372317] \n[89408.372326] ? idpf_set_features+0xfc/0x180 [idpf]\n[89408.372363] __netdev_update_features+0x295/0xde0\n[89408.372384] ethnl_set_features+0x15e/0x460\n[89408.372406] genl_family_rcv_msg_doit+0x11f/0x180\n[89408.372429] genl_rcv_msg+0x1ad/0x2b0\n[89408.372446] ? __pfx_ethnl_set_features+0x10/0x10\n[89408.372465] ? __pfx_genl_rcv_msg+0x10/0x10\n[89408.372482] netlink_rcv_skb+0x58/0x100\n[89408.372502] genl_rcv+0x2c/0x50\n[89408.372516] netlink_unicast+0x289/0x3e0\n[89408.372533] netlink_sendmsg+0x215/0x440\n[89408.372551] __sys_sendto+0x234/0x240\n[89408.372571] __x64_sys_sendto+0x28/0x30\n[89408.372585] x64_sys_call+0x1909/0x1da0\n[89408.372604] do_syscall_64+0x7a/0xfa0\n[89408.373140] ? clear_bhb_loop+0x60/0xb0\n[89408.373647] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[89408.378887] \n"
    }
  ],
  "id": "CVE-2026-22985",
  "lastModified": "2026-04-02T12:16:18.973",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-01-23T16:15:54.553",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/83f38f210b85676f40ba8586b5a8edae19b56995"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/b29a5a7dd1f4293ee49c469938c25bf85a5aa802"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/df2790b5228fbd3ed415b70a231cffdad0431618"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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