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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\neth: bnxt: always recalculate features after XDP clearing, fix null-deref\n\nRecalculate features when XDP is detached.\n\nBefore:\n  # ip li set dev eth0 xdp obj xdp_dummy.bpf.o sec xdp\n  # ip li set dev eth0 xdp off\n  # ethtool -k eth0 | grep gro\n  rx-gro-hw: off [requested on]\n\nAfter:\n  # ip li set dev eth0 xdp obj xdp_dummy.bpf.o sec xdp\n  # ip li set dev eth0 xdp off\n  # ethtool -k eth0 | grep gro\n  rx-gro-hw: on\n\nThe fact that HW-GRO doesn\u0027t get re-enabled automatically is just\na minor annoyance. The real issue is that the features will randomly\ncome back during another reconfiguration which just happens to invoke\nnetdev_update_features(). The driver doesn\u0027t handle reconfiguring\ntwo things at a time very robustly.\n\nStarting with commit 98ba1d931f61 (\"bnxt_en: Fix RSS logic in\n__bnxt_reserve_rings()\") we only reconfigure the RSS hash table\nif the \"effective\" number of Rx rings has changed. If HW-GRO is\nenabled \"effective\" number of rings is 2x what user sees.\nSo if we are in the bad state, with HW-GRO re-enablement \"pending\"\nafter XDP off, and we lower the rings by / 2 - the HW-GRO rings\ndoing 2x and the ethtool -L doing / 2 may cancel each other out,\nand the:\n\n  if (old_rx_rings != bp-\u003ehw_resc.resv_rx_rings \u0026\u0026\n\ncondition in __bnxt_reserve_rings() will be false.\nThe RSS map won\u0027t get updated, and we\u0027ll crash with:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000168\n  RIP: 0010:__bnxt_hwrm_vnic_set_rss+0x13a/0x1a0\n    bnxt_hwrm_vnic_rss_cfg_p5+0x47/0x180\n    __bnxt_setup_vnic_p5+0x58/0x110\n    bnxt_init_nic+0xb72/0xf50\n    __bnxt_open_nic+0x40d/0xab0\n    bnxt_open_nic+0x2b/0x60\n    ethtool_set_channels+0x18c/0x1d0\n\nAs we try to access a freed ring.\n\nThe issue is present since XDP support was added, really, but\nprior to commit 98ba1d931f61 (\"bnxt_en: Fix RSS logic in\n__bnxt_reserve_rings()\") it wasn\u0027t causing major issues."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: eth: bnxt: siempre recalcula las caracter\u00edsticas despu\u00e9s de borrar XDP, corrige null-deref Recalcula las caracter\u00edsticas cuando se desconecta XDP. Antes: # ip li set dev eth0 xdp obj xdp_dummy.bpf.o sec xdp # ip li set dev eth0 xdp off # ethtool -k eth0 | grep gro rx-gro-hw: off [solicitado el] Despu\u00e9s: # ip li set dev eth0 xdp obj xdp_dummy.bpf.o sec xdp # ip li set dev eth0 xdp off # ethtool -k eth0 | grep gro rx-gro-hw: on El hecho de que HW-GRO no se vuelva a habilitar autom\u00e1ticamente es solo una molestia menor. El problema real es que las funciones volver\u00e1n de forma aleatoria durante otra reconfiguraci\u00f3n que invoca netdev_update_features(). El controlador no gestiona la reconfiguraci\u00f3n de dos cosas a la vez de forma muy robusta. A partir de el commit 98ba1d931f61 (\"bnxt_en: Fix RSS logic in __bnxt_reserve_rings()\"), solo reconfiguramos la tabla hash RSS si el n\u00famero \"efectivo\" de anillos Rx ha cambiado. Si HW-GRO est\u00e1 habilitado, el n\u00famero \"efectivo\" de anillos es el doble de lo que ve el usuario. Entonces, si estamos en un mal estado, con la rehabilitaci\u00f3n de HW-GRO \"pendiente\" despu\u00e9s de desactivar XDP, y reducimos los anillos en / 2, los anillos de HW-GRO haciendo 2x y ethtool -L haciendo / 2 pueden cancelarse entre s\u00ed, y la condici\u00f3n: if (old_rx_rings != bp-\u0026gt;hw_resc.resv_rx_rings \u0026amp;\u0026amp; en __bnxt_reserve_rings() ser\u00e1 falsa. El mapa RSS no se actualizar\u00e1 y nos bloquearemos con: ERROR: desreferencia de puntero NULL del kernel, direcci\u00f3n: 0000000000000168 RIP: 0010:__bnxt_hwrm_vnic_set_rss+0x13a/0x1a0 bnxt_hwrm_vnic_rss_cfg_p5+0x47/0x180 __bnxt_setup_vnic_p5+0x58/0x110 bnxt_init_nic+0xb72/0xf50 __bnxt_open_nic+0x40d/0xab0 bnxt_open_nic+0x2b/0x60 ethtool_set_channels+0x18c/0x1d0 Cuando intentamos acceder a un anillo liberado, el problema est\u00e1 presente desde que se agreg\u00f3 la compatibilidad con XDP, pero antes de el commit 98ba1d931f61 (\"bnxt_en: Fix RSS logic in __bnxt_reserve_rings()\") no causaba problemas importantes."
    }
  ],
  "id": "CVE-2025-21682",
  "lastModified": "2025-02-04T15:25:48.707",
  "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"
      }
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  "published": "2025-01-31T12:15:29.363",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/08831a894d18abfaabb5bbde7c2069a7fb41dd93"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
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}