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CVE-2025-21973

Estado: AnalizadaAlta (7.1)—

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

When qstats-get operation is executed, callbacks of netdev_stats_ops are called. The bnxt_get_queue_stats{rx | tx} collect per-queue stats from sw_stats in the rings. But {rx | tx | cp}_ring are allocated when the interface is up. So, these rings are not allocated when the interface is down.

The qstats-get is allowed even if the interface is down. However, the bnxt_get_queue_stats{rx | tx}() accesses cp_ring and tx_ring without null check. So, it needs to avoid accessing rings if the interface is down.

Reproducer: ip link set $interface down ./cli.py --spec netdev.yaml --dump qstats-get OR ip link set $interface down python ./stats.py

Detalles técnicos trazas, registros y código del informe original
eth: bnxt: fix kernel panic in the bnxt_get_queue_stats{rx | tx}

Splat looks like:
 BUG: kernel NULL pointer dereference, address: 0000000000000000
 #PF: supervisor read access in kernel mode
 #PF: error_code(0x0000) - not-present page
 PGD 1680fa067 P4D 1680fa067 PUD 16be3b067 PMD 0
 Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI
 CPU: 0 UID: 0 PID: 1495 Comm: python3 Not tainted 6.14.0-rc4+ #32 5cd0f999d5a15c574ac72b3e4b907341
 Hardware name: ASUS System Product Name/PRIME Z690-P D4, BIOS 0603 11/01/2021
 RIP: 0010:bnxt_get_queue_stats_rx+0xf/0x70 [bnxt_en]
 Code: c6 87 b5 18 00 00 02 eb a2 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 01
 RSP: 0018:ffffabef43cdb7e0 EFLAGS: 00010282
 RAX: 0000000000000000 RBX: ffffffffc04c8710 RCX: 0000000000000000
 RDX: ffffabef43cdb858 RSI: 0000000000000000 RDI: ffff8d504e850000
 RBP: ffff8d506c9f9c00 R08: 0000000000000004 R09: ffff8d506bcd901c
 R10: 0000000000000015 R11: ffff8d506bcd9000 R12: 0000000000000000
 R13: ffffabef43cdb8c0 R14: ffff8d504e850000 R15: 0000000000000000
 FS:  00007f2c5462b080(0000) GS:ffff8d575f600000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 0000000000000000 CR3: 0000000167fd0000 CR4: 00000000007506f0
 PKRU: 55555554
 Call Trace:
  <TASK>
  ? __die+0x20/0x70
  ? page_fault_oops+0x15a/0x460
  ? sched_balance_find_src_group+0x58d/0xd10
  ? exc_page_fault+0x6e/0x180
  ? asm_exc_page_fault+0x22/0x30
  ? bnxt_get_queue_stats_rx+0xf/0x70 [bnxt_en cdd546fd48563c280cfd30e9647efa420db07bf1]
  netdev_nl_stats_by_netdev+0x2b1/0x4e0
  ? xas_load+0x9/0xb0
  ? xas_find+0x183/0x1d0
  ? xa_find+0x8b/0xe0
  netdev_nl_qstats_get_dumpit+0xbf/0x1e0
  genl_dumpit+0x31/0x90
  netlink_dump+0x1a8/0x360

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Acceso local (AV:L, PR:L) sin interacción permite denegación de servicio mediante NULL pointer dereference al acceder a anillos sin verificación cuando interfaz está down.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramRestrict File and Directory PermissionsRemote Data StorageFilter Network TrafficExecution PreventionEncrypt Sensitive Information

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2025-21973",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.1,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.2,
        "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": "af7b3b4adda592cb49e202f3617454d5dda4c5b5",
              "lessThan": "f059a0fd733078c3832fd0f3a3037aa5975d3d36",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "af7b3b4adda592cb49e202f3617454d5dda4c5b5",
              "lessThan": "adb830085f0fc3a09a0fc8b64fed2e7c8d244665",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "af7b3b4adda592cb49e202f3617454d5dda4c5b5",
              "lessThan": "f09af5fdfbd9b0fcee73aab1116904c53b199e97",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/broadcom/bnxt/bnxt.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.9",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.20",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.13.8",
              "versionType": "semver",
              "lessThanOrEqual": "6.13.*"
            },
            {
              "status": "unaffected",
              "version": "6.14",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/net/ethernet/broadcom/bnxt/bnxt.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-04-01T16:15:28.637",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/adb830085f0fc3a09a0fc8b64fed2e7c8d244665",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f059a0fd733078c3832fd0f3a3037aa5975d3d36",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f09af5fdfbd9b0fcee73aab1116904c53b199e97",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\neth: bnxt: fix kernel panic in the bnxt_get_queue_stats{rx | tx}\n\nWhen qstats-get operation is executed, callbacks of netdev_stats_ops\nare called. The bnxt_get_queue_stats{rx | tx} collect per-queue stats\nfrom sw_stats in the rings.\nBut {rx | tx | cp}_ring are allocated when the interface is up.\nSo, these rings are not allocated when the interface is down.\n\nThe qstats-get is allowed even if the interface is down. However,\nthe bnxt_get_queue_stats{rx | tx}() accesses cp_ring and tx_ring\nwithout null check.\nSo, it needs to avoid accessing rings if the interface is down.\n\nReproducer:\n ip link set $interface down\n ./cli.py --spec netdev.yaml --dump qstats-get\nOR\n ip link set $interface down\n python ./stats.py\n\nSplat looks like:\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 1680fa067 P4D 1680fa067 PUD 16be3b067 PMD 0\n Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI\n CPU: 0 UID: 0 PID: 1495 Comm: python3 Not tainted 6.14.0-rc4+ #32 5cd0f999d5a15c574ac72b3e4b907341\n Hardware name: ASUS System Product Name/PRIME Z690-P D4, BIOS 0603 11/01/2021\n RIP: 0010:bnxt_get_queue_stats_rx+0xf/0x70 [bnxt_en]\n Code: c6 87 b5 18 00 00 02 eb a2 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 01\n RSP: 0018:ffffabef43cdb7e0 EFLAGS: 00010282\n RAX: 0000000000000000 RBX: ffffffffc04c8710 RCX: 0000000000000000\n RDX: ffffabef43cdb858 RSI: 0000000000000000 RDI: ffff8d504e850000\n RBP: ffff8d506c9f9c00 R08: 0000000000000004 R09: ffff8d506bcd901c\n R10: 0000000000000015 R11: ffff8d506bcd9000 R12: 0000000000000000\n R13: ffffabef43cdb8c0 R14: ffff8d504e850000 R15: 0000000000000000\n FS:  00007f2c5462b080(0000) GS:ffff8d575f600000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000000 CR3: 0000000167fd0000 CR4: 00000000007506f0\n PKRU: 55555554\n Call Trace:\n  <TASK>\n  ? __die+0x20/0x70\n  ? page_fault_oops+0x15a/0x460\n  ? sched_balance_find_src_group+0x58d/0xd10\n  ? exc_page_fault+0x6e/0x180\n  ? asm_exc_page_fault+0x22/0x30\n  ? bnxt_get_queue_stats_rx+0xf/0x70 [bnxt_en cdd546fd48563c280cfd30e9647efa420db07bf1]\n  netdev_nl_stats_by_netdev+0x2b1/0x4e0\n  ? xas_load+0x9/0xb0\n  ? xas_find+0x183/0x1d0\n  ? xa_find+0x8b/0xe0\n  netdev_nl_qstats_get_dumpit+0xbf/0x1e0\n  genl_dumpit+0x31/0x90\n  netlink_dump+0x1a8/0x360"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: eth: bnxt: corrige el pánico del kernel en bnxt_get_queue_stats{rx | tx} Cuando se ejecuta la operación qstats-get, se llaman las devoluciones de llamada de netdev_stats_ops. bnxt_get_queue_stats{rx | tx} recopila estadísticas por cola de sw_stats en los anillos. Pero {rx | tx | cp}_ring se asignan cuando la interfaz está activa. Por lo tanto, estos anillos no se asignan cuando la interfaz está inactiva. qstats-get está permitido incluso si la interfaz está inactiva. Sin embargo, bnxt_get_queue_stats{rx | tx}() accede a cp_ring y tx_ring sin comprobación de valores nulos. Por lo tanto, debe evitar acceder a los anillos si la interfaz está inactiva. Reproductor: ip link set $interface down ./cli.py --spec netdev.yaml --dump qstats-get O ip link set $interface down python ./stats.py El problema se parece a esto: ERROR: desreferencia de puntero NULL del kernel, dirección: 0000000000000000 #PF: acceso de lectura del supervisor en modo kernel #PF: error_code(0x0000) - página no presente PGD 1680fa067 P4D 1680fa067 PUD 16be3b067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 0 UID: 0 PID: 1495 Comm: python3 No contaminado 6.14.0-rc4+ #32 5cd0f999d5a15c574ac72b3e4b907341 Nombre del hardware: Nombre del producto del sistema ASUS System Product Name/PRIME Z690-P D4, BIOS 0603 11/01/2021 RIP: 0010:bnxt_get_queue_stats_rx+0xf/0x70 [bnxt_en] Code: c6 87 b5 18 00 00 02 eb a2 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 01 RSP: 0018:ffffabef43cdb7e0 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffffffffc04c8710 RCX: 0000000000000000 RDX: ffffabef43cdb858 RSI: 0000000000000000 RDI: ffff8d504e850000 RBP: ffff8d506c9f9c00 R08: 0000000000000004 R09: ffff8d506bcd901c R10: 0000000000000015 R11: ffff8d506bcd9000 R12: 0000000000000000 R13: ffffabef43cdb8c0 R14: ffff8d504e850000 R15: 0000000000000000 FS: 00007f2c5462b080(0000) GS:ffff8d575f600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000167fd0000 CR4: 00000000007506f0 PKRU: 55555554 Call Trace:  ? __die+0x20/0x70 ? page_fault_oops+0x15a/0x460 ? sched_balance_find_src_group+0x58d/0xd10 ? exc_page_fault+0x6e/0x180 ? asm_exc_page_fault+0x22/0x30 ? bnxt_get_queue_stats_rx+0xf/0x70 [bnxt_en cdd546fd48563c280cfd30e9647efa420db07bf1] netdev_nl_stats_by_netdev+0x2b1/0x4e0 ? xas_load+0x9/0xb0 ? xas_find+0x183/0x1d0 ? xa_find+0x8b/0xe0 netdev_nl_qstats_get_dumpit+0xbf/0x1e0 genl_dumpit+0x31/0x90 netlink_dump+0x1a8/0x360 "
    }
  ],
  "lastModified": "2026-06-17T08:44:44.880",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "513AF679-3B07-4CEA-9304-17045CBED7F0",
              "versionEndExcluding": "6.12.20",
              "versionStartIncluding": "6.9"
            },
            {
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          "operator": "OR"
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}