CVE-2025-38646

Estado: AnalizadaMedia (5.5)—

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

wifi: rtw89: avoid NULL dereference when RX problematic packet on unsupported 6 GHz band

With a quite rare chance, RX report might be problematic to make SW think a packet is received on 6 GHz band even if the chip does not support 6 GHz band actually. Since SW won't initialize stuffs for unsupported bands, NULL dereference will happen then in the sequence, rtw89_vif_rx_stats_iter() -> rtw89_core_cancel_6ghz_probe_tx(). So, add a check to avoid it.

The following is a crash log for this case.

Detalles técnicos trazas, registros y código del informe original

 BUG: kernel NULL pointer dereference, address: 0000000000000032
 #PF: supervisor read access in kernel mode
 #PF: error_code(0x0000) - not-present page
 PGD 0 P4D 0
 Oops: 0000 [#1] PREEMPT SMP NOPTI
 CPU: 1 PID: 1907 Comm: irq/131-rtw89_p Tainted: G     U             6.6.56-05896-g89f5fb0eb30b #1 (HASH:1400 4)
 Hardware name: Google Telith/Telith, BIOS Google_Telith.15217.747.0 11/12/2024
 RIP: 0010:rtw89_vif_rx_stats_iter+0xd2/0x310 [rtw89_core]
 Code: 4c 89 7d c8 48 89 55 c0 49 8d 44 24 02 48 89 45 b8 45 31 ff eb 11
 41 c6 45 3a 01 41 b7 01 4d 8b 6d 00 4d 39 f5 74 42 8b 43 10 <41> 33 45
 32 0f b7 4b 14 66 41 33 4d 36 0f b7 c9 09 c1 74 d8 4d 85
 RSP: 0018:ffff9f3080138ca0 EFLAGS: 00010246
 RAX: 00000000b8bf5770 RBX: ffff91b5e8c639c0 RCX: 0000000000000011
 RDX: ffff91b582de1be8 RSI: 0000000000000000 RDI: ffff91b5e8c639e6
 RBP: ffff9f3080138d00 R08: 0000000000000000 R09: 0000000000000000
 R10: ffff91b59de70000 R11: ffffffffc069be50 R12: ffff91b5e8c639e4
 R13: 0000000000000000 R14: ffff91b5828020b8 R15: 0000000000000000
 FS:  0000000000000000(0000) GS:ffff91b8efa40000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 0000000000000032 CR3: 00000002bf838000 CR4: 0000000000750ee0
 PKRU: 55555554
 Call Trace:
  <IRQ>
  ? __die_body+0x68/0xb0
  ? page_fault_oops+0x379/0x3e0
  ? exc_page_fault+0x4f/0xa0
  ? asm_exc_page_fault+0x22/0x30
  ? __pfx_rtw89_vif_rx_stats_iter+0x10/0x10 [rtw89_core (HASH:1400 5)]
  ? rtw89_vif_rx_stats_iter+0xd2/0x310 [rtw89_core (HASH:1400 5)]
  __iterate_interfaces+0x59/0x110 [mac80211 (HASH:1400 6)]
  ? __pfx_rtw89_vif_rx_stats_iter+0x10/0x10 [rtw89_core (HASH:1400 5)]
  ? __pfx_rtw89_vif_rx_stats_iter+0x10/0x10 [rtw89_core (HASH:1400 5)]
  ieee80211_iterate_active_interfaces_atomic+0x36/0x50 [mac80211 (HASH:1400 6)]
  rtw89_core_rx_to_mac80211+0xfd/0x1b0 [rtw89_core (HASH:1400 5)]
  rtw89_core_rx+0x43a/0x980 [rtw89_core (HASH:1400 5)]

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 5.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.16%
Percentil entre todas las CVEs puntuadas: 4
Fecha de la puntuación: 5/10/2026

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

CWE-476

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2025-38646",
  "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": "c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0",
              "lessThan": "892b29eab44b1803d2cad8e50f1bc2144ef478cb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0",
              "lessThan": "77a7a48f87d673a68664bebf044214821decbfda",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0",
              "lessThan": "f3527ac15a00916e68ecb495b74dbe6a6c62a06f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0",
              "lessThan": "4b525630729082f026e7030eafccf89e3add7eae",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c6aa9a9c47252ac7b07ed6d10459027e2f2a2de0",
              "lessThan": "7e04f01bb94fe61c73cc59f0495c3b6c16a83231",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/net/wireless/realtek/rtw89/core.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.4",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.102",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.42",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.15.10",
              "versionType": "semver",
              "lessThanOrEqual": "6.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.16.1",
              "versionType": "semver",
              "lessThanOrEqual": "6.16.*"
            },
            {
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/net/wireless/realtek/rtw89/core.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-08-22T16:15:38.870",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/4b525630729082f026e7030eafccf89e3add7eae",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/77a7a48f87d673a68664bebf044214821decbfda",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7e04f01bb94fe61c73cc59f0495c3b6c16a83231",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/892b29eab44b1803d2cad8e50f1bc2144ef478cb",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f3527ac15a00916e68ecb495b74dbe6a6c62a06f",
      "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\nwifi: rtw89: avoid NULL dereference when RX problematic packet on unsupported 6 GHz band\n\nWith a quite rare chance, RX report might be problematic to make SW think\na packet is received on 6 GHz band even if the chip does not support 6 GHz\nband actually. Since SW won't initialize stuffs for unsupported bands, NULL\ndereference will happen then in the sequence, rtw89_vif_rx_stats_iter() ->\nrtw89_core_cancel_6ghz_probe_tx(). So, add a check to avoid it.\n\nThe following is a crash log for this case.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000032\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: 0000 [#1] PREEMPT SMP NOPTI\n CPU: 1 PID: 1907 Comm: irq/131-rtw89_p Tainted: G     U             6.6.56-05896-g89f5fb0eb30b #1 (HASH:1400 4)\n Hardware name: Google Telith/Telith, BIOS Google_Telith.15217.747.0 11/12/2024\n RIP: 0010:rtw89_vif_rx_stats_iter+0xd2/0x310 [rtw89_core]\n Code: 4c 89 7d c8 48 89 55 c0 49 8d 44 24 02 48 89 45 b8 45 31 ff eb 11\n 41 c6 45 3a 01 41 b7 01 4d 8b 6d 00 4d 39 f5 74 42 8b 43 10 <41> 33 45\n 32 0f b7 4b 14 66 41 33 4d 36 0f b7 c9 09 c1 74 d8 4d 85\n RSP: 0018:ffff9f3080138ca0 EFLAGS: 00010246\n RAX: 00000000b8bf5770 RBX: ffff91b5e8c639c0 RCX: 0000000000000011\n RDX: ffff91b582de1be8 RSI: 0000000000000000 RDI: ffff91b5e8c639e6\n RBP: ffff9f3080138d00 R08: 0000000000000000 R09: 0000000000000000\n R10: ffff91b59de70000 R11: ffffffffc069be50 R12: ffff91b5e8c639e4\n R13: 0000000000000000 R14: ffff91b5828020b8 R15: 0000000000000000\n FS:  0000000000000000(0000) GS:ffff91b8efa40000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000032 CR3: 00000002bf838000 CR4: 0000000000750ee0\n PKRU: 55555554\n Call Trace:\n  <IRQ>\n  ? __die_body+0x68/0xb0\n  ? page_fault_oops+0x379/0x3e0\n  ? exc_page_fault+0x4f/0xa0\n  ? asm_exc_page_fault+0x22/0x30\n  ? __pfx_rtw89_vif_rx_stats_iter+0x10/0x10 [rtw89_core (HASH:1400 5)]\n  ? rtw89_vif_rx_stats_iter+0xd2/0x310 [rtw89_core (HASH:1400 5)]\n  __iterate_interfaces+0x59/0x110 [mac80211 (HASH:1400 6)]\n  ? __pfx_rtw89_vif_rx_stats_iter+0x10/0x10 [rtw89_core (HASH:1400 5)]\n  ? __pfx_rtw89_vif_rx_stats_iter+0x10/0x10 [rtw89_core (HASH:1400 5)]\n  ieee80211_iterate_active_interfaces_atomic+0x36/0x50 [mac80211 (HASH:1400 6)]\n  rtw89_core_rx_to_mac80211+0xfd/0x1b0 [rtw89_core (HASH:1400 5)]\n  rtw89_core_rx+0x43a/0x980 [rtw89_core (HASH:1400 5)]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: wifi: rtw89: evitar la desreferencia NULL al recibir un paquete problemático en una banda de 6 GHz no compatible. En raras ocasiones, el informe de recepción podría ser problemático al hacer que el software piense que se recibe un paquete en la banda de 6 GHz, incluso si el chip no la admite. Dado que el software no inicializa elementos para bandas no compatibles, se producirá una desreferencia NULL en la secuencia rtw89_vif_rx_stats_iter() -&gt; rtw89_core_cancel_6ghz_probe_tx(). Por lo tanto, se debe añadir una comprobación para evitarlo. A continuación, se muestra un registro de fallos para este caso. ERROR: desreferencia de puntero NULL del kernel, dirección: 0000000000000032 #PF: acceso de lectura del supervisor en modo kernel #PF: error_code(0x0000) - página no presente PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 1 PID: 1907 Comm: irq/131-rtw89_p Tainted: GU 6.6.56-05896-g89f5fb0eb30b #1 (HASH:1400 4) Nombre del hardware: Google Telith/Telith, BIOS Google_Telith.15217.747.0 11/12/2024 RIP: 0010:rtw89_vif_rx_stats_iter+0xd2/0x310 [rtw89_core] Código: 4c 89 7d c8 48 89 55 c0 49 8d 44 24 02 48 89 45 b8 45 31 ff eb 11 41 c6 45 3a 01 41 b7 01 4d 8b 6d 00 4d 39 f5 74 42 8b 43 10 &lt;41&gt; 33 45 32 0f b7 4b 14 66 41 33 4d 36 0f b7 c9 09 c1 74 d8 4d 85 RSP: 0018:ffff9f3080138ca0 EFLAGS: 00010246 RAX: 00000000b8bf5770RBX: ffff91b5e8c639c0 RCX: 00000000000000011 RDX: ffff91b582de1be8 RSI: 0000000000000000 RDI: ffff91b5e8c639e6 RBP: ffff9f3080138d00 R08: 0000000000000000 R09: 00000000000000000 R10: ffff91b59de70000 R11: ffffffffc069be50 R12: ffff91b5e8c639e4 R13: 0000000000000000 R14: ffff91b5828020b8 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff91b8efa40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000000032 CR3: 00000002bf838000 CR4: 0000000000750ee0 PKRU: 55555554 Rastreo de llamadas:  ? __die_body+0x68/0xb0 ? error_página_oops+0x379/0x3e0 ? error_página_oops+0x4f/0xa0 ? error_página_oops+0x22/0x30 ? __pfx_rtw89_vif_rx_stats_iter+0x10/0x10 [núcleo_rtw89 (HASH:1400 5)] ? rtw89_vif_rx_stats_iter+0xd2/0x310 [núcleo_rtw89 (HASH:1400 5)] __iterate_interfaces+0x59/0x110 [mac80211 (HASH:1400 6)] ? __pfx_rtw89_vif_rx_stats_iter+0x10/0x10 [núcleo rtw89 (HASH:1400 5)] ? __pfx_rtw89_vif_rx_stats_iter+0x10/0x10 [núcleo rtw89 (HASH:1400 5)] ieee80211_iterar_interfaces_activas_atómicas+0x36/0x50 [mac80211 (HASH:1400 6)] rtw89_núcleo_rx_a_mac80211+0xfd/0x1b0 [núcleo rtw89 (HASH:1400 5)] rtw89_núcleo_rx+0x43a/0x980 [núcleo rtw89 (HASH:1400 5)]"
    }
  ],
  "lastModified": "2026-06-17T09:17:17.753",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5BCA0ECA-F7A2-42B6-A438-0891D46073AD",
              "versionEndExcluding": "6.6.102",
              "versionStartIncluding": "6.4"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "EA7AA5E6-4376-4A85-A021-6ACC5FF801C3",
              "versionEndExcluding": "6.12.42",
              "versionStartIncluding": "6.7"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5890C690-B295-40C2-9121-FF5F987E5142",
              "versionEndExcluding": "6.15.10",
              "versionStartIncluding": "6.13"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "58182352-D7DF-4CC9-841E-03C1D852C3FB",
              "versionEndExcluding": "6.16.1",
              "versionStartIncluding": "6.16"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}