FKIE_CVE-2025-38513

Vulnerability from fkie_nvd - Published: 2025-08-16 11:15 - Updated: 2026-01-07 17:47
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: wifi: zd1211rw: Fix potential NULL pointer dereference in zd_mac_tx_to_dev() There is a potential NULL pointer dereference in zd_mac_tx_to_dev(). For example, the following is possible: T0 T1 zd_mac_tx_to_dev() /* len == skb_queue_len(q) */ while (len > ZD_MAC_MAX_ACK_WAITERS) { filter_ack() spin_lock_irqsave(&q->lock, flags); /* position == skb_queue_len(q) */ for (i=1; i<position; i++) skb = __skb_dequeue(q) if (mac->type == NL80211_IFTYPE_AP) skb = __skb_dequeue(q); spin_unlock_irqrestore(&q->lock, flags); skb_dequeue() -> NULL Since there is a small gap between checking skb queue length and skb being unconditionally dequeued in zd_mac_tx_to_dev(), skb_dequeue() can return NULL. Then the pointer is passed to zd_mac_tx_status() where it is dereferenced. In order to avoid potential NULL pointer dereference due to situations like above, check if skb is not NULL before passing it to zd_mac_tx_status(). Found by Linux Verification Center (linuxtesting.org) with SVACE.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/014c34dc132015c4f918ada4982e952947ac1047Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5420de65efbeb6503bcf1d43451c9df67ad60298Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/602b4eb2f25668de15de69860ec99caf65b3684dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/74b1ec9f5d627d2bdd5e5b6f3f81c23317657023Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/adf08c96b963c7cd7ec1ee1c0c556228d9bedaaePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b24f65c184540dfb967479320ecf7e8c2e9220dcPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c1958270de947604cc6de05fc96dbba256b49cf0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fcd9c923b58e86501450b9b442ccc7ce4a8d0fdaPatch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00007.htmlThird Party Advisory, Mailing List
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlThird Party Advisory, Mailing List
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
linux linux_kernel 6.16
debian debian_linux 11.0
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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: zd1211rw: Fix potential NULL pointer dereference in zd_mac_tx_to_dev()\n\nThere is a potential NULL pointer dereference in zd_mac_tx_to_dev(). For\nexample, the following is possible:\n\n    \tT0\t\t\t    \t\tT1\nzd_mac_tx_to_dev()\n  /* len == skb_queue_len(q) */\n  while (len \u003e ZD_MAC_MAX_ACK_WAITERS) {\n\n\t\t\t\t\t  filter_ack()\n\t\t\t\t\t    spin_lock_irqsave(\u0026q-\u003elock, flags);\n\t\t\t\t\t    /* position == skb_queue_len(q) */\n\t\t\t\t\t    for (i=1; i\u003cposition; i++)\n\t\t\t\t    \t      skb = __skb_dequeue(q)\n\n\t\t\t\t\t    if (mac-\u003etype == NL80211_IFTYPE_AP)\n\t\t\t\t\t      skb = __skb_dequeue(q);\n\t\t\t\t\t    spin_unlock_irqrestore(\u0026q-\u003elock, flags);\n\n    skb_dequeue() -\u003e NULL\n\nSince there is a small gap between checking skb queue length and skb being\nunconditionally dequeued in zd_mac_tx_to_dev(), skb_dequeue() can return NULL.\nThen the pointer is passed to zd_mac_tx_status() where it is dereferenced.\n\nIn order to avoid potential NULL pointer dereference due to situations like\nabove, check if skb is not NULL before passing it to zd_mac_tx_status().\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: wifi: zd1211rw: Se corrige una posible desreferencia de puntero NULL en zd_mac_tx_to_dev(). Existe una posible desreferencia de puntero NULL en zd_mac_tx_to_dev(). Por ejemplo, es posible lo siguiente: T0 T1 zd_mac_tx_to_dev() /* len == skb_queue_len(q) */ while (len \u0026gt; ZD_MAC_MAX_ACK_WAITERS) { filter_ack() spin_lock_irqsave(\u0026amp;q-\u0026gt;lock, flags); /* position == skb_queue_len(q) */ for (i=1; itype == NL80211_IFTYPE_AP) skb = __skb_dequeue(q); spin_unlock_irqrestore(\u0026amp;q-\u0026gt;lock, flags); skb_dequeue() -\u0026gt; NULL. Dado que hay una peque\u00f1a diferencia entre la comprobaci\u00f3n de la longitud de la cola de skb y su desencolado incondicional en zd_mac_tx_to_dev(), skb_dequeue() puede devolver NULL. A continuaci\u00f3n, el puntero se pasa a zd_mac_tx_status(), donde se desreferencia. Para evitar posibles desreferencias de punteros NULL debido a situaciones como la anterior, compruebe que skb no sea NULL antes de pasarlo a zd_mac_tx_status(). Encontrado por el Centro de Verificaci\u00f3n de Linux (linuxtesting.org) con SVACE."
    }
  ],
  "id": "CVE-2025-38513",
  "lastModified": "2026-01-07T17:47:21.377",
  "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"
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        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2025-08-16T11:15:44.383",
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  "vulnStatus": "Analyzed",
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          "value": "CWE-476"
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      "source": "nvd@nist.gov",
      "type": "Primary"
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}


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Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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