fkie_cve-2025-38513
Vulnerability from fkie_nvd
Published
2025-08-16 11:15
Modified
2025-08-16 11:15
Severity ?
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/014c34dc132015c4f918ada4982e952947ac1047
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5420de65efbeb6503bcf1d43451c9df67ad60298
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/602b4eb2f25668de15de69860ec99caf65b3684d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/74b1ec9f5d627d2bdd5e5b6f3f81c23317657023
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/adf08c96b963c7cd7ec1ee1c0c556228d9bedaae
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b24f65c184540dfb967479320ecf7e8c2e9220dc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c1958270de947604cc6de05fc96dbba256b49cf0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fcd9c923b58e86501450b9b442ccc7ce4a8d0fda
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2025-38513",
  "lastModified": "2025-08-16T11:15:44.383",
  "metrics": {},
  "published": "2025-08-16T11:15:44.383",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/014c34dc132015c4f918ada4982e952947ac1047"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5420de65efbeb6503bcf1d43451c9df67ad60298"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/602b4eb2f25668de15de69860ec99caf65b3684d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/74b1ec9f5d627d2bdd5e5b6f3f81c23317657023"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/adf08c96b963c7cd7ec1ee1c0c556228d9bedaae"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b24f65c184540dfb967479320ecf7e8c2e9220dc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c1958270de947604cc6de05fc96dbba256b49cf0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fcd9c923b58e86501450b9b442ccc7ce4a8d0fda"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.