CVE-2025-38513 (GCVE-0-2025-38513)

Vulnerability from cvelistv5 – Published: 2025-08-16 10:55 – Updated: 2025-11-03 17:39
VLAI?
Title
wifi: zd1211rw: Fix potential NULL pointer dereference in zd_mac_tx_to_dev()
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 459c51ad6e1fc19e91a53798358433d3c08cd09d , < c1958270de947604cc6de05fc96dbba256b49cf0 (git)
Affected: 459c51ad6e1fc19e91a53798358433d3c08cd09d , < 014c34dc132015c4f918ada4982e952947ac1047 (git)
Affected: 459c51ad6e1fc19e91a53798358433d3c08cd09d , < b24f65c184540dfb967479320ecf7e8c2e9220dc (git)
Affected: 459c51ad6e1fc19e91a53798358433d3c08cd09d , < adf08c96b963c7cd7ec1ee1c0c556228d9bedaae (git)
Affected: 459c51ad6e1fc19e91a53798358433d3c08cd09d , < 5420de65efbeb6503bcf1d43451c9df67ad60298 (git)
Affected: 459c51ad6e1fc19e91a53798358433d3c08cd09d , < fcd9c923b58e86501450b9b442ccc7ce4a8d0fda (git)
Affected: 459c51ad6e1fc19e91a53798358433d3c08cd09d , < 602b4eb2f25668de15de69860ec99caf65b3684d (git)
Affected: 459c51ad6e1fc19e91a53798358433d3c08cd09d , < 74b1ec9f5d627d2bdd5e5b6f3f81c23317657023 (git)
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    Linux Linux Affected: 2.6.25
Unaffected: 0 , < 2.6.25 (semver)
Unaffected: 5.4.296 , ≤ 5.4.* (semver)
Unaffected: 5.10.240 , ≤ 5.10.* (semver)
Unaffected: 5.15.189 , ≤ 5.15.* (semver)
Unaffected: 6.1.146 , ≤ 6.1.* (semver)
Unaffected: 6.6.99 , ≤ 6.6.* (semver)
Unaffected: 6.12.39 , ≤ 6.12.* (semver)
Unaffected: 6.15.7 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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          "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."
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      "title": "wifi: zd1211rw: Fix potential NULL pointer dereference in zd_mac_tx_to_dev()",
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