CVE-2025-38513 (GCVE-0-2025-38513)
Vulnerability from cvelistv5
Published
2025-08-16 10:55
Modified
2025-08-16 10:55
Severity ?
VLAI Severity ?
EPSS score ?
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
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| ► | Linux | Linux |
Version: 459c51ad6e1fc19e91a53798358433d3c08cd09d Version: 459c51ad6e1fc19e91a53798358433d3c08cd09d Version: 459c51ad6e1fc19e91a53798358433d3c08cd09d Version: 459c51ad6e1fc19e91a53798358433d3c08cd09d Version: 459c51ad6e1fc19e91a53798358433d3c08cd09d Version: 459c51ad6e1fc19e91a53798358433d3c08cd09d Version: 459c51ad6e1fc19e91a53798358433d3c08cd09d Version: 459c51ad6e1fc19e91a53798358433d3c08cd09d |
|
{
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"programFiles": [
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],
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"vendor": "Linux",
"versions": [
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"version": "2.6.25"
},
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"status": "unaffected",
"version": "0",
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},
{
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},
{
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"version": "5.10.240",
"versionType": "semver"
},
{
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"version": "5.15.189",
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},
{
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"status": "unaffected",
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"version": "6.6.99",
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{
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"versionType": "original_commit_for_fix"
}
]
}
],
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"negate": false,
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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."
}
],
"providerMetadata": {
"dateUpdated": "2025-08-16T10:55:00.254Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/c1958270de947604cc6de05fc96dbba256b49cf0"
},
{
"url": "https://git.kernel.org/stable/c/014c34dc132015c4f918ada4982e952947ac1047"
},
{
"url": "https://git.kernel.org/stable/c/b24f65c184540dfb967479320ecf7e8c2e9220dc"
},
{
"url": "https://git.kernel.org/stable/c/adf08c96b963c7cd7ec1ee1c0c556228d9bedaae"
},
{
"url": "https://git.kernel.org/stable/c/5420de65efbeb6503bcf1d43451c9df67ad60298"
},
{
"url": "https://git.kernel.org/stable/c/fcd9c923b58e86501450b9b442ccc7ce4a8d0fda"
},
{
"url": "https://git.kernel.org/stable/c/602b4eb2f25668de15de69860ec99caf65b3684d"
},
{
"url": "https://git.kernel.org/stable/c/74b1ec9f5d627d2bdd5e5b6f3f81c23317657023"
}
],
"title": "wifi: zd1211rw: Fix potential NULL pointer dereference in zd_mac_tx_to_dev()",
"x_generator": {
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}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-38513",
"datePublished": "2025-08-16T10:55:00.254Z",
"dateReserved": "2025-04-16T04:51:24.023Z",
"dateUpdated": "2025-08-16T10:55:00.254Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2025-38513\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-16T11:15:44.383\",\"lastModified\":\"2025-08-16T11:15:44.383\",\"vulnStatus\":\"Received\",\"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.\"}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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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.
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