CVE-2025-38513 (GCVE-0-2025-38513)
Vulnerability from cvelistv5 – Published: 2025-08-16 10:55 – Updated: 2026-05-11 21:29
VLAI
EPSS
VEX
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
5.5 (Medium)
Assigner
References
10 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| 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) |
guessed | |
| 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) |
guessed |
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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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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/wireless/zydas/zd1211rw/zd_mac.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"459c51ad6e1fc19e91a53798358433d3c08cd09d\",\"lessThan\":\"c1958270de947604cc6de05fc96dbba256b49cf0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"459c51ad6e1fc19e91a53798358433d3c08cd09d\",\"lessThan\":\"014c34dc132015c4f918ada4982e952947ac1047\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"459c51ad6e1fc19e91a53798358433d3c08cd09d\",\"lessThan\":\"b24f65c184540dfb967479320ecf7e8c2e9220dc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"459c51ad6e1fc19e91a53798358433d3c08cd09d\",\"lessThan\":\"adf08c96b963c7cd7ec1ee1c0c556228d9bedaae\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"459c51ad6e1fc19e91a53798358433d3c08cd09d\",\"lessThan\":\"5420de65efbeb6503bcf1d43451c9df67ad60298\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"459c51ad6e1fc19e91a53798358433d3c08cd09d\",\"lessThan\":\"fcd9c923b58e86501450b9b442ccc7ce4a8d0fda\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"459c51ad6e1fc19e91a53798358433d3c08cd09d\",\"lessThan\":\"602b4eb2f25668de15de69860ec99caf65b3684d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"459c51ad6e1fc19e91a53798358433d3c08cd09d\",\"lessThan\":\"74b1ec9f5d627d2bdd5e5b6f3f81c23317657023\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/wireless/zydas/zd1211rw/zd_mac.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.25\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.25\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.296\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.240\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.189\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.146\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.99\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.39\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15.7\",\"lessThanOrEqual\":\"6.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.16\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.25\",\"versionEndExcluding\":\"5.4.296\",\"matchCriteriaId\":\"CA542DE1-DC35-467A-9B59-749FAD581273\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.240\",\"matchCriteriaId\":\"0E73A49A-F9B2-470F-91B2-6FAB6239BDB6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.189\",\"matchCriteriaId\":\"3CE0FB9A-DBE8-48B6-BF6E-3C724A4991E3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.146\",\"matchCriteriaId\":\"D8DA1166-5C95-475E-BF65-1DF621968E96\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.99\",\"matchCriteriaId\":\"B369699C-E0E6-42A4-BDEE-8E676ECEF6AA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.39\",\"matchCriteriaId\":\"18D57670-11F8-4B5A-AD56-EA32DD0F44E1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux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List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]}]}}",
"redhat_vex": {
"aggregate_severity": "None",
"current_release_date": "2026-06-30T10:19:07+00:00",
"cve": "CVE-2025-38513",
"id": "CVE-2025-38513",
"initial_release_date": "2025-08-16T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: wifi: zd1211rw: Fix potential NULL pointer dereference in zd_mac_tx_to_dev()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38513.json",
"version": "3"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- 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.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- 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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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