CVE-2025-38513
Estado: AnalizadaMedia (5.5)—
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:
filter_ack() spin_lock_irqsave(&q->lock, flags); /* position == skb_queue_len(q) */ for (i=1; i<position; i++) skb = __skb_dequeue(q)
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.
Leer descripción completaMostrar menos
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.
Detalles técnicos trazas, registros y código del informe original
T0 T1
zd_mac_tx_to_dev()
/* len == skb_queue_len(q) */
while (len > ZD_MAC_MAX_ACK_WAITERS) {
if (mac->type == NL80211_IFTYPE_AP)
skb = __skb_dequeue(q);
spin_unlock_irqrestore(&q->lock, flags);
skb_dequeue() -> NULLCVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.16%
- Percentil entre todas las CVEs puntuadas: 5
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (2)
CWE
- CWE-476
Referencias
- https://git.kernel.org/stable/c/014c34dc132015c4f918ada4982e952947ac1047
- https://git.kernel.org/stable/c/5420de65efbeb6503bcf1d43451c9df67ad60298
- https://git.kernel.org/stable/c/602b4eb2f25668de15de69860ec99caf65b3684d
- https://git.kernel.org/stable/c/74b1ec9f5d627d2bdd5e5b6f3f81c23317657023
- https://git.kernel.org/stable/c/adf08c96b963c7cd7ec1ee1c0c556228d9bedaae
- https://git.kernel.org/stable/c/b24f65c184540dfb967479320ecf7e8c2e9220dc
- https://git.kernel.org/stable/c/c1958270de947604cc6de05fc96dbba256b49cf0
- https://git.kernel.org/stable/c/fcd9c923b58e86501450b9b442ccc7ce4a8d0fda
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
JSON original (NVD)
Mostrar
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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 > ZD_MAC_MAX_ACK_WAITERS) {\n\n\t\t\t\t\t filter_ack()\n\t\t\t\t\t spin_lock_irqsave(&q->lock, flags);\n\t\t\t\t\t /* position == skb_queue_len(q) */\n\t\t\t\t\t for (i=1; i<position; i++)\n\t\t\t\t \t skb = __skb_dequeue(q)\n\n\t\t\t\t\t if (mac->type == NL80211_IFTYPE_AP)\n\t\t\t\t\t skb = __skb_dequeue(q);\n\t\t\t\t\t spin_unlock_irqrestore(&q->lock, flags);\n\n skb_dequeue() -> 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 > ZD_MAC_MAX_ACK_WAITERS) { filter_ack() spin_lock_irqsave(&q->lock, flags); /* position == skb_queue_len(q) */ for (i=1; itype == NL80211_IFTYPE_AP) skb = __skb_dequeue(q); spin_unlock_irqrestore(&q->lock, flags); skb_dequeue() -> NULL. Dado que hay una pequeña diferencia entre la comprobación de la longitud de la cola de skb y su desencolado incondicional en zd_mac_tx_to_dev(), skb_dequeue() puede devolver NULL. A continuación, 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 Verificación de Linux (linuxtesting.org) con SVACE."
}
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