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CVE-2026-23172

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

net: wwan: t7xx: fix potential skb->frags overflow in RX path

When receiving data in the DPMAIF RX path, the t7xx_dpmaif_set_frag_to_skb() function adds page fragments to an skb without checking if the number of fragments has exceeded MAX_SKB_FRAGS. This could lead to a buffer overflow in skb_shinfo(skb)->frags[] array, corrupting adjacent memory and potentially causing kernel crashes or other undefined behavior.

This issue was identified through static code analysis by comparing with a similar vulnerability fixed in the mt76 driver commit b102f0c522cf ("mt76: fix array overflow on receiving too many fragments for a packet").

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The vulnerability could be triggered if the modem firmware sends packets with excessive fragments. While under normal protocol conditions (MTU 3080 bytes, BAT buffer 3584 bytes), a single packet should not require additional fragments, the kernel should not blindly trust firmware behavior. Malicious, buggy, or compromised firmware could potentially craft packets with more fragments than the kernel expects.

Fix this by adding a bounds check before calling skb_add_rx_frag() to ensure nr_frags does not exceed MAX_SKB_FRAGS.

The check must be performed before unmapping to avoid a page leak and double DMA unmap during device teardown.

CVSS

Probabilidad de explotación (EPSS)

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 (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: wwan: t7xx: fix potential skb->frags overflow in RX path\n\nWhen receiving data in the DPMAIF RX path,\nthe t7xx_dpmaif_set_frag_to_skb() function adds\npage fragments to an skb without checking if the number of\nfragments has exceeded MAX_SKB_FRAGS. This could lead to a buffer overflow\nin skb_shinfo(skb)->frags[] array, corrupting adjacent memory and\npotentially causing kernel crashes or other undefined behavior.\n\nThis issue was identified through static code analysis by comparing with a\nsimilar vulnerability fixed in the mt76 driver commit b102f0c522cf (\"mt76:\nfix array overflow on receiving too many fragments for a packet\").\n\nThe vulnerability could be triggered if the modem firmware sends packets\nwith excessive fragments. While under normal protocol conditions (MTU 3080\nbytes, BAT buffer 3584 bytes),\na single packet should not require additional\nfragments, the kernel should not blindly trust firmware behavior.\nMalicious, buggy, or compromised firmware could potentially craft packets\nwith more fragments than the kernel expects.\n\nFix this by adding a bounds check before calling skb_add_rx_frag() to\nensure nr_frags does not exceed MAX_SKB_FRAGS.\n\nThe check must be performed before unmapping to avoid a page leak\nand double DMA unmap during device teardown."
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      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: wwan: t7xx: corrige un potencial desbordamiento de skb->frags en la ruta RX\n\nAl recibir datos en la ruta RX de DPMAIF, la función t7xx_dpmaif_set_frag_to_skb() añade fragmentos de página a un skb sin comprobar si el número de fragmentos ha excedido MAX_SKB_FRAGS. Esto podría conducir a un desbordamiento de búfer en el array skb_shinfo(skb)->frags[], corrompiendo memoria adyacente y potencialmente causando fallos del kernel u otro comportamiento indefinido.\n\nEste problema fue identificado a través de análisis de código estático comparando con una vulnerabilidad similar corregida en el commit b102f0c522cf del controlador mt76 ('mt76: corrige el desbordamiento del array al recibir demasiados fragmentos para un paquete').\n\nLa vulnerabilidad podría ser activada si el firmware del módem envía paquetes con fragmentos excesivos. Si bien bajo condiciones normales del protocolo (MTU 3080 bytes, búfer BAT 3584 bytes), un solo paquete no debería requerir fragmentos adicionales, el kernel no debería confiar ciegamente en el comportamiento del firmware. Firmware malicioso, con errores o comprometido podría potencialmente crear paquetes con más fragmentos de los que el kernel espera.\n\nSolucione esto añadiendo una comprobación de límites antes de llamar a skb_add_rx_frag() para asegurar que nr_frags no exceda MAX_SKB_FRAGS.\n\nLa comprobación debe realizarse antes de desmapear para evitar una fuga de página y un doble desmapeo DMA durante el desmontaje del dispositivo."
    }
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  "lastModified": "2026-06-17T10:21:02.127",
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