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CVE-2026-23444

Estado: ModificadaMedia (5.5)—

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

wifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure

ieee80211_tx_prepare_skb() has three error paths, but only two of them free the skb. The first error path (ieee80211_tx_prepare() returning TX_DROP) does not free it, while invoke_tx_handlers() failure and the fragmentation check both do.

Add kfree_skb() to the first error path so all three are consistent, and remove the now-redundant frees in callers (ath9k, mt76, mac80211_hwsim) to avoid double-free.

Document the skb ownership guarantee in the function's kdoc.

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)

Mostrar
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  "id": "CVE-2026-23444",
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            "drivers/net/wireless/mediatek/mt76/scan.c",
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            "include/net/mac80211.h",
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  "published": "2026-04-03T16:16:28.810",
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  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-401"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure\n\nieee80211_tx_prepare_skb() has three error paths, but only two of them\nfree the skb. The first error path (ieee80211_tx_prepare() returning\nTX_DROP) does not free it, while invoke_tx_handlers() failure and the\nfragmentation check both do.\n\nAdd kfree_skb() to the first error path so all three are consistent,\nand remove the now-redundant frees in callers (ath9k, mt76,\nmac80211_hwsim) to avoid double-free.\n\nDocument the skb ownership guarantee in the function's kdoc."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nwifi: mac80211: liberar siempre skb en caso de fallo de ieee80211_tx_prepare_skb()\n\nieee80211_tx_prepare_skb() tiene tres rutas de error, pero solo dos de ellas liberan el skb. La primera ruta de error (ieee80211_tx_prepare() devolviendo TX_DROP) no lo libera, mientras que el fallo de invoke_tx_handlers() y la comprobación de fragmentación sí lo hacen.\n\nAñadir kfree_skb() a la primera ruta de error para que las tres sean consistentes, y eliminar las liberaciones ahora redundantes en las funciones que llaman (ath9k, mt76, mac80211_hwsim) para evitar la doble liberación.\n\nDocumentar la garantía de propiedad del skb en el kdoc de la función."
    }
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  "lastModified": "2026-07-24T21:10:00.143",
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