CVE-2026-46307

Estado: AnalizadaAlta (8.3)—

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

wifi: ath5k: do not access array OOB

Vincent reports: > The ath5k driver seems to do an array-index-out-of-bounds access as > shown by the UBSAN kernel message: > UBSAN: array-index-out-of-bounds in drivers/net/wireless/ath/ath5k/base.c:1741:20 > index 4 is out of range for type 'ieee80211_tx_rate [4]' > ... > Call Trace: > <TASK> > dump_stack_lvl+0x5d/0x80 > ubsan_epilogue+0x5/0x2b > __ubsan_handle_out_of_bounds.cold+0x46/0x4b > ath5k_tasklet_tx+0x4e0/0x560 [ath5k] > tasklet_action_common+0xb5/0x1c0

It is real. 'ts->ts_final_idx' can be 3 on 5212, so: info->status.rates[ts->ts_final_idx + 1].idx = -1; with the array defined as: struct ieee80211_tx_rate rates[IEEE80211_TX_MAX_RATES]; while the size is: #define IEEE80211_TX_MAX_RATES 4 is indeed bogus.

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Set this 'idx = -1' sentinel only if the array index is less than the array size. As mac80211 will not look at rates beyond the size (IEEE80211_TX_MAX_RATES).

Note: The effect of the OOB write is negligible. It just overwrites the next member of info->status, i.e. ack_signal.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Puntuación base: 8.3

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.35%
Percentil entre todas las CVEs puntuadas: 27
Fecha de la puntuación: 5/10/2026

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

ExplotaciónT1210 Exploitation of Remote Serviceslateral movement40 %
Impacto principalT1068 Exploitation for Privilege Escalationprivilege escalation65 %
Impacto secundarioT1059 Command and Scripting Interpreterexecution35 %

Vulnerabilidad de OOB en controlador ath5k (AV:A, requiere red adyacente). El desbordamiento de buffer puede permitir escalada de privilegios del kernel o ejecución de código, aunque el efecto inmediato sea limitado (sobrescribe ack_signal).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence Program Privileged Account Management Execution Prevention Disable or Remove Feature or Program Application Isolation and Sandboxing Exploit Protection

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-125

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath5k: do not access array OOB\n\nVincent reports:\n> The ath5k driver seems to do an array-index-out-of-bounds access as\n> shown by the UBSAN kernel message:\n> UBSAN: array-index-out-of-bounds in drivers/net/wireless/ath/ath5k/base.c:1741:20\n> index 4 is out of range for type 'ieee80211_tx_rate [4]'\n> ...\n> Call Trace:\n>  <TASK>\n>  dump_stack_lvl+0x5d/0x80\n>  ubsan_epilogue+0x5/0x2b\n>  __ubsan_handle_out_of_bounds.cold+0x46/0x4b\n>  ath5k_tasklet_tx+0x4e0/0x560 [ath5k]\n>  tasklet_action_common+0xb5/0x1c0\n\nIt is real. 'ts->ts_final_idx' can be 3 on 5212, so:\n   info->status.rates[ts->ts_final_idx + 1].idx = -1;\nwith the array defined as:\n   struct ieee80211_tx_rate rates[IEEE80211_TX_MAX_RATES];\nwhile the size is:\n   #define IEEE80211_TX_MAX_RATES  4\nis indeed bogus.\n\nSet this 'idx = -1' sentinel only if the array index is less than the\narray size. As mac80211 will not look at rates beyond the size\n(IEEE80211_TX_MAX_RATES).\n\nNote: The effect of the OOB write is negligible. It just overwrites the\nnext member of info->status, i.e. ack_signal."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nwifi: ath5k: no acceder al array OOB\n\nVincent informa:\n> El controlador ath5k parece realizar un acceso de índice de array fuera de límites como\n> mostrado por el mensaje del kernel de UBSAN:\n> UBSAN: índice de array fuera de límites en drivers/net/wireless/ath/ath5k/base.c:1741:20\n> el índice 4 está fuera de rango para el tipo 'ieee80211_tx_rate [4]'\n> ...\n> Traza de Llamada:\n> <TAREA>\n> dump_stack_lvl+0x5d/0x80\n> ubsan_epilogue+0x5/0x2b\n> __ubsan_handle_out_of_bounds.cold+0x46/0x4b\n> ath5k_tasklet_tx+0x4e0/0x560 [ath5k]\n> tasklet_action_common+0xb5/0x1c0\n\nEs real. 'ts->ts_final_idx' puede ser 3 en 5212, así que:\n   info->status.rates[ts->ts_final_idx + 1].idx = -1;\ncon el array definido como:\n   struct ieee80211_tx_rate rates[IEEE80211_TX_MAX_RATES];\nmientras que el tamaño es:\n   #define IEEE80211_TX_MAX_RATES  4\nes de hecho erróneo.\n\nEstablecer este centinela 'idx = -1' solo si el índice del array es menor que el tamaño del array. Ya que mac80211 no buscará tasas más allá del tamaño (IEEE80211_TX_MAX_RATES).\n\nNota: El efecto de la escritura OOB es insignificante. Simplemente sobrescribe el siguiente miembro de info->status, es decir, ack_signal."
    }
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  "lastModified": "2026-07-23T08:10:00.137",
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