cve-2024-26654
Vulnerability from cvelistv5
Published
2024-04-01 08:35
Modified
2024-12-19 08:44
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: sh: aica: reorder cleanup operations to avoid UAF bugs The dreamcastcard->timer could schedule the spu_dma_work and the spu_dma_work could also arm the dreamcastcard->timer. When the snd_pcm_substream is closing, the aica_channel will be deallocated. But it could still be dereferenced in the worker thread. The reason is that del_timer() will return directly regardless of whether the timer handler is running or not and the worker could be rescheduled in the timer handler. As a result, the UAF bug will happen. The racy situation is shown below: (Thread 1) | (Thread 2) snd_aicapcm_pcm_close() | ... | run_spu_dma() //worker | mod_timer() flush_work() | del_timer() | aica_period_elapsed() //timer kfree(dreamcastcard->channel) | schedule_work() | run_spu_dma() //worker ... | dreamcastcard->channel-> //USE In order to mitigate this bug and other possible corner cases, call mod_timer() conditionally in run_spu_dma(), then implement PCM sync_stop op to cancel both the timer and worker. The sync_stop op will be called from PCM core appropriately when needed.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/051e0840ffa8ab25554d6b14b62c9ab9e4901457
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3c907bf56905de7d27b329afaf59c2fb35d17b04
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4206ad65a0ee76920041a755bd3c17c6ba59bba2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/61d4787692c1fccdc268ffa7a891f9c149f50901
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8c990221681688da34295d6d76cc2f5b963e83f5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9d66ae0e7bb78b54e1e0525456c6b54e1d132046
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aa39e6878f61f50892ee2dd9d2176f72020be845
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e955e8a7f38a856fc6534ba4e6bffd4d5cc80ac3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eeb2a2ca0b8de7e1c66afaf719529154e7dc60b2
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/051e0840ffa8ab25554d6b14b62c9ab9e4901457
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3c907bf56905de7d27b329afaf59c2fb35d17b04
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4206ad65a0ee76920041a755bd3c17c6ba59bba2
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/61d4787692c1fccdc268ffa7a891f9c149f50901
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/8c990221681688da34295d6d76cc2f5b963e83f5
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9d66ae0e7bb78b54e1e0525456c6b54e1d132046
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/aa39e6878f61f50892ee2dd9d2176f72020be845
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e955e8a7f38a856fc6534ba4e6bffd4d5cc80ac3
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/eeb2a2ca0b8de7e1c66afaf719529154e7dc60b2
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
Impacted products
Vendor Product Version
Linux Linux Version: 2.6.23
Show details on NVD website

To clipboard 

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: sh: aica: reorder cleanup operations to avoid UAF bugs\n\nThe dreamcastcard-\u003etimer could schedule the spu_dma_work and the\nspu_dma_work could also arm the dreamcastcard-\u003etimer.\n\nWhen the snd_pcm_substream is closing, the aica_channel will be\ndeallocated. But it could still be dereferenced in the worker\nthread. The reason is that del_timer() will return directly\nregardless of whether the timer handler is running or not and\nthe worker could be rescheduled in the timer handler. As a result,\nthe UAF bug will happen. The racy situation is shown below:\n\n      (Thread 1)                 |      (Thread 2)\nsnd_aicapcm_pcm_close()          |\n ...                             |  run_spu_dma() //worker\n                                 |    mod_timer()\n  flush_work()                   |\n  del_timer()                    |  aica_period_elapsed() //timer\n  kfree(dreamcastcard-\u003echannel)  |    schedule_work()\n                                 |  run_spu_dma() //worker\n  ...                            |    dreamcastcard-\u003echannel-\u003e //USE\n\nIn order to mitigate this bug and other possible corner cases,\ncall mod_timer() conditionally in run_spu_dma(), then implement\nPCM sync_stop op to cancel both the timer and worker. The sync_stop\nop will be called from PCM core appropriately when needed."
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26654\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-01T09:15:51.063\",\"lastModified\":\"2024-11-21T09:02:46.457\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nALSA: sh: aica: reorder cleanup operations to avoid UAF bugs\\n\\nThe dreamcastcard-\u003etimer could schedule the spu_dma_work and the\\nspu_dma_work could also arm the dreamcastcard-\u003etimer.\\n\\nWhen the snd_pcm_substream is closing, the aica_channel will be\\ndeallocated. But it could still be dereferenced in the worker\\nthread. The reason is that del_timer() will return directly\\nregardless of whether the timer handler is running or not and\\nthe worker could be rescheduled in the timer handler. As a result,\\nthe UAF bug will happen. The racy situation is shown below:\\n\\n      (Thread 1)                 |      (Thread 2)\\nsnd_aicapcm_pcm_close()          |\\n ...                             |  run_spu_dma() //worker\\n                                 |    mod_timer()\\n  flush_work()                   |\\n  del_timer()                    |  aica_period_elapsed() //timer\\n  kfree(dreamcastcard-\u003echannel)  |    schedule_work()\\n                                 |  run_spu_dma() //worker\\n  ...                            |    dreamcastcard-\u003echannel-\u003e //USE\\n\\nIn order to mitigate this bug and other possible corner cases,\\ncall mod_timer() conditionally in run_spu_dma(), then implement\\nPCM sync_stop op to cancel both the timer and worker. The sync_stop\\nop will be called from PCM core appropriately when needed.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ALSA: sh: aica: reordenar operaciones de limpieza para evitar errores UAF. El dreamcastcard-\u0026gt;timer podr\u00eda programar el spu_dma_work y el spu_dma_work tambi\u00e9n podr\u00eda armar el dreamcastcard-\u0026gt;timer. Cuando se cierre snd_pcm_substream, se desasignar\u00e1 aica_channel. Pero a\u00fan se podr\u00eda eliminar la referencia en el hilo del trabajador. La raz\u00f3n es que del_timer() regresar\u00e1 directamente independientemente de si el controlador del temporizador se est\u00e1 ejecutando o no y el trabajador podr\u00eda reprogramarse en el controlador del temporizador. Como resultado, se producir\u00e1 el error UAF. La situaci\u00f3n picante se muestra a continuaci\u00f3n: (Thread 1) | (Thread 2) snd_aicapcm_pcm_close() | ... | run_spu_dma() //worker | mod_timer() flush_work() | del_timer() | aica_period_elapsed() //timer kfree(dreamcastcard-\u0026gt;channel) | schedule_work() | run_spu_dma() //worker ... | dreamcastcard-\u0026gt;channel-\u0026gt; //USE Para mitigar este error y otros posibles casos extremos, llame a mod_timer() condicionalmente en run_spu_dma(), luego implemente la operaci\u00f3n PCM sync_stop para cancelar tanto el temporizador como el trabajador. La operaci\u00f3n sync_stop se llamar\u00e1 desde el n\u00facleo PCM de forma adecuada cuando sea necesario.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/051e0840ffa8ab25554d6b14b62c9ab9e4901457\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3c907bf56905de7d27b329afaf59c2fb35d17b04\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4206ad65a0ee76920041a755bd3c17c6ba59bba2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/61d4787692c1fccdc268ffa7a891f9c149f50901\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8c990221681688da34295d6d76cc2f5b963e83f5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9d66ae0e7bb78b54e1e0525456c6b54e1d132046\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aa39e6878f61f50892ee2dd9d2176f72020be845\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e955e8a7f38a856fc6534ba4e6bffd4d5cc80ac3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eeb2a2ca0b8de7e1c66afaf719529154e7dc60b2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/051e0840ffa8ab25554d6b14b62c9ab9e4901457\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/3c907bf56905de7d27b329afaf59c2fb35d17b04\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/4206ad65a0ee76920041a755bd3c17c6ba59bba2\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/61d4787692c1fccdc268ffa7a891f9c149f50901\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/8c990221681688da34295d6d76cc2f5b963e83f5\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/9d66ae0e7bb78b54e1e0525456c6b54e1d132046\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/aa39e6878f61f50892ee2dd9d2176f72020be845\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/e955e8a7f38a856fc6534ba4e6bffd4d5cc80ac3\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/eeb2a2ca0b8de7e1c66afaf719529154e7dc60b2\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
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}


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