CVE-2024-26654
Status: ModifiedHigh (7)—
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:
Read full descriptionShow less
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.
Technical details traces, logs and code from the original report
(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-> //USECVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Base score: 7
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 0.26%
- Percentile among all scored CVEs: 16
- Score date: 10/8/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (2)
CWEs
- CWE-416
References
- https://git.kernel.org/stable/c/051e0840ffa8ab25554d6b14b62c9ab9e4901457
- https://git.kernel.org/stable/c/3c907bf56905de7d27b329afaf59c2fb35d17b04
- https://git.kernel.org/stable/c/4206ad65a0ee76920041a755bd3c17c6ba59bba2
- https://git.kernel.org/stable/c/61d4787692c1fccdc268ffa7a891f9c149f50901
- https://git.kernel.org/stable/c/8c990221681688da34295d6d76cc2f5b963e83f5
- https://git.kernel.org/stable/c/9d66ae0e7bb78b54e1e0525456c6b54e1d132046
- https://git.kernel.org/stable/c/aa39e6878f61f50892ee2dd9d2176f72020be845
- https://git.kernel.org/stable/c/e955e8a7f38a856fc6534ba4e6bffd4d5cc80ac3
- https://git.kernel.org/stable/c/eeb2a2ca0b8de7e1c66afaf719529154e7dc60b2
- https://git.kernel.org/stable/c/051e0840ffa8ab25554d6b14b62c9ab9e4901457
- https://git.kernel.org/stable/c/3c907bf56905de7d27b329afaf59c2fb35d17b04
- https://git.kernel.org/stable/c/4206ad65a0ee76920041a755bd3c17c6ba59bba2
- https://git.kernel.org/stable/c/61d4787692c1fccdc268ffa7a891f9c149f50901
- https://git.kernel.org/stable/c/8c990221681688da34295d6d76cc2f5b963e83f5
- https://git.kernel.org/stable/c/9d66ae0e7bb78b54e1e0525456c6b54e1d132046
- https://git.kernel.org/stable/c/aa39e6878f61f50892ee2dd9d2176f72020be845
- https://git.kernel.org/stable/c/e955e8a7f38a856fc6534ba4e6bffd4d5cc80ac3
- https://git.kernel.org/stable/c/eeb2a2ca0b8de7e1c66afaf719529154e7dc60b2
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
Raw JSON (NVD)
Show
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"descriptions": [
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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->timer could schedule the spu_dma_work and the\nspu_dma_work could also arm the dreamcastcard->timer.\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->channel) | schedule_work()\n | run_spu_dma() //worker\n ... | dreamcastcard->channel-> //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->timer podría programar el spu_dma_work y el spu_dma_work también podría armar el dreamcastcard->timer. Cuando se cierre snd_pcm_substream, se desasignará aica_channel. Pero aún se podría eliminar la referencia en el hilo del trabajador. La razón es que del_timer() regresará directamente independientemente de si el controlador del temporizador se está ejecutando o no y el trabajador podría reprogramarse en el controlador del temporizador. Como resultado, se producirá el error UAF. La situación picante se muestra a continuación: (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 Para mitigar este error y otros posibles casos extremos, llame a mod_timer() condicionalmente en run_spu_dma(), luego implemente la operación PCM sync_stop para cancelar tanto el temporizador como el trabajador. La operación sync_stop se llamará desde el núcleo PCM de forma adecuada cuando sea necesario."
}
],
"lastModified": "2026-08-04T11:16:53.580",
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