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PUBLISHED

CVE-2024-26654

ALSA: sh: aica: reorder cleanup operations to avoid UAF bugs

Reserved:2024-02-19
Published:2024-04-01
Updated:2024-04-13

Description

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.

Product status

Default status
unaffected

198de43d758c before eeb2a2ca0b8d
affected

198de43d758c before 4206ad65a0ee
affected

198de43d758c before aa39e6878f61
affected

198de43d758c before 8c9902216816
affected

198de43d758c before 9d66ae0e7bb7
affected

198de43d758c before 61d4787692c1
affected

198de43d758c before e955e8a7f38a
affected

198de43d758c before 3c907bf56905
affected

198de43d758c before 051e0840ffa8
affected

Default status
affected

2.6.23
affected

Any version before 2.6.23
unaffected

4.19.312
unaffected

5.4.274
unaffected

5.10.215
unaffected

5.15.154
unaffected

6.1.84
unaffected

6.6.24
unaffected

6.7.12
unaffected

6.8.3
unaffected

6.9-rc2
unaffected

References

https://git.kernel.org/stable/c/eeb2a2ca0b8de7e1c66afaf719529154e7dc60b2

https://git.kernel.org/stable/c/4206ad65a0ee76920041a755bd3c17c6ba59bba2

https://git.kernel.org/stable/c/aa39e6878f61f50892ee2dd9d2176f72020be845

https://git.kernel.org/stable/c/8c990221681688da34295d6d76cc2f5b963e83f5

https://git.kernel.org/stable/c/9d66ae0e7bb78b54e1e0525456c6b54e1d132046

https://git.kernel.org/stable/c/61d4787692c1fccdc268ffa7a891f9c149f50901

https://git.kernel.org/stable/c/e955e8a7f38a856fc6534ba4e6bffd4d5cc80ac3

https://git.kernel.org/stable/c/3c907bf56905de7d27b329afaf59c2fb35d17b04

https://git.kernel.org/stable/c/051e0840ffa8ab25554d6b14b62c9ab9e4901457

cve.org CVE-2024-26654

nvd.nist.gov CVE-2024-26654

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