CVE-2024-26654: ALSA: sh: aica: reorder cleanup operations to avoid UAF bugs
First published: Mon Apr 01 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.11-1 6.12.12-1 | |
| Linux Kernel | >=2.6.23<4.19.312 | |
| Linux Kernel | >=4.20<5.4.274 | |
| Linux Kernel | >=5.5<5.10.215 | |
| Linux Kernel | >=5.11<5.15.154 | |
| Linux Kernel | >=5.16<6.1.84 | |
| Linux Kernel | >=6.2<6.6.24 | |
| Linux Kernel | >=6.7<6.7.12 | |
| Linux Kernel | >=6.8<6.8.3 | |
| Linux Kernel | =6.9-rc1 | |
| Debian Debian Linux | =10.0 |
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Reference Links
- 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://launchpad.net/bugs/cve/CVE-2024-26654
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26654
- https://nvd.nist.gov/vuln/detail/CVE-2024-26654
- https://security-tracker.debian.org/tracker/CVE-2024-26654
- https://ubuntu.com/security/CVE-2024-26654
- https://git.kernel.org/linus/051e0840ffa8ab25554d6b14b62c9ab9e4901457
Frequently Asked Questions
What is the severity of CVE-2024-26654?
CVE-2024-26654 is classified as a medium severity vulnerability in the Linux kernel affecting ALSA.
How do I fix CVE-2024-26654?
To remediate CVE-2024-26654, update to the following versions of the Linux package: 5.10.223-1, 5.10.226-1, 6.1.123-1, 6.1.119-1, 6.12.10-1, or 6.12.11-1.
What are the potential impacts of CVE-2024-26654?
The impacts of CVE-2024-26654 can include user-after-free errors potentially leading to memory corruption.
Is my system affected by CVE-2024-26654?
If you are using an affected Linux kernel version prior to the fixed releases, your system may be vulnerable to CVE-2024-26654.
When was CVE-2024-26654 first reported?
CVE-2024-26654 was reported in early 2024 as a vulnerability in the Linux kernel related to ALSA.
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