CVE-2024-26654

    Dashboard / Vulnerabilities / CVE-2024-26654

    CVE-2024-26654

    Published: 1 Apr 2024Last Modified: 12 Aug 2026

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

    Details: 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: 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, https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26654.json, https://nvd.nist.gov/vuln/detail/CVE-2024-26654, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 198de43d758ca2700e2b52b49c0b189b4931466c
    Fixed -eeb2a2ca0b8de7e1c66afaf719529154e7dc60b2

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2024-26654 | CVE-DB