CVE-2024-26654

HIGH
Published Apr 1, 2024 Modified Feb 3, 2025 CWE-416

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.

Is your site exposed to CVE-2024-26654?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

7.0
HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
debian debian_linux

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2024-26654? +
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. It has a CVSS v3.1 base score of 7.0 (HIGH).
How severe is CVE-2024-26654? +
CVE-2024-26654 has a CVSS v3.1 score of 7.0 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.
What products are affected by CVE-2024-26654? +
CVE-2024-26654 affects products from debian, linux, specifically: debian_linux, linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2024-26654? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-55406

Buffa is a pure-Rust Protocol Buffers implementation with first-class protobuf editions support. Prior to 0.7.0, a soundness bug in the …
CVE-2026-6040

A heap use-after-free existed when importing the blank-width characters of an ODF number format. A position value read from the …
CVE-2025-24898

rust-openssl is a set of OpenSSL bindings for the Rust programming language. In affected versions `ssl::select_next_proto` can return a slice …
CVE-2025-31115

XZ Utils provide a general-purpose data-compression library plus command-line tools. In XZ Utils 5.3.3alpha to 5.8.0, the multithreaded .xz decoder …
CVE-2025-31498

c-ares is an asynchronous resolver library. From 1.32.3 through 1.34.4, there is a use-after-free in read_answers() when process_answer() may re-enqueue …
CVE-2025-4516

There is an issue in CPython when using `bytes.decode("unicode_escape", error="ignore|replace")`. If you are not using the "unicode_escape" encoding or an …

Don't wait for an exploit

Scan your website for vulnerabilities like CVE-2024-26654 — free, no signup required.