- Vulnerability/
- CVE-2024-56532
CVE-2024-56532: ALSA: us122l: Use snd_card_free_when_closed() at disconnection
First published: Fri Dec 27 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: ALSA: us122l: Use snd_card_free_when_closed() at disconnection The USB disconnect callback is supposed to be short and not too-long waiting. OTOH, the current code uses snd_card_free() at disconnection, but this waits for the close of all used fds, hence it can take long. It eventually blocks the upper layer USB ioctls, which may trigger a soft lockup. An easy workaround is to replace snd_card_free() with snd_card_free_when_closed(). This variant returns immediately while the release of resources is done asynchronously by the card device release at the last close. The loop of us122l->mmap_count check is dropped as well. The check is useless for the asynchronous operation with *_when_closed().
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Red Hat Kernel-devel | ||
| debian/linux | <=5.10.223-1 | 5.10.234-1 6.1.129-1 6.1.128-1 6.12.20-1 6.12.21-1 |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/020cbc4d7414f0962004213e2b7bc5cc607e9ec7
- https://git.kernel.org/stable/c/2938dd2648522336133c151dd67bb9bf01cbd390
- https://git.kernel.org/stable/c/75f418b249d84021865eaa59515d3ed9b75ce4d6
- https://git.kernel.org/stable/c/9a48bd2184b142c92a4e17eac074c61fcf975bc9
- https://git.kernel.org/stable/c/9b27924dc8d7f8a8c35e521287d4ccb9a006e597
- https://git.kernel.org/stable/c/9d5c530e4d70f64b1114f2cc29ac690ba7ac4a38
- https://git.kernel.org/stable/c/b7df09bb348016943f56b09dcaafe221e3f73947
- https://git.kernel.org/stable/c/bc778ad3e495333eebda36fe91d5b2c93109cc16
- https://git.kernel.org/stable/c/bf0aa35a7cb8602cccf2387712114e836f65c154
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-56532
- https://nvd.nist.gov/vuln/detail/CVE-2024-56532
- https://launchpad.net/bugs/cve/CVE-2024-56532
- https://security-tracker.debian.org/tracker/CVE-2024-56532
- https://ubuntu.com/security/CVE-2024-56532
- https://git.kernel.org/linus/b7df09bb348016943f56b09dcaafe221e3f73947
Frequently Asked Questions
What is the severity of CVE-2024-56532?
CVE-2024-56532 has a medium severity level due to its potential impact on system stability during USB disconnection.
How do I fix CVE-2024-56532?
To fix CVE-2024-56532, upgrade to a Linux kernel version of 6.1.123-1, 6.1.128-1, 6.12.12-1, or 6.12.15-1.
Which versions of the Linux kernel are affected by CVE-2024-56532?
CVE-2024-56532 affects Linux kernel versions up to and including 5.10.226-1.
What component is impacted by CVE-2024-56532?
CVE-2024-56532 impacts the ALSA USB driver related to the US122L audio interface.
Is CVE-2024-56532 present in Debian packages?
Yes, CVE-2024-56532 is present in Debian packages of the Linux kernel prior to version 5.10.227-1.
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