CVE-2024-56531
Last modified
CVE-2024-56531 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: ALSA: caiaq: 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. EPSS estimates a 0.21% chance of exploitation in the next 30 days.
Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: caiaq: 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. This patch also splits the code to the disconnect and the free phases; the former is called immediately at the USB disconnect callback while the latter is called from the card destructor.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 2.6.22, < 4.19.325 |
| Linux | Linux Kernel | >= 4.20, < 5.4.287 |
| Linux | Linux Kernel | >= 5.5, < 5.10.231 |
| Linux | Linux Kernel | >= 5.11, < 5.15.174 |
| Linux | Linux Kernel | >= 5.16, < 6.1.120 |
| Linux | Linux Kernel | >= 6.2, < 6.6.64 |
| Linux | Linux Kernel | >= 6.7, < 6.11.11 |
| Linux | Linux Kernel | >= 6.12, < 6.12.2 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
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