CVE-2024-56531
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.
Does this matter?
Lower severity and a low EPSS score (0.22%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.22% probability · 13th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-667
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/237f3faf0177bdde728fa3106d730d806436aa4dPatch
- https://git.kernel.org/stable/c/3993edf44d3df7b6e8c753eac6ac8783473fcbabPatch
- https://git.kernel.org/stable/c/4507a8b9b30344c5ddd8219945f446d47e966a6dPatch
- https://git.kernel.org/stable/c/4dd821dcbfcecf7af6a08370b0b217cde2818acfPatch
- https://git.kernel.org/stable/c/a3f9314752dbb6f6aa1f0f2b4c58243bda800738Patch
- https://git.kernel.org/stable/c/b04dcbb7f7b1908806b7dc22671cdbe78ff2b82cPatch
- https://git.kernel.org/stable/c/cadf1d8e9ddcd74584ec961aeac14ac549b261d8Patch
- https://git.kernel.org/stable/c/dd0de8cb708951cebf727aa045e8242ba651bb52Patch
- https://git.kernel.org/stable/c/ebad462eec93b0f701dfe4de98990e7355283801Patch
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.