CVE-2024-56531
Vulnérabilité élevée dans Linux (Linux)
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.
Gravité et risque d'exploitation
CVE-2024-56531 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.22 %, ce qui la place devant 12.2 % des CVE référencées.
Que faire ?
- Vérifiez si Linux (versions 6.13, <=6.1.*, <=6.12.*, <3993edf44d3df7b6e8c753eac6ac8783473fcbab, <=6.11.*, 523f1dce37434a9a6623bf46e7893e2b4b10ac3c, 0, 6.1.120, <dd0de8cb708951cebf727aa045e8242ba651bb52, <a3f9314752dbb6f6aa1f0f2b4c58243bda800738, 5.10.231, 5.15.174, 6.12.2, 6.6.64, <=5.10.*, <=6.6.*, <=5.4.*, <b04dcbb7f7b1908806b7dc22671cdbe78ff2b82c, 6.11.11, <=4.19.*, <2.6.22, 2.6.22, <cadf1d8e9ddcd74584ec961aeac14ac549b261d8, <4dd821dcbfcecf7af6a08370b0b217cde2818acf, <237f3faf0177bdde728fa3106d730d806436aa4d, <=*, <ebad462eec93b0f701dfe4de98990e7355283801, <=5.15.*, 5.4.287, <4507a8b9b30344c5ddd8219945f446d47e966a6d, 4.19.325) est présent sur votre parc.
- Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
- À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
- Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.
Références
- https://git.kernel.org/stable/c/3993edf44d3df7b6e8c753eac6ac8783473fcbab
- https://git.kernel.org/stable/c/ebad462eec93b0f701dfe4de98990e7355283801
- https://git.kernel.org/stable/c/4dd821dcbfcecf7af6a08370b0b217cde2818acf
- https://git.kernel.org/stable/c/cadf1d8e9ddcd74584ec961aeac14ac549b261d8
- https://git.kernel.org/stable/c/237f3faf0177bdde728fa3106d730d806436aa4d
- https://git.kernel.org/stable/c/4507a8b9b30344c5ddd8219945f446d47e966a6d
- https://git.kernel.org/stable/c/dd0de8cb708951cebf727aa045e8242ba651bb52
- https://git.kernel.org/stable/c/a3f9314752dbb6f6aa1f0f2b4c58243bda800738
- https://git.kernel.org/stable/c/b04dcbb7f7b1908806b7dc22671cdbe78ff2b82c