CVE-2025-38524

Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix recv-recv race of completed call If a call receives an event (such as incoming data), the call gets placed on the socket's queue and a thread in recvmsg can be awakened to go and process it. Once the thread has picked up the call off of the queue, further events will cause it to be requeued, and once the socket lock is dropped (recvmsg uses call->user_mutex to allow the socket to be used in parallel), a second thread can come in and its recvmsg can pop the call off the socket queue again. In such a case, the first thread will be receiving stuff from the call and the second thread will be blocked on call->user_mutex. The first thread can, at this point, process both the event that it picked call for and the event that the second thread picked the call for and may see the call terminate - in which case the call will be "released", decoupling the call from the user call ID assigned to it (RXRPC_USER_CALL_ID in the control message). The first thread will return okay, but then the second thread will wake up holding the user_mutex and, if it sees that the call has been released by the first thread, it will BUG thusly: kernel BUG at net/rxrpc/recvmsg.c:474! Fix this by just dequeuing the call and ignoring it if it is seen to be already released. We can't tell userspace about it anyway as the user call ID has become stale.

Gravité et risque d'exploitation

CVE-2025-38524 obtient un score CVSS de 7.5/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.27 %, ce qui la place devant 18.5 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.12.*, 6.6.100, 0, <=6.15.*, 6.15.8, <=5.10.*, <=6.6.*, <4aed0eeca58e26d752bb08b293b8dc75c6820b23, <6c75a97a32a5fa2060c3dd30207e63b6914b606d, 5.10.266, <7692bde890061797f3dece0148d7859e85c55778, 6.16, <4.9, 248f219cb8bcbfbd7f132752d44afa2df7c241d1, 6.12.40, <=*, 4.9, <839fe96c15209dc2255c064bb44b636efe04f032, <962fb1f651c2cf2083e0c3ef53ba69e3b96d3fbc) 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/4aed0eeca58e26d752bb08b293b8dc75c6820b23
• https://git.kernel.org/stable/c/7692bde890061797f3dece0148d7859e85c55778
• https://git.kernel.org/stable/c/839fe96c15209dc2255c064bb44b636efe04f032
• https://git.kernel.org/stable/c/6c75a97a32a5fa2060c3dd30207e63b6914b606d
• https://git.kernel.org/stable/c/962fb1f651c2cf2083e0c3ef53ba69e3b96d3fbc