CVE-2025-40219

Description

In the Linux kernel, the following vulnerability has been resolved: PCI/IOV: Fix race between SR-IOV enable/disable and hotplug Commit 05703271c3cd ("PCI/IOV: Add PCI rescan-remove locking when enabling/disabling SR-IOV") tried to fix a race between the VF removal inside sriov_del_vfs() and concurrent hot unplug by taking the PCI rescan/remove lock in sriov_del_vfs(). Similarly the PCI rescan/remove lock was also taken in sriov_add_vfs() to protect addition of VFs. This approach however causes deadlock on trying to remove PFs with SR-IOV enabled because PFs disable SR-IOV during removal and this removal happens under the PCI rescan/remove lock. So the original fix had to be reverted. Instead of taking the PCI rescan/remove lock in sriov_add_vfs() and sriov_del_vfs(), fix the race that occurs with SR-IOV enable and disable vs hotplug higher up in the callchain by taking the lock in sriov_numvfs_store() before calling into the driver's sriov_configure() callback.

Gravité et risque d'exploitation

CVE-2025-40219 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. 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 <=6.1.*, <=6.12.*, <f3015627b6e9ddf85cfeaf42405b3c194dde2c36, 18f9e9d150fccfa747875df6f0a9f606740762b3, <a5338e365c4559d7b4d7356116b0eb95b12e08d5, <1047ca2d816994f31e1475e63e0c0b7825599747, 0, 7.0, <7c37920c96b85ef4255a7acc795e99e63dd38d59, 6.1.165, <d7673ac466eca37ec3e6b7cc9ccdb06de3304e9b, 6.12.75, <3cddde484471c602bea04e6f384819d336a1ff84, <97c18f074ff1c12d016a0753072a3afdfa0b9611, <=5.10.*, <=6.6.*, <=6.19.*, 5.0, <5.0, <=6.18.*, 6.19.6, 6.6.128, 5.10.252, 6.18.16, <=*, <=5.15.*, 5.15.202, <bea1d373098b22d7142da48750ce5526096425bc) 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/3cddde484471c602bea04e6f384819d336a1ff84
• https://git.kernel.org/stable/c/d7673ac466eca37ec3e6b7cc9ccdb06de3304e9b
• https://git.kernel.org/stable/c/7c37920c96b85ef4255a7acc795e99e63dd38d59
• https://git.kernel.org/stable/c/1047ca2d816994f31e1475e63e0c0b7825599747
• https://git.kernel.org/stable/c/97c18f074ff1c12d016a0753072a3afdfa0b9611
• https://git.kernel.org/stable/c/bea1d373098b22d7142da48750ce5526096425bc
• https://git.kernel.org/stable/c/f3015627b6e9ddf85cfeaf42405b3c194dde2c36
• https://git.kernel.org/stable/c/a5338e365c4559d7b4d7356116b0eb95b12e08d5