CVE-2025-38097

Description

In the Linux kernel, the following vulnerability has been resolved: espintcp: remove encap socket caching to avoid reference leak The current scheme for caching the encap socket can lead to reference leaks when we try to delete the netns. The reference chain is: xfrm_state -> enacp_sk -> netns Since the encap socket is a userspace socket, it holds a reference on the netns. If we delete the espintcp state (through flush or individual delete) before removing the netns, the reference on the socket is dropped and the netns is correctly deleted. Otherwise, the netns may not be reachable anymore (if all processes within the ns have terminated), so we cannot delete the xfrm state to drop its reference on the socket. This patch results in a small (~2% in my tests) performance regression. A GC-type mechanism could be added for the socket cache, to clear references if the state hasn't been used "recently", but it's a lot more complex than just not caching the socket.

Gravité et risque d'exploitation

CVE-2025-38097 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 0.20 %, ce qui la place devant 9.3 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <=6.14.*, 5.15.221, <e4cde54b46a87231c77256a633be1bef62687d69, 5.10.270, 0, 6.1.141, <9673ca00e6c5503069dc98780e2e89db0e663c16, 6.6.93, 5.6, <74fd327767fb784c5875cf7c4ba1217f26020943, <=5.10.*, <=6.6.*, 6.14.9, <e32bafd08ee35feacd47b05cc5bfe9cd9659cd25, <028363685bd0b7a19b4a820f82dd905b1dc83999, <b58a295d10065960bcb9d60cb8ca6ead9837cd27, 6.12.31, 6.15, <5.6, <=*, <=5.15.*, e27cca96cd68fa2c6814c90f9a1cfd36bb68c593, <9cbca30102028f9ad3d2098f935c4368f581fd07) 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/e32bafd08ee35feacd47b05cc5bfe9cd9659cd25
• https://git.kernel.org/stable/c/9673ca00e6c5503069dc98780e2e89db0e663c16
• https://git.kernel.org/stable/c/e4cde54b46a87231c77256a633be1bef62687d69
• https://git.kernel.org/stable/c/b58a295d10065960bcb9d60cb8ca6ead9837cd27
• https://git.kernel.org/stable/c/9cbca30102028f9ad3d2098f935c4368f581fd07
• https://git.kernel.org/stable/c/74fd327767fb784c5875cf7c4ba1217f26020943
• https://git.kernel.org/stable/c/028363685bd0b7a19b4a820f82dd905b1dc83999