Heimdall Security Logo

CVE-2025-68245

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, <9b0bb18b4b9dc017c1825a2c5e763615e34a1593, 0, efa95b01da18ad22af62f6d99a3243f3be8fd264, 6.18, <9a51b5ccd1c79afec1c03a4e1e6688da52597556, 5.10.247, <=5.10.*, <=6.6.*, 6.17.9, 5.4.302, <890472d6fbf062e6de7fdd56642cb305ab79d669, <=5.4.*, 6.6.117, 5.15.197, 6.1.159, 6.12.59, <c645693180a98606c430825223d2029315d85e9d, <4afd4ebbad52aa146838ec23082ba393e426a2bb, <49c8d2c1f94cc2f4d1a108530d7ba52614b874c2, <=*, <=5.15.*, <c79a6d9da29219616b118a3adce9a14cd30f9bd0, <=6.17.*, <3.17, 3.17, <8e6a50edad11e3e1426e4c29e7aa6201f3468ac2

Description

In the Linux kernel, the following vulnerability has been resolved: net: netpoll: fix incorrect refcount handling causing incorrect cleanup commit efa95b01da18 ("netpoll: fix use after free") incorrectly ignored the refcount and prematurely set dev->npinfo to NULL during netpoll cleanup, leading to improper behavior and memory leaks. Scenario causing lack of proper cleanup: 1) A netpoll is associated with a NIC (e.g., eth0) and netdev->npinfo is allocated, and refcnt = 1 - Keep in mind that npinfo is shared among all netpoll instances. In this case, there is just one. 2) Another netpoll is also associated with the same NIC and npinfo->refcnt += 1. - Now dev->npinfo->refcnt = 2; - There is just one npinfo associated to the netdev. 3) When the first netpolls goes to clean up: - The first cleanup succeeds and clears np->dev->npinfo, ignoring refcnt. - It basically calls `RCU_INIT_POINTER(np->dev->npinfo, NULL);` - Set dev->npinfo = NULL, without proper cleanup - No ->ndo_netpoll_cleanup() is either called 4) Now the second target tries to clean up - The second cleanup fails because np->dev->npinfo is already NULL. * In this case, ops->ndo_netpoll_cleanup() was never called, and the skb pool is not cleaned as well (for the second netpoll instance) - This leaks npinfo and skbpool skbs, which is clearly reported by kmemleak. Revert commit efa95b01da18 ("netpoll: fix use after free") and adds clarifying comments emphasizing that npinfo cleanup should only happen once the refcount reaches zero, ensuring stable and correct netpoll behavior.

Gravité et risque d'exploitation

CVE-2025-68245 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 0.20 %, ce qui la place devant 9.4 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <9b0bb18b4b9dc017c1825a2c5e763615e34a1593, 0, efa95b01da18ad22af62f6d99a3243f3be8fd264, 6.18, <9a51b5ccd1c79afec1c03a4e1e6688da52597556, 5.10.247, <=5.10.*, <=6.6.*, 6.17.9, 5.4.302, <890472d6fbf062e6de7fdd56642cb305ab79d669, <=5.4.*, 6.6.117, 5.15.197, 6.1.159, 6.12.59, <c645693180a98606c430825223d2029315d85e9d, <4afd4ebbad52aa146838ec23082ba393e426a2bb, <49c8d2c1f94cc2f4d1a108530d7ba52614b874c2, <=*, <=5.15.*, <c79a6d9da29219616b118a3adce9a14cd30f9bd0, <=6.17.*, <3.17, 3.17, <8e6a50edad11e3e1426e4c29e7aa6201f3468ac2) 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

Rechercher une autre CVE