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CVE-2026-64188

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.1%
Linux•Linux•Versions : <d00c953a8f69921f484b629801766da68f27f658, <=6.1.*, <=7.0.*, <=6.12.*, 6.6.144, 5.15.211, 7.0.14, 0, <41e06fcc5df0774d212e70c5b503fc769492bce3, ceed73a2cf4aff2921802aa3d21d45280677547d, <1078ae8175777e80c9637996fb4a46c55f0ce576, <9918698cf3aee4032e12bb42fd5a951dc465339b, <f193e38cb257d033060b63f1cfd94af076b3a2ab, 5.10.260, <310b93246bfec7d4452507e0c15477377ed9f025, <=5.10.*, <=6.6.*, 6.12.95, 6.18.37, 7.1, <=6.18.*, 6.1.177, <=*, <4.14, <=5.15.*, <c4e676c3505c5058922dc1a6f1ded795f6758135, 4.14, <8b17adf6d4fb6bf61fa4c3f58366a7c082799a71

Description

In the Linux kernel, the following vulnerability has been resolved: net: qualcomm: rmnet: fix endpoint use-after-free in rmnet_dellink() rmnet_dellink() removes the endpoint from the hash table with hlist_del_init_rcu() and then immediately frees it with kfree(). However, RCU readers on the receive path (rmnet_rx_handler -> __rmnet_map_ingress_handler) may still hold a reference to the endpoint and dereference ep->egress_dev after the memory has been freed. The endpoint is a kmalloc-32 object, and the stale read at offset 8 corresponds to the egress_dev pointer. BUG: unable to handle page fault for address: ffffffffde942eef Oops: 0002 [#1] SMP NOPTI CPU: 1 UID: 0 PID: 137 Comm: poc_write Not tainted 7.0.0+ #4 PREEMPTLAZY RIP: 0010:rmnet_vnd_rx_fixup (rmnet_vnd.c:27) Call Trace: <TASK> __rmnet_map_ingress_handler (rmnet_handlers.c:48 rmnet_handlers.c:101) rmnet_rx_handler (rmnet_handlers.c:129 rmnet_handlers.c:235) __netif_receive_skb_core.constprop.0 (net/core/dev.c:6096) __netif_receive_skb_one_core (net/core/dev.c:6208) netif_receive_skb (net/core/dev.c:6467) tun_get_user (drivers/net/tun.c:1955) tun_chr_write_iter (drivers/net/tun.c:2003) vfs_write (fs/read_write.c:688) ksys_write (fs/read_write.c:740) </TASK> Add an rcu_head field to struct rmnet_endpoint and replace kfree() with kfree_rcu() so the endpoint memory remains valid through the RCU grace period. Also remove the rmnet_vnd_dellink() call and inline only the nr_rmnet_devs decrement, since rmnet_vnd_dellink() would set ep->egress_dev to NULL during the grace period, creating a data race with lockless readers.

Gravité et risque d'exploitation

CVE-2026-64188 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 0.12 %, ce qui la place devant 1.6 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <d00c953a8f69921f484b629801766da68f27f658, <=6.1.*, <=7.0.*, <=6.12.*, 6.6.144, 5.15.211, 7.0.14, 0, <41e06fcc5df0774d212e70c5b503fc769492bce3, ceed73a2cf4aff2921802aa3d21d45280677547d, <1078ae8175777e80c9637996fb4a46c55f0ce576, <9918698cf3aee4032e12bb42fd5a951dc465339b, <f193e38cb257d033060b63f1cfd94af076b3a2ab, 5.10.260, <310b93246bfec7d4452507e0c15477377ed9f025, <=5.10.*, <=6.6.*, 6.12.95, 6.18.37, 7.1, <=6.18.*, 6.1.177, <=*, <4.14, <=5.15.*, <c4e676c3505c5058922dc1a6f1ded795f6758135, 4.14, <8b17adf6d4fb6bf61fa4c3f58366a7c082799a71) 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

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