Heimdall Security Logo

CVE-2026-72491

Vulnérabilité critique dans Linux (Linux)

CVSS 9.8 · Critique
EPSS 0.7%
Linux•Linux•Versions : <=6.1.*, 7.1.5, <8aadc136d8e8d8fc95d7982d213cfe2234dfcf2b, <=6.12.*, 6.18.40, <151f8cf5b23d8a534d884432a82a6d54d5a61989, 4.20, 9e69c673fe077b8dc491cd8406c9bdcb1f76dee2, 0, <=7.1.*, <4.10, 4.14.132, <4.20, <7d54894a1ee265a72d70f7cae1da6cc774cccc71, 6.1.178, <=5.10.*, <3970a19a80de530b801b6256354d4a529a9a2d6c, <=6.6.*, 6.12.97, <4.5, 4.19.57, <=6.18.*, c01ddaa54d7411e964ffd250c018d8469c5852f2, 5.15.212, 6.6.145, 5.10.261, 4.4.185, <13bf9879b778b2f4b260b45bed18f31806120d1e, <ebbcbe5c0db215feecc17def06178da443f4eea6, e48e7e27e4dfd00c81e0381e7cee610cce021452, <=*, <=5.15.*, 3479b3c35e82ed10aa0ca2ee9e78c4eded06ba62, 4.9.185, <4.15, 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b, 7.2, <5424138848eb7d7d8a7196676e90a2cbf2142454, <4cee2b8766045059d5e0b8114837b4a8efe827ac

Description

In the Linux kernel, the following vulnerability has been resolved: net/9p: fix race condition on rdma->state in trans_rdma.c The rdma->state field is modified without holding req_lock in both recv_done() and p9_cm_event_handler(), while rdma_request() accesses the same field under the req_lock spinlock. This inconsistent locking creates a race condition: - recv_done() running in softirq completion context sets rdma->state = P9_RDMA_FLUSHING without acquiring req_lock - p9_cm_event_handler() modifies rdma->state at multiple points (ADDR_RESOLVED, ROUTE_RESOLVED, ESTABLISHED, CLOSED) without req_lock - rdma_request() uses spin_lock_irqsave(&rdma->req_lock, flags) to protect the read-modify-write of rdma->state The race can cause lost state transitions: recv_done() or the CM event handler could set state to FLUSHING/CLOSED while rdma_request() is concurrently checking or modifying state under the lock, leading to the FLUSHING transition being silently overwritten by CLOSING. This corrupts the connection state machine and can cause use-after-free on RDMA request objects during teardown. Fix by adding req_lock protection to all rdma->state modifications in recv_done() and p9_cm_event_handler(), matching the pattern already used in rdma_request(). Use spin_lock_irqsave/spin_unlock_irqrestore in the CM event handler since it can race with recv_done() which runs in softirq context. Tested with a kernel module that races two threads (simulating rdma_request and recv_done/CM handler) on rdma->state with proper locking: 5.5M+ FLUSHING writes over 27M iterations with 0 lost transitions.

Gravité et risque d'exploitation

CVE-2026-72491 obtient un score CVSS de 9.8/10, soit une gravité critique. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.72 %, ce qui la place devant 53.2 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 7.1.5, <8aadc136d8e8d8fc95d7982d213cfe2234dfcf2b, <=6.12.*, 6.18.40, <151f8cf5b23d8a534d884432a82a6d54d5a61989, 4.20, 9e69c673fe077b8dc491cd8406c9bdcb1f76dee2, 0, <=7.1.*, <4.10, 4.14.132, <4.20, <7d54894a1ee265a72d70f7cae1da6cc774cccc71, 6.1.178, <=5.10.*, <3970a19a80de530b801b6256354d4a529a9a2d6c, <=6.6.*, 6.12.97, <4.5, 4.19.57, <=6.18.*, c01ddaa54d7411e964ffd250c018d8469c5852f2, 5.15.212, 6.6.145, 5.10.261, 4.4.185, <13bf9879b778b2f4b260b45bed18f31806120d1e, <ebbcbe5c0db215feecc17def06178da443f4eea6, e48e7e27e4dfd00c81e0381e7cee610cce021452, <=*, <=5.15.*, 3479b3c35e82ed10aa0ca2ee9e78c4eded06ba62, 4.9.185, <4.15, 473c7dd1d7b59ff8f88a5154737e3eac78a96e5b, 7.2, <5424138848eb7d7d8a7196676e90a2cbf2142454, <4cee2b8766045059d5e0b8114837b4a8efe827ac) 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