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CVE-2026-64115

Vulnérabilité élevée dans Linux (Linux)

CVSS 8.8 · Élevée
EPSS 0.1%
Linux•Linux•Versions : <1dd531e28f61edd286edc486ab068f135b5ae1eb, <9fe74e42914c851d68069713b7b917a9c33faf26, <=6.1.*, d021c344051af91f42c5ba9fdedc176740cbd238, <=6.12.*, <=7.0.*, 0, <47e63077605c6c2aa45b3df9847a8cdc1f1f6ef9, <3.9, 5.15.209, 6.12.92, 6.6.142, <=5.10.*, <=6.6.*, 6.1.175, <1e19f08552b90070ed18bafb1763c78297823af6, <99e22ddf4edb63dc8382bc028af928056d3450cf, 6.18.34, <440447699c681e26ed58e9c309cad718270a18b4, 7.1, <=6.18.*, 7.0.11, 5.10.258, <ecda37f8faab3220da199335e42564cb7a9ad145, <=*, <=5.15.*, <cc27e989a5dfdfcfc1cca7c3be27a0c7532b46cb, 3.9

Description

In the Linux kernel, the following vulnerability has been resolved: vsock/vmci: fix UAF when peer resets connection during handshake vmci_transport_recv_connecting_server() returned err = 0 for a peer RST in its default switch arm: err = pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST ? 0 : -EINVAL; That made vmci_transport_recv_listen() skip vsock_remove_pending(), leaving the pending socket on the listener's pending_links with sk_state = TCP_CLOSE while destroy: still dropped the explicit reference taken before schedule_delayed_work(). One second later vsock_pending_work() observed is_pending=true and performed full cleanup: vsock_remove_pending() then the two trailing sock_put(sk) calls -- the first reached refcount 0 and __sk_freed the socket, and the second wrote into the freed object: BUG: KASAN: slab-use-after-free in refcount_warn_saturate Write of size 4 at addr ffff88800b1cac80 by task kworker Workqueue: events vsock_pending_work Treat peer RST like any other unexpected packet type (err = -EINVAL). All destroy: arms now return err < 0, so vmci_transport_recv_listen() removes pending from pending_links synchronously and vsock_pending_work() takes the is_pending=false / !rejected branch, dropping only its own work reference. This also closes the multi-packet race Sashiko reported on v2: pending is removed from the list before any subsequent packet can find it. The pre-existing sk_acceptq_removed() gap on the err < 0 path of vmci_transport_recv_listen() that Sashiko also noted is not introduced or changed by this patch. Tested on lts-6.12.79 with KASAN: 52/100 unpatched -> 0/100 patched.

Gravité et risque d'exploitation

CVE-2026-64115 obtient un score CVSS de 8.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.14 %, ce qui la place devant 2.6 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <1dd531e28f61edd286edc486ab068f135b5ae1eb, <9fe74e42914c851d68069713b7b917a9c33faf26, <=6.1.*, d021c344051af91f42c5ba9fdedc176740cbd238, <=6.12.*, <=7.0.*, 0, <47e63077605c6c2aa45b3df9847a8cdc1f1f6ef9, <3.9, 5.15.209, 6.12.92, 6.6.142, <=5.10.*, <=6.6.*, 6.1.175, <1e19f08552b90070ed18bafb1763c78297823af6, <99e22ddf4edb63dc8382bc028af928056d3450cf, 6.18.34, <440447699c681e26ed58e9c309cad718270a18b4, 7.1, <=6.18.*, 7.0.11, 5.10.258, <ecda37f8faab3220da199335e42564cb7a9ad145, <=*, <=5.15.*, <cc27e989a5dfdfcfc1cca7c3be27a0c7532b46cb, 3.9) 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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