Heimdall Security Logo

CVE-2026-68335

Vulnérabilité élevée dans Linux (Linux)

CVSS 7.8 · Élevée
EPSS 0.1%
Linux•Linux•Versions : <=6.1.*, <=6.12.*, 6.12.101, <1e2e2d9806944fe485824d617c8b7c78116c22db, c827073c95fde388bc65fe5227f944eaf859b9f0, 0, <=7.1.*, c809195f5523dd4d09403bbb1c9732d548aa0d1e, 5.15.216, <5521ae71e32a8069ed4ca6e792179dc57bc43ab2, <=5.10.*, <=6.6.*, 6.18.42, 7.1.6, 6.1.183, <03c574112e5d066df0ddce36d7438e850bcf3050, <=6.18.*, <9591042533140dfe6608d9344806d567dcd39d02, <cfb3ce07b705e486e022a2f2b1242b48f13981ff, <4.18, 4.18, <=*, 4.17.19, <=5.15.*, <abff41fd928328bbf3dda1140beb2e61fa424ccd, <742ff6f02545212e991cd8b45011e40d2c2ef25a, 5.10.265, 6.6.148, 7.2, <0f8690e3869109cd5803ccb400889d20a0b54e0e

Description

In the Linux kernel, the following vulnerability has been resolved: rds: drop incoming messages that cross network namespace boundaries rds_find_bound() looks up the destination socket using a global rhashtable keyed solely on (addr, port, scope_id). Network namespaces are not part of the key, so a sender in netns A can deliver an incoming message (inc) to a socket that lives in a different netns B. When this happens, inc->i_conn points to an rds_connection whose c_net is netns A, but the receiving rs lives in netns B. Once the child process that created netns A exits, cleanup_net() calls rds_loop_exit_net() -> rds_loop_kill_conns() -> rds_conn_destroy(), freeing that connection. If the survivor socket in netns B still holds the inc, any subsequent dereference of inc->i_conn is a use-after-free. There are two dangerous sites in rds_clear_recv_queue(): 1. inc->i_conn->c_lcong (offset 88 of freed rds_connection, size 200) read via rds_recv_rcvbuf_delta() -- confirmed by KASAN. 2. inc->i_conn->c_trans->inc_free(inc) (function pointer at offset 80) called via rds_inc_put() when the inc refcount reaches zero -- same race window, potential call-through-freed-object primitive. The bug is reachable from unprivileged user namespaces (CLONE_NEWUSER + CLONE_NEWNET), available since Linux 3.8. Fix this by rejecting the delivery in rds_recv_incoming() when the socket returned by rds_find_bound() belongs to a different network namespace than the connection that carried the message. Use the existing rds_conn_net() / sock_net() helpers and net_eq() for the comparison.

Gravité et risque d'exploitation

CVE-2026-68335 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 0.14 %, ce qui la place devant 2.6 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <=6.12.*, 6.12.101, <1e2e2d9806944fe485824d617c8b7c78116c22db, c827073c95fde388bc65fe5227f944eaf859b9f0, 0, <=7.1.*, c809195f5523dd4d09403bbb1c9732d548aa0d1e, 5.15.216, <5521ae71e32a8069ed4ca6e792179dc57bc43ab2, <=5.10.*, <=6.6.*, 6.18.42, 7.1.6, 6.1.183, <03c574112e5d066df0ddce36d7438e850bcf3050, <=6.18.*, <9591042533140dfe6608d9344806d567dcd39d02, <cfb3ce07b705e486e022a2f2b1242b48f13981ff, <4.18, 4.18, <=*, 4.17.19, <=5.15.*, <abff41fd928328bbf3dda1140beb2e61fa424ccd, <742ff6f02545212e991cd8b45011e40d2c2ef25a, 5.10.265, 6.6.148, 7.2, <0f8690e3869109cd5803ccb400889d20a0b54e0e) 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