Heimdall Security Logo

CVE-2026-97476

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <64ca5839916176c3451f61a2c7178033423c67d7, <=6.1.*, <=6.12.*, <8b04dda272c30d46834bb03dd2895b08c090483b, 6.18.53, 0, <c96a5209dda666004b8ee1ed7f0d493d09a4f200, 5.10.271, 6.6.158, <=5.10.*, 2.6.30, <=6.6.*, 6.1.189, <c4081e49ebe0e3160c4b70ec7639494792dee206, <2.6.30, <f05142d0eeaa6e8227511c88e10a2b8fe7a78fc4, <=6.18.*, 5.15.222, 639b321b4d8f4e412bfbb2a4a19bfebc1e68ace4, <=*, <=5.15.*, <65fae4b42269dbea7e3842ae4dd0786162c6248e, 7.2, 6.12.111, <093f172296d32499ffac7809629b206178776eb6

Description

In the Linux kernel, the following vulnerability has been resolved: rds: filter RDS_INFO_* getsockopt by caller's netns The RDS_INFO_* family of getsockopt(2) options reads several file-scope global lists that are not per-netns: rds_sock_info / rds6_sock_info, rds_sock_inc_info / rds6_sock_inc_info -> rds_sock_list rds_tcp_tc_info / rds6_tcp_tc_info -> rds_tcp_tc_list rds_conn_info / rds6_conn_info, rds_conn_message_info_cmn (for the *_SEND_MESSAGES and *_RETRANS_MESSAGES variants), rds_for_each_conn_info (for RDS_INFO_IB_CONNECTIONS) -> rds_conn_hash[] The handlers do not filter by the caller's network namespace. rds_info_getsockopt() has no netns or capable() check, and rds_create() has no capable() check, so AF_RDS is reachable from an unprivileged user namespace. As a result, an unprivileged caller in a fresh user_ns plus netns can read the bound address and sock inode of every RDS socket on the host, the peer address of incoming messages on every RDS socket on the host, the peer address and TCP sequence numbers of every rds-tcp connection on the host, and the peer address and RDS sequence numbers of every RDS connection on the host. The rds-tcp transport is reachable from a non-initial netns (see rds_set_transport()), so a one-shot init_net gate at rds_info_getsockopt() would deny legitimate per-netns visibility to rds-tcp callers. Instead, filter at each handler by comparing the netns of the caller's socket to the netns of the list entry, or to rds_conn_net(conn) for connection paths. Only copy entries whose netns matches the caller. Counters (RDS_INFO_COUNTERS) are aggregate statistics and remain global. Reproducer (KASAN VM, rds and rds_tcp loaded): an AF_RDS socket binds 127.0.0.1:4242 in init_net as root. A child process enters a fresh user_ns plus netns and opens AF_RDS there, then calls getsockopt(SOL_RDS, RDS_INFO_SOCKETS). Before this change, the child sees the init_net socket. After this change, the child sees zero entries. Drop the rds_sock_count, rds_tcp_tc_count, and rds6_tcp_tc_count globals. v2 used them for the size precheck and lens->nr; v3 replaced the precheck with a per-ns count from a first pass over the list, so the globals have no remaining readers. The matching increments and decrements in rds_create()/rds_destroy_sock() and rds_tcp_set_callbacks()/rds_tcp_restore_callbacks() go away with them. Reported by the kernel test robot under clang W=1.

Gravité et risque d'exploitation

CVE-2026-97476 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 0.17 %, ce qui la place devant 6.3 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <64ca5839916176c3451f61a2c7178033423c67d7, <=6.1.*, <=6.12.*, <8b04dda272c30d46834bb03dd2895b08c090483b, 6.18.53, 0, <c96a5209dda666004b8ee1ed7f0d493d09a4f200, 5.10.271, 6.6.158, <=5.10.*, 2.6.30, <=6.6.*, 6.1.189, <c4081e49ebe0e3160c4b70ec7639494792dee206, <2.6.30, <f05142d0eeaa6e8227511c88e10a2b8fe7a78fc4, <=6.18.*, 5.15.222, 639b321b4d8f4e412bfbb2a4a19bfebc1e68ace4, <=*, <=5.15.*, <65fae4b42269dbea7e3842ae4dd0786162c6248e, 7.2, 6.12.111, <093f172296d32499ffac7809629b206178776eb6) 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