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CVE-2026-89784

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <4a6095de8cb1858e05bdf70b3e7d6d7645c25041, <3.2, <=6.12.*, <cda4aacfb0bbf5c0f90fd0b42c72c749635d1368, 5.15.221, 5.10.270, 0, <12bf3e0182ccdaf3b412756a756d3944a7dacaa9, 6.1.188, <04441b792ec40eb66349b5fab34b6a2090b5b2dd, 6.18.52, <=5.10.*, <=6.6.*, <eb476289c12cc22c8766f8a84eeb7ab46c4e8fb6, 6.6.157, <fd22370226a0d8109045d0831fd5aaadee921693, <5a51c49ddb37b883566874aecc66bc5a2e617a96, 7.2.6, <=6.18.*, 3.2, 6.12.110, <=7.2.*, <=*, <=5.15.*, d77385f23830ee6c400569bac8b37e6eb3b7d360, <4e01022974355732e748ec8ebc97c558cb624ffe, 7.3

Description

In the Linux kernel, the following vulnerability has been resolved: SUNRPC: check rpc_sockaddr2uaddr() return value in rpcb_register_inet4/6 rpcb_register_inet4() and rpcb_register_inet6() store the result of rpc_sockaddr2uaddr() into map->r_addr without checking it for NULL. rpc_sockaddr2uaddr() returns NULL when its final kstrdup() fails, and the unchecked NULL is then carried into the synchronous RPCBPROC_SET encode path: rpcb_register_call() -> rpc_call_sync() -> rpcb_enc_getaddr() -> encode_rpcb_string(), whose first statement is strlen(string), dereferencing NULL and oopsing the kernel. The crash reproduces under failslab on v6.12; with KASAN the NULL dereference surfaces as a fault on the shadow of address zero: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000 [#1] PREEMPT SMP KASAN RIP: 0010:strlen (lib/string.c:409) Call Trace: encode_rpcb_string (net/sunrpc/rpcb_clnt.c:890) rpcb_enc_getaddr (net/sunrpc/rpcb_clnt.c:910) rpcauth_wrap_req_encode (net/sunrpc/auth.c:745) call_encode (net/sunrpc/clnt.c:1966) __rpc_execute (net/sunrpc/sched.c:952) rpc_run_task (net/sunrpc/clnt.c:1243) rpc_call_sync (net/sunrpc/clnt.c:1272) rpcb_v4_register (net/sunrpc/rpcb_clnt.c:500) svc_generic_rpcbind_set nfsd_rpcbind_set svc_register svc_setup_socket svc_addsock write_ports nfsctl_transaction_write vfs_write The crash is reachable when an in-kernel RPC service (nfsd, lockd, nfs-callback) registers with the local rpcbind under enough memory pressure for the small GFP_KERNEL kstrdup() in rpc_sockaddr2uaddr() to fail. The asynchronous getport path already handles this exact failure mode by returning -ENOMEM; only the two register helpers omit the check. Mirror that handling: bail out with -ENOMEM when rpc_sockaddr2uaddr() returns NULL, before the address is fed into the encoder.

Gravité et risque d'exploitation

CVE-2026-89784 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 0.21 %, ce qui la place devant 10.6 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <4a6095de8cb1858e05bdf70b3e7d6d7645c25041, <3.2, <=6.12.*, <cda4aacfb0bbf5c0f90fd0b42c72c749635d1368, 5.15.221, 5.10.270, 0, <12bf3e0182ccdaf3b412756a756d3944a7dacaa9, 6.1.188, <04441b792ec40eb66349b5fab34b6a2090b5b2dd, 6.18.52, <=5.10.*, <=6.6.*, <eb476289c12cc22c8766f8a84eeb7ab46c4e8fb6, 6.6.157, <fd22370226a0d8109045d0831fd5aaadee921693, <5a51c49ddb37b883566874aecc66bc5a2e617a96, 7.2.6, <=6.18.*, 3.2, 6.12.110, <=7.2.*, <=*, <=5.15.*, d77385f23830ee6c400569bac8b37e6eb3b7d360, <4e01022974355732e748ec8ebc97c558cb624ffe, 7.3) 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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