CVE-2026-89784

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/04441b792ec40eb66349b5fab34b6a2090b5b2dd
• https://git.kernel.org/stable/c/5a51c49ddb37b883566874aecc66bc5a2e617a96
• https://git.kernel.org/stable/c/4a6095de8cb1858e05bdf70b3e7d6d7645c25041
• https://git.kernel.org/stable/c/12bf3e0182ccdaf3b412756a756d3944a7dacaa9
• https://git.kernel.org/stable/c/4e01022974355732e748ec8ebc97c558cb624ffe
• https://git.kernel.org/stable/c/cda4aacfb0bbf5c0f90fd0b42c72c749635d1368
• https://git.kernel.org/stable/c/eb476289c12cc22c8766f8a84eeb7ab46c4e8fb6
• https://git.kernel.org/stable/c/fd22370226a0d8109045d0831fd5aaadee921693

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