{"id":"CVE-2026-89784","revision":"83a263a2b0b24a94a3e320bf03c2beae","records":[{"revision":"83a263a2b0b24a94a3e320bf03c2beae","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89784","aliases":[],"title":"SUNRPC: check rpc_sockaddr2uaddr() return value in rpcb_register_inet4/6","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: check rpc_sockaddr2uaddr() return value in rpcb_register_inet4/6\n\nrpcb_register_inet4() and rpcb_register_inet6() store the result of\nrpc_sockaddr2uaddr() into map->r_addr without checking it for NULL.\nrpc_sockaddr2uaddr() returns NULL when its final kstrdup() fails, and\nthe unchecked NULL is then carried into the synchronous RPCBPROC_SET\nencode path: rpcb_register_call() -> rpc_call_sync() ->\nrpcb_enc_getaddr() -> encode_rpcb_string(), whose first statement is\nstrlen(string), dereferencing NULL and oopsing the kernel.\n\nThe crash reproduces under failslab on v6.12; with KASAN the NULL\ndereference surfaces as a fault on the shadow of address zero:\n\n Oops: general protection fault, probably for non-canonical address\n       0xdffffc0000000000 [#1] PREEMPT SMP KASAN\n RIP: 0010:strlen (lib/string.c:409)\n Call Trace:\n  encode_rpcb_string (net/sunrpc/rpcb_clnt.c:890)\n  rpcb_enc_getaddr (net/sunrpc/rpcb_clnt.c:910)\n  rpcauth_wrap_req_encode (net/sunrpc/auth.c:745)\n  call_encode (net/sunrpc/clnt.c:1966)\n  __rpc_execute (net/sunrpc/sched.c:952)\n  rpc_run_task (net/sunrpc/clnt.c:1243)\n  rpc_call_sync (net/sunrpc/clnt.c:1272)\n  rpcb_v4_register (net/sunrpc/rpcb_clnt.c:500)\n  svc_generic_rpcbind_set\n  nfsd_rpcbind_set\n  svc_register\n  svc_setup_socket\n  svc_addsock\n  write_ports\n  nfsctl_transaction_write\n  vfs_write\n\nThe crash is reachable when an in-kernel RPC service (nfsd, lockd,\nnfs-callback) registers with the local rpcbind under enough memory\npressure for the small GFP_KERNEL kstrdup() in rpc_sockaddr2uaddr() to\nfail. The asynchronous getport path already handles this exact failure\nmode by returning -ENOMEM; only the two register helpers omit the check.\n\nMirror that handling: bail out with -ENOMEM when rpc_sockaddr2uaddr()\nreturns NULL, before the address is fed into the encoder.","state":0,"publishedAt":"2026-09-16T08:48:22.404+00:00","modifiedAt":"2026-10-19T08:52:36.983+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sunrpc/rpcb_clnt.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"d77385f23830ee6c400569bac8b37e6eb3b7d360\",\n                            \"lessThan\": \"04441b792ec40eb66349b5fab34b6a2090b5b2dd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d77385f23830ee6c400569bac8b37e6eb3b7d360\",\n                            \"lessThan\": \"5a51c49ddb37b883566874aecc66bc5a2e617a96\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d77385f23830ee6c400569bac8b37e6eb3b7d360\",\n                            \"lessThan\": \"4a6095de8cb1858e05bdf70b3e7d6d7645c25041\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d77385f23830ee6c400569bac8b37e6eb3b7d360\",\n                            \"lessThan\": \"12bf3e0182ccdaf3b412756a756d3944a7dacaa9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d77385f23830ee6c400569bac8b37e6eb3b7d360\",\n                            \"lessThan\": \"4e01022974355732e748ec8ebc97c558cb624ffe\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d77385f23830ee6c400569bac8b37e6eb3b7d360\",\n                            \"lessThan\": \"cda4aacfb0bbf5c0f90fd0b42c72c749635d1368\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d77385f23830ee6c400569bac8b37e6eb3b7d360\",\n                            \"lessThan\": \"eb476289c12cc22c8766f8a84eeb7ab46c4e8fb6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d77385f23830ee6c400569bac8b37e6eb3b7d360\",\n                            \"lessThan\": \"fd22370226a0d8109045d0831fd5aaadee921693\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sunrpc/rpcb_clnt.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"3.2\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"3.2\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89784","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89784","identifiers":["CVE-2026-89784"]},"retained":false,"historicalAffected":[]}],"coverage":[]}