{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "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-\u003er_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() -\u003e rpc_call_sync() -\u003e rpcb_enc_getaddr() -\u003e 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.",
  "id": "DEBIAN-CVE-2026-89784",
  "modified": "2026-09-17T04:47:39.522358826Z",
  "published": "2026-09-16T09:17:09.060Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-89784"
    }
  ],
  "upstream": [
    "CVE-2026-89784"
  ]
}