{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89545",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89545"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "sunrpc: defer rq_argp and rq_resp free until after RCU grace period",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: defer rq_argp and rq_resp free until after RCU grace period\n\nsvc_rqst_free() frees rqstp->rq_argp and rqstp->rq_resp synchronously\nvia kfree(), but defers the rqstp struct free via kfree_rcu().  After\nsvc_exit_thread() calls list_del_rcu() and svc_rqst_free(), there is\na window where RCU readers that started before list_del_rcu() can still\ntraverse the thread list and find the rqstp.  These readers (e.g.\nnfsd_nl_rpc_status_get_dumpit()) dereference rqstp->rq_argp, which has\nalready been freed \u2014 a use-after-free.\n\nFix this by moving the kfree of rq_argp and rq_resp into an explicit\ncall_rcu() callback alongside the struct free.  Resources not accessed\nby RCU readers (bvec, buffer pages, scratch folio, auth_data) remain\nsynchronously freed.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89545"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0ea49d69aa806008b2424c8cf21cf746b9963967"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/08bc49e0541260bf294962cf889a32a2d2713ad6"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c479bde671cbe2f9e152834a8b0eb7c3c295bbaf"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-21T13:30:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The use-after-free is reached by NFSD_CMD_RPC_STATUS_GET, a generic-netlink dump over AF_NETLINK that walks svc_rqst threads and reads rq_argp; remote NFS RPCs never enter nfsd_nl_rpc_status_get_dumpit().\nAC:L - The attacker fully controls the dumpit reader and can loop it while nfsd threads exit (dynamic idle-timeout kills or thread-count changes), and can further churn threads with NFS traffic; this is an attacker-driven RCU race, not a condition beyond their control.\nPR:L - NFSD_CMD_RPC_STATUS_GET is registered with GENL_CMD_CAP_DUMP and no GENL_ADMIN_PERM, so any unprivileged process in the nfsd network namespace can invoke the dump; exploiting it does not require CAP_NET_ADMIN or root.\nUI:N - The attacker issues the netlink dump themselves; no separate victim action such as mounting a filesystem or opening a device is required.\nS:U - This is a kernel-heap use-after-free in sunrpc/nfsd on the local host; impact stays inside the kernel's security authority and does not cross a VM, IOMMU, or other security boundary.\nC:H - dumpit dereferences the kfree'd rq_argp (nfsd4_compoundargs) and reads opcnt/opnums under rcu_read_lock; a kernel UAF with heap reuse of that object yields an arbitrary read primitive.\nI:H - The same slab UAF is heap-sprayable so a replaced rq_argp can make dumpit walk attacker-controlled args->ops[], enabling kernel memory corruption and control-flow hijacking.\nA:H - Use-after-free of rq_argp while an RCU reader still holds the svc_rqst from sp_all_threads can oops or panic the kernel even if the UAF is not fully turned into code execution."
    }
  }
}