{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74730",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74730"
  ],
  "published": "2026-08-22T15:32:12Z",
  "summary": "NFS: Pin the 'struct nfs_server' during a FREE_STATEID call",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFS: Pin the 'struct nfs_server' during a FREE_STATEID call\n\nDan Aloni reports that he was able to hit a use-after-free bug if a\nFREE_STATEID operation gets delayed for whatever reason. Fix this by\nbumping the refcount of the 'struct nfs_server' object for the duration\nof the FREE_STATEID so it doesn't get cleaned up from underneath us\nwhile operations are still in flight.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "upstream_fixed": "6.18.45"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74730"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ed2f92ce2fc48463c41e0e540b9a3454889e8af8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d858ab09e787106432d4d9830bad9dfedf02f890"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/af62f1af182d33a0de38308c012841885d8ab92e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/caee6a68ffaa5016dfc01cd0b3dc1896a32e3abd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ed1161ab6239761958b38d5667225634fc2be894"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d71dfffa512e71b166a889484e4c3b148a9a3af2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/80ed3d762628b36c9e4b22fac7c65b72ef3b13dd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cf616096a0f3a2b60f7d68b6b39674a6867ded9c"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-25T05:42:41Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The bug is in the NFSv4 client FREE_STATEID path: nfs41_free_stateid_prepare/done/release use a freed struct nfs_server while handling async RPC completions driven by NFSv4 replies from the mounted server and by server-initiated CB_RECALL/CB_RECALLANY callbacks on the NFS backchannel.\nAC:L - The attacker controls both sides of the race: they provoke FREE_STATEID via revocation responses or callbacks, keep it in flight with NFS4ERR_DELAY, and time nfs_server teardown via user-mount umount, automount idle expiry, or the concurrent stateid cleanup that runs during umount itself.\nPR:N - A malicious or compromised NFSv4 server needs no account or elevated capability on the victim client once an NFSv4.1+ mount exists; FREE_STATEID is issued automatically during server-driven stateid revocation handling without any client-side privileges at exploit time.\nUI:N - After an NFS mount exists (boot-time, autofs, or Kubernetes volumes are common), no further victim action is needed: the attacker drives recall/revocation on the wire and mount teardown follows from automated autofs expiry or attacker-controlled umount on a user-mounted export.\nS:U - The use-after-free corrupts kernel heap within the NFS client on the same host; it is a standard kernel memory-safety bug, not a VM escape, container breakout, or IOMMU/DMA boundary crossing.\nC:H - Freed struct nfs_server objects are kmalloc'd and callbacks dereference nfs_client, rpc_clnt, and super_block fields after nfs_free_server/call_rcu, giving a classic UAF read primitive over attacker-influenced heap contents including function pointers.\nI:H - UAF on struct nfs_server exposes destroy hooks, RPC client handles, and client/session state pointers that an attacker can reschedule via heap grooming, yielding write and control-flow primitives typical of NFS client heap corruption bugs.\nA:H - Use of a freed nfs_server in RPC prepare/done/release paths causes kernel oops or panic; Dan Aloni demonstrated reliable reproduction, and UAFs in this path crash hosts even when not fully weaponized."
    }
  }
}