{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89707",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89707"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "nfsd: release path refs on follow_down() error",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: release path refs on follow_down() error\n\nnfsd_cross_mnt() initializes a local struct path with mntget() and\ndget() before calling follow_down(). On a negative return the error\narm jumps to out without releasing those references:\n\n    err = follow_down(&path, follow_flags);\n    if (err < 0)\n            goto out;\n\nfollow_down() never drops the caller's entry-time refs on any error\nsub-case; for example a pre-cross d_manage() failure leaves path\nuntouched, so the mntget()/dget() taken on entry survive the call.\n\nEvery other early-exit arm in nfsd_cross_mnt() (other-namespace\nreturn, IS_ERR(exp2), and the success tail after the swap) already\ncalls path_put(&path); the err < 0 arm is the lone omission. The\nleak inflates mnt_count and d_count on each failed cross-mount,\nblocking umount and pinning dentries against the shrinker, and is\nreachable by any authenticated NFS client through nfsd_lookup_dentry\nor the NFSv4 READDIR encode path.\n\nFix by calling path_put(&path) before the goto out in the err < 0\narm so the entry-time refs are released on all follow_down() error\nreturns.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
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            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89707"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/085cfde7c2186acaad103f02d2c25435ad5224e9"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/194316df81263519156ebe714c4a286bee00e5be"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/467d56fd3ff57447a790c6dc3ede2d02a947d224"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2bc4343308d85ee4e0dd3877b384306c96f114c2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6cba08dc1922140d260cfeb30bbda4ee1bf869d8"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - nfsd_cross_mnt() runs in the in-kernel NFS server on TCP/UDP 2049 from nfsd_lookup_dentry() (NFSv2/v3/v4 LOOKUP) and nfsd4_encode_entry4_fattr() (NFSv4 READDIR); a remote client reaches it with ordinary RPC requests.\nAC:L - On a typical nfsd export of autofs homes or nested mounts with crossmnt, an attacker can deterministically make follow_down() fail (autofs d_manage/automount error) by repeating LOOKUP/READDIR of failing mount triggers; no race or victim-controlled layout is required.\nPR:N - Default nfsd exports accept RPC_AUTH_NULL and RPC_AUTH_UNIX with no password; fh_verify only checks export IP policy, a MOUNT/PUTROOTFH filehandle, and directory execute, so no Linux account or capability on the server is required.\nUI:N - The attacker triggers the leak with their own NFS LOOKUP or READDIR RPCs; no victim mount, click, or other interactive action is required.\nS:U - The leak inflates dentry and vfsmount refcounts inside the nfsd host kernel and does not cross a VM, IOMMU, or other separate security authority.\nC:N - The bug only fails to path_put() the mntget/dget taken before follow_down(); it does not read kernel or file data or provide an information-disclosure primitive.\nI:N - The bug does not write attacker-controlled data or corrupt kernel objects; it only retains extra references on existing dentries and mounts.\nA:H - Each failed follow_down() permanently pins the dentry and vfsmount; repeated LOOKUPs of distinct autofs/mountpoint names leave unreclaimable dentries, block umount, and can exhaust kernel memory for a system-wide DoS."
    }
  }
}