{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72170",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72170"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "9p: skip nlink update in cacheless mode to fix WARN_ON",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\n9p: skip nlink update in cacheless mode to fix WARN_ON\n\nv9fs_dec_count() unconditionally calls drop_nlink() on regular files,\neven when the inode's nlink is already zero. In cacheless mode the\nclient refetches inode metadata from the server (the source of truth)\non every operation, so by the time v9fs_remove() returns, the locally\ncached nlink may already reflect the post-unlink value:\n\n  1. Client initiates unlink, server processes it and sets nlink to 0\n  2. Client refetches inode metadata (nlink=0) before unlink returns\n  3. Client's v9fs_remove() completes successfully\n  4. Client calls v9fs_dec_count() which calls drop_nlink() on nlink=0\n\nThis race is easily triggered under heavy unlink workloads, such as\nstress-ng's unlink stressor, producing the following warning:\n\n  WARNING: fs/inode.c:417 at drop_nlink+0x4c/0xc8\n  Call trace:\n   drop_nlink+0x4c/0xc8\n   v9fs_remove+0x1e0/0x250 [9p]\n   v9fs_vfs_unlink+0x20/0x38 [9p]\n   vfs_unlink+0x13c/0x258\n   ...\n\nIn cacheless mode the server is authoritative and the inode is on its\nway out, so locally adjusting nlink buys nothing. Skip v9fs_dec_count()\nentirely when neither CACHE_META nor CACHE_LOOSE is set, which both\navoids the warning and removes a class of nlink races (two concurrent\nunlinkers observing nlink > 0 and both calling drop_nlink()) that an\nnlink == 0 guard alone would only narrow rather than close.",
  "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-2026-72170"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6086469f7d469549bfd070348b717a6e43736200"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ab257019cb72f467b55c95384d99c94e3908b928"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4ec4ebe40c82cb4c60756732f6593055d010c59c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a5a682b016ef5b5384e28f6d652d47a8f8e73d37"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/de79c3f3643841b8659a71958df7cf2a66bfd409"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8d610017c992de705b304d3d727a6e3a86af6149"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8faccac11e1369adddf5d80f4a45af93f13b2e1a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/574aa0b4799470ac814479f1138d19efe6262255"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-23T12:46:35Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Triggered via unlink/rmdir/rename syscalls on a mounted 9p client filesystem (default cacheless mode). Common in QEMU/KVM virtio-9p guest shares and TCP-mounted exports; requires code execution on the client host, not direct remote packet delivery to this kernel path.\nAC:L - The fix commit states the race is easily triggered under heavy unlink workloads (e.g., stress-ng). An attacker can drive concurrent unlinks or getattr/unlink on the same inode to refresh server nlink=0 before drop_nlink(), controlling both sides of the race.\nPR:L - Exploitation requires only normal filesystem write permission on the 9p export (may_delete_dentry/inode_permission on the parent directory). Guest users on virtio-9p shares or tenants with write access do not need root/CAP_SYS_ADMIN beyond using an already-mounted filesystem.\nUI:N - No victim interaction is required beyond the attacker (or compromised local process) issuing unlink/rmdir/rename on paths they can already write; mounting 9p is an admin setup step, not per-exploit user action.\nS:U - The bug corrupts inode metadata in the 9p client kernel on the same host as the attacker process. It does not cross VM/host, container/host, or IOMMU security boundaries; virtio-9p guest triggers affect the guest kernel only.\nC:H - drop_nlink() on i_nlink==0 emits WARN_ON then underflows the unsigned link counter to UINT_MAX, corrupting kernel inode metadata. Per kernel CVSS guidance, memory/metadata corruption that could be leveraged for further exploitation warrants High confidentiality.\nI:H - Unsigned i_nlink underflow corrupts inode lifecycle accounting, preventing correct removal tracking (s_remove_count) and desynchronizing dentry unlink from inode state. This class of VFS inode corruption can enable further integrity violations and is scored High when uncertain.\nA:H - Each hit triggers kernel WARN_ON (easily spammed for denial-of-service via log flooding, and fatal where panic_on_warn is enabled) and leaves inodes with bogus nlink values that can provoke subsequent kernel faults during VFS operations on affected files."
    }
  }
}