{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-72356",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-72356"
  ],
  "published": "2026-08-15T06:04:33Z",
  "summary": "cifs: Fix missing credit release on failure in cifs_issue_read()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: Fix missing credit release on failure in cifs_issue_read()\n\nFix missing release of credits in the failure path in cifs_issue_read()\nlest retrying the subreq just overwrites the credits value.",
  "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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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-72356"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b9ee1f0347bf56d019ca28ddff090234bb45b05c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/86652704a7fd41a5a8459027e08640bbd1952826"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3a303f985c6bec8787c2ad4a16b39c14c5bcd765"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c16b8c4cfb4fe2244cc33e469a93c1ab8684146b"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:50:24Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - The bug is in the CIFS/SMB client read path reached over TCP/445 when netfs issues reads; a malicious or compromised remote SMB server can provoke replayable async_readv failures (-EAGAIN/-ECONNABORTED) after credits are reserved, matching prior client-side CIFS credit CVEs scored as Network.\nAC:L - The remote server controls both sides of the retry: it can reset the connection or force reconnects to return replayable errors, and netfs reissues the same subrequest deterministically; no race or memory-layout condition outside attacker control is required.\nPR:N - The attacker is the remote SMB peer and needs no account, credentials, or local privileges on the victim; exploitation occurs during normal read/writeback I/O on an already-established CIFS mount (fstab, autofs, Azure Files, enterprise NAS).\nUI:N - Once a CIFS mount exists, the server triggers the flaw by its responses to client-initiated reads with no further victim interaction; mounting is a deployment precondition, not an action required at exploit time per kernel CNA convention for client filesystem bugs.\nS:U - Impact is confined to SMB credit/in_flight accounting and I/O scheduling within the client kernel; it does not cross VM, IOMMU, or sandbox security boundaries.\nC:N - The flaw leaks SMB protocol credits and misaccounts counters; it does not read or disclose kernel memory, user data, or pointers, and provides no information-disclosure primitive.\nI:N - No memory corruption, type confusion, or arbitrary write occurs; the only effect is permanently losing credits from the server pool when a failed read subrequest is retried without releasing them first.\nA:H - Each leaked credit permanently depletes server->credits; repeated retries exhaust the pool until smb2_wait_mtu_credits blocks all CIFS I/O on that connection in uninterruptible waits, causing system-wide hang/DoS for processes using the mount."
    }
  }
}