{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-68343",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-68343"
  ],
  "published": "2026-08-10T12:08:00Z",
  "summary": "smb: client: validate DFS referral PathConsumed",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: validate DFS referral PathConsumed\n\nparse_dfs_referrals() validates that the response contains the fixed\nreferral entry array and, on for-next, the per-referral string offsets.\nHowever, the response also contains a PathConsumed value that is later\nused for DFS path parsing.\n\nIf a malformed response provides a PathConsumed value larger than the\nsearch name, later DFS parsing can advance beyond the end of the path.\n\nValidate PathConsumed against the search name length before storing it in\nthe parsed referral.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
    }
  ],
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      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-68343"
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bfebe5110fd135d86d65a0a346e14c106b02028b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5b439f39f33ec15d319ced3b025e122346fba987"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/285bd4a5f3f156aa5869843b47a1b1380b774241"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2fdd6d196c656b376cc251e1e9ff110b3ed522e1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9f88a99ed511651b2dc2177d6854b2d1b8322e75"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f6f5ee2aa33b350c671721b965251c42cebb962e"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-19T16:47:12Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.1,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - The tainted PathConsumed value comes directly from a GET_DFS_REFERRAL response received over TCP/445 from the SMB server, so a malicious or MITM-positioned server on the network fully controls the input to the vulnerable code.\nAC:L - The server simply sets an oversized PathConsumed (up to 65535, and it can also clear the SMB1 UNICODE flag to select the completely unvalidated branch); the resulting out-of-bounds walk past the path buffer is deterministic and needs no race or memory-layout luck.\nPR:N - The attacker is the remote server (or a MITM on an unsigned connection) and needs no account or privilege on the victim client; the client parses the referral response as part of establishing the connection.\nUI:N - DFS referral walks are performed automatically by autofs/systemd automounts, fstab mounts at boot and reconnect-driven remounts, so a forged referral can be delivered without any user action.\nS:U - The out-of-bounds access stays within the kernel's own memory and mount context on the client; no VM, IOMMU or sandbox boundary is crossed.\nC:H - prepath = full_path + path_consumed points past the end of the heap path string, and cifs_build_devname() strlen()s and copies from there, splicing adjacent kernel heap contents (up to ~64KB away) into the constructed UNC/prefixpath that is then observable via the mount source and /proc/mounts.\nI:N - The defect is purely an out-of-bounds read; all subsequent allocations and copies are sized from the same over-read string, so no kernel memory is written or corrupted.\nA:H - With PathConsumed up to 65535 the pointer can run far past a small slab object into an unmapped or guarded page, so strlen() on it oopses the mounting task (and panics on panic_on_oops systems)."
    }
  }
}