GHSA-CC2X-2XG8-9RPF

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

SUNRPC: auth_gss: fix memory leaks in XDR decoding error paths

The gssx_dec_ctx(), gssx_dec_status(), and gssx_dec_name() functions allocate memory via gssx_dec_buffer(), which calls kmemdup(). When a subsequent decode operation fails, these functions return immediately without freeing previously allocated buffers, causing memory leaks.

The leak in gssx_dec_ctx() is particularly relevant because the caller (gssp_accept_sec_context_upcall) initializes several buffer length fields to non-zero values, resulting in memory allocation:

struct gssx_ctx rctxh = {
    .exported_context_token.len = GSSX_max_output_handle_sz,
    .mech.len = GSS_OID_MAX_LEN,
    .src_name.display_name.len = GSSX_max_princ_sz,
    .targ_name.display_name.len = GSSX_max_princ_sz
};

If, for example, gssx_dec_name() succeeds for src_name but fails for targ_name, the memory allocated for exported_context_token, mech, and src_name.display_name remains unreferenced and cannot be reclaimed.

Add error handling with goto-based cleanup to free any previously allocated buffers before returning an error.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-45870"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:00Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nSUNRPC: auth_gss: fix memory leaks in XDR decoding error paths\n\nThe gssx_dec_ctx(), gssx_dec_status(), and gssx_dec_name()\nfunctions allocate memory via gssx_dec_buffer(), which calls\nkmemdup(). When a subsequent decode operation fails, these\nfunctions return immediately without freeing previously\nallocated buffers, causing memory leaks.\n\nThe leak in gssx_dec_ctx() is particularly relevant because\nthe caller (gssp_accept_sec_context_upcall) initializes several\nbuffer length fields to non-zero values, resulting in memory\nallocation:\n\n    struct gssx_ctx rctxh = {\n        .exported_context_token.len = GSSX_max_output_handle_sz,\n        .mech.len = GSS_OID_MAX_LEN,\n        .src_name.display_name.len = GSSX_max_princ_sz,\n        .targ_name.display_name.len = GSSX_max_princ_sz\n    };\n\nIf, for example, gssx_dec_name() succeeds for src_name but\nfails for targ_name, the memory allocated for\nexported_context_token, mech, and src_name.display_name\nremains unreferenced and cannot be reclaimed.\n\nAdd error handling with goto-based cleanup to free any\npreviously allocated buffers before returning an error.",
  "id": "GHSA-cc2x-2xg8-9rpf",
  "modified": "2026-05-27T15:33:14Z",
  "published": "2026-05-27T15:33:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45870"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3b56eb90feb8a3709417f5624f3871847d42bcb1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3e6397b056335cc56ef0e9da36c95946a19f5118"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/64303b92d94c0c7845a273acd8d84b796d6f1db7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b4af3806846778799cd4ab0766dc18341e777264"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c81431b1b9fbd21e9a5a9211b5517b7295d18e6a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/caf7eff432e91a9eba1c79fa545c2f54be15d62b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d79b9097a6a2b91471b40755f1225364be5d85ff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/df10f23defff22c8d55fe6db74f6e4ce927145bf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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