GHSA-CC2X-2XG8-9RPF
Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-06-25 21:31In 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.
{
"affected": [],
"aliases": [
"CVE-2026-45870"
],
"database_specific": {
"cwe_ids": [
"CWE-401"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-27T14:17:00Z",
"severity": "MODERATE"
},
"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": "2026-06-25T21:31:19Z",
"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": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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