GHSA-79R3-V437-QVQG
Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32In the Linux kernel, the following vulnerability has been resolved:
nfsd: check client ownership when cancelling a copy-notify stateid
On the OFFLOAD_CANCEL path (clp != NULL), manage_cpntf_state() freed the target cpntf state without checking ownership. The lookup key st->si_opaque.so_id is allocated cyclically (guessable) and the embedded clientid is the fixed per-net nn->s2s_cp_cl_id, so any authenticated NFSv4.2 client could cancel and free another client's copy-notify stateid.
Compare the creating clientid recorded in state->cp_p_clid against the requesting client's cl_clientid and return nfserr_bad_stateid on a mismatch instead of freeing the entry.
{
"affected": [],
"aliases": [
"CVE-2026-89694"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-11T20:19:56Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: check client ownership when cancelling a copy-notify stateid\n\nOn the OFFLOAD_CANCEL path (clp != NULL), manage_cpntf_state() freed the\ntarget cpntf state without checking ownership. The lookup key\nst-\u003esi_opaque.so_id is allocated cyclically (guessable) and the embedded\nclientid is the fixed per-net nn-\u003es2s_cp_cl_id, so any authenticated\nNFSv4.2 client could cancel and free another client\u0027s copy-notify\nstateid.\n\nCompare the creating clientid recorded in state-\u003ecp_p_clid against the\nrequesting client\u0027s cl_clientid and return nfserr_bad_stateid on a\nmismatch instead of freeing the entry.",
"id": "GHSA-79r3-v437-qvqg",
"modified": "2026-09-14T15:32:33Z",
"published": "2026-09-11T21:31:37Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89694"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6bba72b8ee68ad631b94bd439592cba46de54d7d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6bdbfab96e0cf25e5f57dac5c09dc1749751a4bf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/75268f6cfe26b09a7e4d3216367e87fe9e2a26aa"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/81b2cfe767943922eca906a2a5af23a0ce5d0f35"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/88daaed26e17e1c7e851859b5bbb4f0e1ab6d0e9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b1eca07303594ca27f5dc360a6946bd7e1f5b04c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b42dc26a14b4ad5d6daaada11ec4c70744141c25"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d801906165cb5cc250d5cbe44935594e170be3e2"
}
],
"schema_version": "1.4.0",
"severity": []
}
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