GHSA-W9C6-3CWC-M3Q4
Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-17 18:32In the Linux kernel, the following vulnerability has been resolved:
RDMA/core: Fix potential use after free in counter_release()
When accessing a counter via the netlink path the only synchronization mechanism for the said counter is rdma_restrack_get(). Currently, rdma_restrack_del() is invoked at the end of counter_release(), which is too late, since by that point vendor-specific resources associated with the counter might already be freed. This can leave a short window where the counter remains accessible through restrack, leading to a potential use-after-free.
Fix this by moving the rdma_restrack_del() call to be before the freeing of the vendor-specific resources, ensuring that the counter is removed from restrack before its internal resources are released. This guarantees that no new users hold references to a counter that is in the process of destruction.
{
"affected": [],
"aliases": [
"CVE-2026-92509"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-17T17:17:53Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Fix potential use after free in counter_release()\n\nWhen accessing a counter via the netlink path the only synchronization\nmechanism for the said counter is rdma_restrack_get().\nCurrently, rdma_restrack_del() is invoked at the end of\ncounter_release(), which is too late, since by that point\nvendor-specific resources associated with the counter might already be\nfreed. This can leave a short window where the counter remains\naccessible through restrack, leading to a potential use-after-free.\n\nFix this by moving the rdma_restrack_del() call to be before the\nfreeing of the vendor-specific resources, ensuring that the counter is\nremoved from restrack before its internal resources are released.\nThis guarantees that no new users hold references to a counter that is\nin the process of destruction.",
"id": "GHSA-w9c6-3cwc-m3q4",
"modified": "2026-09-17T18:32:07Z",
"published": "2026-09-17T18:32:07Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-92509"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/235ef2d0e750885c29340b0fc40620a7a4f52e12"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2f0c6705e26ba92c0c6b0b0908a2d3f35a039d5b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5eb0c57a8b568eb08f464861d84d518a2af939ac"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/64c72390d8407ea86de712a477c796b07d37abc4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8c013e3a8d8273da4d47bf1c27f016a3551996f5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d5cc211e8c39e46f357d30a092d683e84d560de9"
}
],
"schema_version": "1.4.0",
"severity": []
}
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