GHSA-PFQ2-9RM7-2X65
Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-11 21:31In the Linux kernel, the following vulnerability has been resolved:
RDMA/uverbs: Add UVERBS_ATTR_UHW to UVERBS_METHOD_REG_MR
The original commit missed that three drivers (mthca, irdma, siw) have UHW data associated with reg_mr that cannot be passed through the ioctl. They also assume that the udata cannot be NULL, so failing to pass a valid udata can trigger a NULL udata crash in those drivers.
This never happens in real systems since in rdma-core ibv_cmd_reg_mr_ex() does not accept a udata and those three drivers don't use it, however a malicious userspace could trigger it.
{
"affected": [],
"aliases": [
"CVE-2026-89506"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-11T20:19:32Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/uverbs: Add UVERBS_ATTR_UHW to UVERBS_METHOD_REG_MR\n\nThe original commit missed that three drivers (mthca, irdma, siw) have UHW\ndata associated with reg_mr that cannot be passed through the ioctl. They\nalso assume that the udata cannot be NULL, so failing to pass a valid\nudata can trigger a NULL udata crash in those drivers.\n\nThis never happens in real systems since in rdma-core ibv_cmd_reg_mr_ex()\ndoes not accept a udata and those three drivers don\u0027t use it, however a\nmalicious userspace could trigger it.",
"id": "GHSA-pfq2-9rm7-2x65",
"modified": "2026-09-11T21:31:29Z",
"published": "2026-09-11T21:31:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89506"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/011199f46f44a9fd93a9e5ab5d7fd1328d80e9bf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/71d5c41ac583df09a7c32199bef7d42de7267d07"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9e71d0f4944ba5641e01db29b3256c963656d671"
}
],
"schema_version": "1.4.0",
"severity": []
}
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