GHSA-G8R2-WJ85-RQ7Q
Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-09-14 12:31In the Linux kernel, the following vulnerability has been resolved:
RDMA/nldev: Fix locking when accessing mr->pd
Sashiko points out that, due to rereg_mr, the PD is actually variable and all the touches in nldev are racy.
Use mr->device instead of mr->pd->device.
Getting the PD restrack ID is more tricky. To avoid disturbing all the happy paths, add an rdma_restrack_sync() operation which is sort of like flush_workqueue() or synchronize_irq(): after it returns, all the old nldev touches to the mr are gone and everything sees the new PD. This makes it safe to reach into the PD pointer.
{
"affected": [],
"aliases": [
"CVE-2026-74334"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-15T06:22:34Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/nldev: Fix locking when accessing mr-\u003epd\n\nSashiko points out that, due to rereg_mr, the PD is actually variable and\nall the touches in nldev are racy.\n\nUse mr-\u003edevice instead of mr-\u003epd-\u003edevice.\n\nGetting the PD restrack ID is more tricky. To avoid disturbing all the\nhappy paths, add an rdma_restrack_sync() operation which is sort of like\nflush_workqueue() or synchronize_irq(): after it returns, all the old\nnldev touches to the mr are gone and everything sees the new PD. This\nmakes it safe to reach into the PD pointer.",
"id": "GHSA-g8r2-wj85-rq7q",
"modified": "2026-09-14T12:31:32Z",
"published": "2026-08-15T06:32:30Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74334"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/05e26f34597e9c38bb5b340d86b179b23673869f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1a132ee4e655288d9a0937ea5109a0d038431ae9"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/50d5c02ab8e62325548bd3a6e6b758a9dcd6e7c3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7a0cbb5721a1da81e902d73b6049f85ca8f3fc0a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/845c6b355226195dad1f26b300c4830f57034e8b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a07cba1296aaa81bf9b914486ca957aaff196247"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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