GHSA-RF2C-8WJW-Q46F
Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-21 15:31In the Linux kernel, the following vulnerability has been resolved:
rpcrdma: arm rn_done before publishing the notification
rpcrdma_rn_register() inserts @rn into rd_xa with xa_alloc() before storing the caller's callback in rn->rn_done. The xarray makes @rn reachable to rpcrdma_remove_one(), which walks rd_xa and invokes rn->rn_done(rn) for every registered notification. A device removal that races a fresh registration can therefore observe @rn with rn_done still NULL, because the notification objects are zero allocated by their owners, and call through a NULL function pointer.
Store rn->rn_done before xa_alloc() publishes @rn. The xarray's store-side and load-side ordering then guarantees that any CPU which finds @rn in rd_xa also observes the armed callback.
rpcrdma_rn_unregister() treats a non-NULL rn_done as the sentinel for a completed registration, so the early store must not survive a failed registration. Clear rn_done again when xa_alloc() fails. Were it left set, the failed-accept cleanup path would call rpcrdma_rn_unregister() on an @rn that was never inserted, erasing an unrelated rd_xa slot and underflowing rd_kref.
{
"affected": [],
"aliases": [
"CVE-2026-89798"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-16T11:16:44Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrpcrdma: arm rn_done before publishing the notification\n\nrpcrdma_rn_register() inserts @rn into rd_xa with xa_alloc() before\nstoring the caller\u0027s callback in rn-\u003ern_done. The xarray makes @rn\nreachable to rpcrdma_remove_one(), which walks rd_xa and invokes\nrn-\u003ern_done(rn) for every registered notification. A device removal\nthat races a fresh registration can therefore observe @rn with\nrn_done still NULL, because the notification objects are zero\nallocated by their owners, and call through a NULL function pointer.\n\nStore rn-\u003ern_done before xa_alloc() publishes @rn. The xarray\u0027s\nstore-side and load-side ordering then guarantees that any CPU which\nfinds @rn in rd_xa also observes the armed callback.\n\nrpcrdma_rn_unregister() treats a non-NULL rn_done as the sentinel\nfor a completed registration, so the early store must not survive a\nfailed registration. Clear rn_done again when xa_alloc() fails.\nWere it left set, the failed-accept cleanup path would call\nrpcrdma_rn_unregister() on an @rn that was never inserted, erasing\nan unrelated rd_xa slot and underflowing rd_kref.",
"id": "GHSA-rf2c-8wjw-q46f",
"modified": "2026-09-21T15:31:42Z",
"published": "2026-09-16T12:30:36Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89798"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3c97b8e76ca2bba9e8770571413aed694068e78e"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5b06f706374c37375bdff9d21cc10e61df925a92"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ea0408273ccf5df1fb52d9a1b9db4d31600dcb36"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f9fe3cad43c42d874a388583552b39b411d886eb"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
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