{"id":"CVE-2026-89798","title":"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's callback in rn->rn_don…","summary":"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's callback in rn->rn_don…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 7e86845a0346efc95fddaa97ce5cd6a8bda8c71c < 3c97b8e76ca2bba9e8770571413aed694068e78e","Linux >= 7e86845a0346efc95fddaa97ce5cd6a8bda8c71c < ea0408273ccf5df1fb52d9a1b9db4d31600dcb36","Linux >= 7e86845a0346efc95fddaa97ce5cd6a8bda8c71c < 5b06f706374c37375bdff9d21cc10e61df925a92","Linux 6.11"],"published":"2026-09-16","updated":"2026-09-21","sourceUpdated":"2026-09-21T14:17:26.890","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89798","references":[{"url":"https://git.kernel.org/stable/c/3c97b8e76ca2bba9e8770571413aed694068e78e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5b06f706374c37375bdff9d21cc10e61df925a92","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ea0408273ccf5df1fb52d9a1b9db4d31600dcb36","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f9fe3cad43c42d874a388583552b39b411d886eb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00198,"epssPercentile":0.09815,"ingestedAt":"2026-09-16T10:53:54.009Z","slug":"CVE-2026-89798","body":"## Overview\n\nIn 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's callback in rn->rn_done. The xarray makes @rn\nreachable to rpcrdma_remove_one(), which walks rd_xa and invokes\nrn->rn_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->rn_done before xa_alloc() publishes @rn. The xarray's\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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}