{"cve":"CVE-2021-47001","nvd":{"published":"2024-02-28T09:15:38.213","modified":"2026-08-04T10:16:40.920","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nxprtrdma: Fix cwnd update ordering\n\nAfter a reconnect, the reply handler is opening the cwnd (and thus\nenabling more RPC Calls to be sent) /before/ rpcrdma_post_recvs()\ncan post enough Receive WRs to receive their replies. This causes an\nRNR and the new connection is lost immediately.\n\nThe race is most clearly exposed when KASAN and disconnect injection\nare enabled. This slows down rpcrdma_rep_create() enough to allow\nthe send side to post a bunch of RPC Calls before the Receive\ncompletion handler can invoke ib_post_recv().","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H","score":4.7},"cwes":[],"references":["https://git.kernel.org/stable/c/19b5fa9489b5706bc878c3a522a7f771079e2fa0","https://git.kernel.org/stable/c/35d8b10a25884050bb3b0149b62c3818ec59f77c","https://git.kernel.org/stable/c/8834ecb5df22b7ff3c9b0deba7726579bb613f95","https://git.kernel.org/stable/c/eddae8be7944096419c2ae29477a45f767d0fcd4","https://git.kernel.org/stable/c/19b5fa9489b5706bc878c3a522a7f771079e2fa0"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:45:59.823092188+00:00"},"epss":{"cve":"CVE-2021-47001","score":0.00749,"percentile":0.54951,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}