{"cve":"CVE-2024-49974","nvd":{"published":"2024-10-21T18:15:18.227","modified":"2026-06-17T08:00:51.540","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFSD: Limit the number of concurrent async COPY operations\n\nNothing appears to limit the number of concurrent async COPY\noperations that clients can start. In addition, AFAICT each async\nCOPY can copy an unlimited number of 4MB chunks, so can run for a\nlong time. Thus IMO async COPY can become a DoS vector.\n\nAdd a restriction mechanism that bounds the number of concurrent\nbackground COPY operations. Start simple and try to be fair -- this\npatch implements a per-namespace limit.\n\nAn async COPY request that occurs while this limit is exceeded gets\nNFS4ERR_DELAY. The requesting client can choose to send the request\nagain after a delay or fall back to a traditional read/write style\ncopy.\n\nIf there is need to make the mechanism more sophisticated, we can\nvisit that in future patches.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/43e46ee5efc03990b223f7aa8b77aa9c3d3acfdf","https://git.kernel.org/stable/c/6a488ad7745b8f64625c6d3a24ce7e448e83f11b","https://git.kernel.org/stable/c/7ea9260874b779637aff6d24c344b8ef4ac862a0","https://git.kernel.org/stable/c/9e52ff544e0bfa09ee339fd7b0937ee3c080c24e","https://git.kernel.org/stable/c/aadc3bbea163b6caaaebfdd2b6c4667fbc726752"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:56:33.105311382+00:00"},"epss":{"cve":"CVE-2024-49974","score":0.00275,"percentile":0.19899,"date":"2026-11-01"},"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."]}