{"cve":"CVE-2021-46913","nvd":{"published":"2024-02-27T07:15:07.770","modified":"2026-08-04T10:16:36.373","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nftables: clone set element expression template\n\nmemcpy() breaks when using connlimit in set elements. Use\nnft_expr_clone() to initialize the connlimit expression list, otherwise\nconnlimit garbage collector crashes when walking on the list head copy.\n\n[  493.064656] Workqueue: events_power_efficient nft_rhash_gc [nf_tables]\n[  493.064685] RIP: 0010:find_or_evict+0x5a/0x90 [nf_conncount]\n[  493.064694] Code: 2b 43 40 83 f8 01 77 0d 48 c7 c0 f5 ff ff ff 44 39 63 3c 75 df 83 6d 18 01 48 8b 43 08 48 89 de 48 8b 13 48 8b 3d ee 2f 00 00 <48> 89 42 08 48 89 10 48 b8 00 01 00 00 00 00 ad de 48 89 03 48 83\n[  493.064699] RSP: 0018:ffffc90000417dc0 EFLAGS: 00010297\n[  493.064704] RAX: 0000000000000000 RBX: ffff888134f38410 RCX: 0000000000000000\n[  493.064708] RDX: 0000000000000000 RSI: ffff888134f38410 RDI: ffff888100060cc0\n[  493.064711] RBP: ffff88812ce594a8 R08: ffff888134f38438 R09: 00000000ebb9025c\n[  493.064714] R10: ffffffff8219f838 R11: 0000000000000017 R12: 0000000000000001\n[  493.064718] R13: ffffffff82146740 R14: ffff888134f38410 R15: 0000000000000000\n[  493.064721] FS:  0000000000000000(0000) GS:ffff88840e440000(0000) knlGS:0000000000000000\n[  493.064725] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  493.064729] CR2: 0000000000000008 CR3: 00000001330aa002 CR4: 00000000001706e0\n[  493.064733] Call Trace:\n[  493.064737]  nf_conncount_gc_list+0x8f/0x150 [nf_conncount]\n[  493.064746]  nft_rhash_gc+0x106/0x390 [nf_tables]","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/47d8de3c226574a3ddb8b87d0c152028d1bafef4","https://git.kernel.org/stable/c/4d8f9065830e526c83199186c5f56a6514f457d2","https://git.kernel.org/stable/c/e51ff3ffc316377cca21de8b80404eed0c37b3c3","https://git.kernel.org/stable/c/47d8de3c226574a3ddb8b87d0c152028d1bafef4","https://git.kernel.org/stable/c/4d8f9065830e526c83199186c5f56a6514f457d2"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:45:59.823092188+00:00"},"epss":{"cve":"CVE-2021-46913","score":0.00243,"percentile":0.15589,"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."]}