{"cve":"CVE-2021-47244","nvd":{"published":"2024-05-21T15:15:13.477","modified":"2026-08-04T10:16:54.543","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: Fix out of bounds when parsing TCP options\n\nThe TCP option parser in mptcp (mptcp_get_options) could read one byte\nout of bounds. When the length is 1, the execution flow gets into the\nloop, reads one byte of the opcode, and if the opcode is neither\nTCPOPT_EOL nor TCPOPT_NOP, it reads one more byte, which exceeds the\nlength of 1.\n\nThis fix is inspired by commit 9609dad263f8 (\"ipv4: tcp_input: fix stack\nout of bounds when parsing TCP options.\").","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H","score":8.2},"cwes":["CWE-125"],"references":["https://git.kernel.org/stable/c/07718be265680dcf496347d475ce1a5442f55ad7","https://git.kernel.org/stable/c/73eeba71dc9932970befa009e68272a3d5ec4a58","https://git.kernel.org/stable/c/76e02b8905d0691e89e104a882f3bba7dd0f6037","https://git.kernel.org/stable/c/07718be265680dcf496347d475ce1a5442f55ad7","https://git.kernel.org/stable/c/73eeba71dc9932970befa009e68272a3d5ec4a58"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:50:30.954589733+00:00"},"epss":{"cve":"CVE-2021-47244","score":0.00719,"percentile":0.53907,"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."]}