{"cve":"CVE-2021-47541","nvd":{"published":"2024-05-24T15:15:18.330","modified":"2026-08-04T10:17:07.950","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources()\n\nIn mlx4_en_try_alloc_resources(), mlx4_en_copy_priv() is called and\ntmp->tx_cq will be freed on the error path of mlx4_en_copy_priv().\nAfter that mlx4_en_alloc_resources() is called and there is a dereference\nof &tmp->tx_cq[t][i] in mlx4_en_alloc_resources(), which could lead to\na use after free problem on failure of mlx4_en_copy_priv().\n\nFix this bug by adding a check of mlx4_en_copy_priv()\n\nThis bug was found by a static analyzer. The analysis employs\ndifferential checking to identify inconsistent security operations\n(e.g., checks or kfrees) between two code paths and confirms that the\ninconsistent operations are not recovered in the current function or\nthe callers, so they constitute bugs.\n\nNote that, as a bug found by static analysis, it can be a false\npositive or hard to trigger. Multiple researchers have cross-reviewed\nthe bug.\n\nBuilds with CONFIG_MLX4_EN=m show no new warnings,\nand our static analyzer no longer warns about this code.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-416"],"references":["https://git.kernel.org/stable/c/676dc7d9b15bf8733233a2db1ec3f9091ab34275","https://git.kernel.org/stable/c/75917372eef0dbfb290ae45474314d35f97aea18","https://git.kernel.org/stable/c/addad7643142f500080417dd7272f49b7a185570","https://git.kernel.org/stable/c/be12572c5ddc8ad7453bada4eec8fa46967dc757","https://git.kernel.org/stable/c/e461a9816a1ac5b4aeb61621b817225b61e46a68"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:50:30.954589733+00:00"},"epss":{"cve":"CVE-2021-47541","score":0.00295,"percentile":0.22142,"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."]}