{"cve":"CVE-2021-47179","nvd":{"published":"2024-03-25T10:15:09.317","modified":"2026-08-04T10:16:50.673","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return()\n\nCommit de144ff4234f changes _pnfs_return_layout() to call\npnfs_mark_matching_lsegs_return() passing NULL as the struct\npnfs_layout_range argument. Unfortunately,\npnfs_mark_matching_lsegs_return() doesn't check if we have a value here\nbefore dereferencing it, causing an oops.\n\nI'm able to hit this crash consistently when running connectathon basic\ntests on NFS v4.1/v4.2 against Ontap.","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":["CWE-476"],"references":["https://git.kernel.org/stable/c/39785761feadf261bc5101372b0b0bbaf6a94494","https://git.kernel.org/stable/c/42637ca25c7d7b5a92804a679af5192e8c1a9f48","https://git.kernel.org/stable/c/4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42","https://git.kernel.org/stable/c/a421d218603ffa822a0b8045055c03eae394a7eb","https://git.kernel.org/stable/c/aba3c7795f51717ae316f3566442dee7cc3eeccb"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:47:51.568503435+00:00"},"epss":{"cve":"CVE-2021-47179","score":0.00676,"percentile":0.52243,"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."]}