{"id":"CVE-2021-47179","details":"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.","modified":"2026-03-13T05:20:36.754731Z","published":"2024-03-25T10:15:09.317Z","related":["SUSE-SU-2024:1454-1","SUSE-SU-2024:1465-1","SUSE-SU-2024:1489-1","SUSE-SU-2024:1643-1","SUSE-SU-2024:1646-1","SUSE-SU-2024:1870-1"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/4e1ba532dbc1a0e19fc2458d74ab8d98680c4e42"},{"type":"FIX","url":"https://git.kernel.org/stable/c/a421d218603ffa822a0b8045055c03eae394a7eb"},{"type":"FIX","url":"https://git.kernel.org/stable/c/aba3c7795f51717ae316f3566442dee7cc3eeccb"},{"type":"FIX","url":"https://git.kernel.org/stable/c/b090d110e66636bca473fd8b98d5c97b555a965a"},{"type":"FIX","url":"https://git.kernel.org/stable/c/f9890652185b72b8de9ebeb4406037640b6e1b53"},{"type":"FIX","url":"https://git.kernel.org/stable/c/39785761feadf261bc5101372b0b0bbaf6a94494"},{"type":"FIX","url":"https://git.kernel.org/stable/c/42637ca25c7d7b5a92804a679af5192e8c1a9f48"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"4.9.269"},{"fixed":"4.9.271"}]},{"events":[{"introduced":"4.14.233"},{"fixed":"4.14.235"}]},{"events":[{"introduced":"4.19.191"},{"fixed":"4.19.193"}]},{"events":[{"introduced":"5.4.118"},{"fixed":"5.4.124"}]},{"events":[{"introduced":"5.10.36"},{"fixed":"5.10.42"}]},{"events":[{"introduced":"5.12.3"},{"fixed":"5.12.9"}]}],"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47179.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}