{"id":"CVE-2021-47520","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncan: pch_can: pch_can_rx_normal: fix use after free\n\nAfter calling netif_receive_skb(skb), dereferencing skb is unsafe.\nEspecially, the can_frame cf which aliases skb memory is dereferenced\njust after the call netif_receive_skb(skb).\n\nReordering the lines solves the issue.","modified":"2026-03-13T05:19:27.125501Z","published":"2024-05-24T15:15:14.003Z","related":["SUSE-SU-2024:2008-1","SUSE-SU-2024:2011-1","SUSE-SU-2024:2019-1","SUSE-SU-2024:2189-1","SUSE-SU-2024:2190-1","SUSE-SU-2024:2493-1","SUSE-SU-2024:2561-1","SUSE-SU-2024:2893-1","SUSE-SU-2024:2895-1","SUSE-SU-2024:2901-1","SUSE-SU-2024:2923-1","SUSE-SU-2024:2948-1"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/94cddf1e9227a171b27292509d59691819c458db"},{"type":"FIX","url":"https://git.kernel.org/stable/c/abb4eff3dcd2e583060082a18a8dbf31f02689d4"},{"type":"FIX","url":"https://git.kernel.org/stable/c/affbad02bf80380a7403885b9fe4a1587d1bb4f3"},{"type":"FIX","url":"https://git.kernel.org/stable/c/bafe343a885c70dddf358379cf0b2a1c07355d8d"},{"type":"FIX","url":"https://git.kernel.org/stable/c/3a3c46e2eff0577454860a203be1a8295f4acb76"},{"type":"FIX","url":"https://git.kernel.org/stable/c/3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa"},{"type":"FIX","url":"https://git.kernel.org/stable/c/6c73fc931658d8cbc8a1714b326cb31eb71d16a7"},{"type":"FIX","url":"https://git.kernel.org/stable/c/703dde112021c93d6e89443c070e7dbd4dea612e"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"2.6.37"},{"fixed":"4.4.295"}]},{"events":[{"introduced":"4.5"},{"fixed":"4.9.293"}]},{"events":[{"introduced":"4.10"},{"fixed":"4.14.258"}]},{"events":[{"introduced":"4.15"},{"fixed":"4.19.221"}]},{"events":[{"introduced":"4.20"},{"fixed":"5.4.165"}]},{"events":[{"introduced":"5.5"},{"fixed":"5.10.85"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.15.8"}]}],"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47520.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:H/I:H/A:H"}]}