{"id":"CVE-2023-4207","details":"A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation.\n\nWhen fw_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.\n\nWe recommend upgrading past commit 76e42ae831991c828cffa8c37736ebfb831ad5ec.","modified":"2026-03-15T22:47:24.878476Z","published":"2023-09-06T14:15:11.453Z","related":["ALSA-2023:7077"],"references":[{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html"},{"type":"ADVISORY","url":"https://www.debian.org/security/2023/dsa-5492"},{"type":"FIX","url":"https://kernel.dance/76e42ae831991c828cffa8c37736ebfb831ad5ec"},{"type":"FIX","url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=76e42ae831991c828cffa8c37736ebfb831ad5ec"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-4207.json","unresolved_ranges":[{"events":[{"introduced":"3.18"},{"fixed":"4.14.326"}]},{"events":[{"introduced":"4.15"},{"fixed":"4.19.295"}]},{"events":[{"introduced":"4.20"},{"fixed":"5.4.253"}]},{"events":[{"introduced":"5.5"},{"fixed":"5.10.190"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.15.126"}]},{"events":[{"introduced":"5.16"},{"fixed":"6.1.45"}]},{"events":[{"introduced":"6.2"},{"fixed":"6.4.10"}]},{"events":[{"introduced":"0"},{"last_affected":"12.0"}]}]}}],"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"}]}