{"id":"CVE-2026-23437","summary":"net: shaper: protect late read accesses to the hierarchy","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: shaper: protect late read accesses to the hierarchy\n\nWe look up a netdev during prep of Netlink ops (pre- callbacks)\nand take a ref to it. Then later in the body of the callback\nwe take its lock or RCU which are the actual protections.\n\nThis is not proper, a conversion from a ref to a locked netdev\nmust include a liveness check (a check if the netdev hasn't been\nunregistered already). Fix the read cases (those under RCU).\nWrites needs a separate change to protect from creating the\nhierarchy after flush has already run.","modified":"2026-07-15T01:49:20.110342823Z","published":"2026-04-03T15:15:22.048Z","related":["SUSE-SU-2026:21519-1","SUSE-SU-2026:21520-1","SUSE-SU-2026:21521-1","SUSE-SU-2026:21522-1","SUSE-SU-2026:21523-1","SUSE-SU-2026:21524-1","SUSE-SU-2026:21525-1","SUSE-SU-2026:21526-1","SUSE-SU-2026:21527-1","SUSE-SU-2026:21528-1","SUSE-SU-2026:21529-1","SUSE-SU-2026:21530-1","SUSE-SU-2026:21531-1","SUSE-SU-2026:21532-1","SUSE-SU-2026:21533-1","SUSE-SU-2026:21554-1","SUSE-SU-2026:21555-1","SUSE-SU-2026:21556-1","SUSE-SU-2026:21557-1","SUSE-SU-2026:21558-1","SUSE-SU-2026:21562-1","SUSE-SU-2026:21563-1","SUSE-SU-2026:21591-1","SUSE-SU-2026:21598-1","SUSE-SU-2026:21834-1","SUSE-SU-2026:21841-1","SUSE-SU-2026:21845-1","SUSE-SU-2026:21860-1","SUSE-SU-2026:21953-1","SUSE-SU-2026:21954-1","SUSE-SU-2026:21961-1","SUSE-SU-2026:21964-1","SUSE-SU-2026:21968-1","SUSE-SU-2026:21973-1","SUSE-SU-2026:21975-1","SUSE-SU-2026:21978-1","SUSE-SU-2026:22029-1","SUSE-SU-2026:22034-1","SUSE-SU-2026:22036-1","SUSE-SU-2026:22037-1","openSUSE-SU-2026:20826-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23437.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0f9ea7141f365b4f27226898e62220fb98ef8dc6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/348758ba74e6a348299965b16a97cfb817545cc0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/581eee0890a8bde44f1fb78ad3e70502a897d583"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23437.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23437"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4b623f9f0f59652ea71fcb27d60b4c3b65126dbb"},{"fixed":"581eee0890a8bde44f1fb78ad3e70502a897d583"},{"fixed":"348758ba74e6a348299965b16a97cfb817545cc0"},{"fixed":"0f9ea7141f365b4f27226898e62220fb98ef8dc6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23437.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.20"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23437.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"}]}