{"id":"AZL-58965","summary":"CVE-2025-21703 affecting package kernel for versions less than 5.15.180.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetem: Update sch-\u003eq.qlen before qdisc_tree_reduce_backlog()\n\nqdisc_tree_reduce_backlog() notifies parent qdisc only if child\nqdisc becomes empty, therefore we need to reduce the backlog of the\nchild qdisc before calling it. Otherwise it would miss the opportunity\nto call cops-\u003eqlen_notify(), in the case of DRR, it resulted in UAF\nsince DRR uses -\u003eqlen_notify() to maintain its active list.","modified":"2026-04-21T04:37:10.803733Z","published":"2025-02-18T15:15:18Z","upstream":["CVE-2025-21703"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-21703"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:2","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.180.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-58965.json"}}],"schema_version":"1.7.5"}