{"id":"CVE-2026-53079","summary":"net_sched: fix skb memory leak in deferred qdisc drops","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: fix skb memory leak in deferred qdisc drops\n\nWhen the network stack cleans up the deferred list via qdisc_run_end(),\nit operates on the root qdisc. If the root qdisc do not implement the\nTCQ_F_DEQUEUE_DROPS flag the packets queue to free are never freed and\ngets stranded on the child's local to_free list.\n\nFix this by making qdisc_dequeue_drop() aware of the root qdisc. It\nfetches the root qdisc and check for the TCQ_F_DEQUEUE_DROPS flag. If\nthe flag is present, the packet is appended directly to the root's\nto_free list. Otherwise, drop it directly as it was done before the\noptimization was implemented.","modified":"2026-07-16T03:32:31.510387596Z","published":"2026-06-24T16:30:20.163Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53079.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/a6bd339dbb3514bce690fdcf252e788dfab4ee76"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bf26ad92ffda7884825d67b46bd5efe615c3babf"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53079.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53079"},{"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":"a6efc273ab8245722eee2150fa12cf75781dc410"},{"fixed":"bf26ad92ffda7884825d67b46bd5efe615c3babf"},{"fixed":"a6bd339dbb3514bce690fdcf252e788dfab4ee76"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-53079.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-53079.json"}}],"schema_version":"1.7.5"}