{"id":"CVE-2026-72036","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-72036","summary":"net/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked\n\nmultiq_dequeue() takes a packet from a band's child with a direct\n->dequeue() call after multiq_peek() peeked it. When the child is\nnon-work-conserving the peek stashes the skb in the child's gso_skb, so\nthe direct dequeue returns a different skb and orphans the stash,\ndesyncing the child's qlen/backlog. With a qfq child reached through a\npeeking parent (e.g. tbf) this re-enters the child on an emptied list and\ndereferences NULL, panicking the kernel from softirq on ordinary egress.\n\nTake the packet through qdisc_dequeue_peeked(), as sch_prio already does\nand as sch_red and sch_sfb were just fixed to do. The helper is a no-op\nwhen the child has no stash, so a work-conserving child is unaffected.","published":"2026-08-15T05:51:57.012Z","modified":"2026-08-18T03:56:19.268215358Z","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"5.10.261"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1b9cc255e8089606b92b2adf504e334573682821"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/54f6b0c843e228d499eb4b6bbb89df68cad9ad5d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5889064919a1e5c0a9469c54895000414fc46944"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7a5a1582710981ef6637de9f074a60a5b1d63222"},{"type":"WEB","url":"https://git.kernel.org/stable/c/86a61e46a1919e8abf4d227c204773dabb24068a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eb1a9637f0bd84b5db8803af65dfb1f44785406f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fffeb2ab5eeb823d4c2330571a098f63237c9049"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72036.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72036"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T03:56:19.268215358Z"}}