{"id":"CVE-2026-72036","title":"net/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked","summary":"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() cal…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a","Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < eb1a9637f0bd84b5db8803af65dfb1f44785406f","Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 7a5a1582710981ef6637de9f074a60a5b1d63222","Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 86a61e46a1919e8abf4d227c204773dabb24068a","Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 1b9cc255e8089606b92b2adf504e334573682821","Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 5889064919a1e5c0a9469c54895000414fc46944","Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < fffeb2ab5eeb823d4c2330571a098f63237c9049","Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 54f6b0c843e228d499eb4b6bbb89df68cad9ad5d","Linux 2.6.29"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:50:31.248558Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:53:17.333Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72036","references":[{"url":"https://git.kernel.org/stable/c/3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a"},{"url":"https://git.kernel.org/stable/c/eb1a9637f0bd84b5db8803af65dfb1f44785406f"},{"url":"https://git.kernel.org/stable/c/7a5a1582710981ef6637de9f074a60a5b1d63222"},{"url":"https://git.kernel.org/stable/c/86a61e46a1919e8abf4d227c204773dabb24068a"},{"url":"https://git.kernel.org/stable/c/1b9cc255e8089606b92b2adf504e334573682821"},{"url":"https://git.kernel.org/stable/c/5889064919a1e5c0a9469c54895000414fc46944"},{"url":"https://git.kernel.org/stable/c/fffeb2ab5eeb823d4c2330571a098f63237c9049"},{"url":"https://git.kernel.org/stable/c/54f6b0c843e228d499eb4b6bbb89df68cad9ad5d"}],"tags":["cve.org"],"epss":0.00169,"epssPercentile":0.05784,"ingestedAt":"2026-10-16T17:24:46.873Z","slug":"CVE-2026-72036","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a`\n- `Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < eb1a9637f0bd84b5db8803af65dfb1f44785406f`\n- `Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 7a5a1582710981ef6637de9f074a60a5b1d63222`\n- `Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 86a61e46a1919e8abf4d227c204773dabb24068a`\n- `Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 1b9cc255e8089606b92b2adf504e334573682821`\n- `Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 5889064919a1e5c0a9469c54895000414fc46944`\n- `Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < fffeb2ab5eeb823d4c2330571a098f63237c9049`\n- `Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 54f6b0c843e228d499eb4b6bbb89df68cad9ad5d`\n- `Linux 2.6.29`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}