CVE-2026-72036High· 7.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: net/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked multiq_dequeue() takes a packet from a band's child with a direct ->dequeue() cal…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
net/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked
multiq_dequeue() takes a packet from a band's child with a direct ->dequeue() call after multiq_peek() peeked it. When the child is non-work-conserving the peek stashes the skb in the child's gso_skb, so the direct dequeue returns a different skb and orphans the stash, desyncing the child's qlen/backlog. With a qfq child reached through a peeking parent (e.g. tbf) this re-enters the child on an emptied list and dereferences NULL, panicking the kernel from softirq on ordinary egress.
Take the packet through qdisc_dequeue_peeked(), as sch_prio already does and as sch_red and sch_sfb were just fixed to do. The helper is a no-op when the child has no stash, so a work-conserving child is unaffected.
Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 3e5fd9d14f2d228e7260251f2e4a1d41ba8f705aLinux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < eb1a9637f0bd84b5db8803af65dfb1f44785406fLinux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 7a5a1582710981ef6637de9f074a60a5b1d63222Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 86a61e46a1919e8abf4d227c204773dabb24068aLinux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 1b9cc255e8089606b92b2adf504e334573682821Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 5889064919a1e5c0a9469c54895000414fc46944Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < fffeb2ab5eeb823d4c2330571a098f63237c9049Linux >= 77be155cba4e163e8bba9fd27222a8b6189ec4f7 < 54f6b0c843e228d499eb4b6bbb89df68cad9ad5dLinux 2.6.29Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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