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CVE-2026-72036

net/sched: sch_multiq: Replace direct dequeue call with peek and qdisc_dequeue_peeked

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 77be155cba4e163e8bba9fd27222a8b6189ec4f7 · fixed in 3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a; From 77be155cba4e163e8bba9fd27222a8b6189ec4f7 · fixed in eb1a9637f0bd84b5db8803af65dfb1f44785406f; From 77be155cba4e163e8bba9fd27222a8b6189ec4f7 · fixed in 7a5a1582710981ef6637de9f074a60a5b1d63222; From 77be155cba4e163e8bba9fd27222a8b6189ec4f7 · fixed in 86a61e46a1919e8abf4d227c204773dabb24068a; From 77be155cba4e163e8bba9fd27222a8b6189ec4f7 · fixed in 1b9cc255e8089606b92b2adf504e334573682821; From 77be155cba4e163e8bba9fd27222a8b6189ec4f7 · fixed in 5889064919a1e5c0a9469c54895000414fc46944; From 77be155cba4e163e8bba9fd27222a8b6189ec4f7 · fixed in fffeb2ab5eeb823d4c2330571a098f63237c9049; From 77be155cba4e163e8bba9fd27222a8b6189ec4f7 · fixed in 54f6b0c843e228d499eb4b6bbb89df68cad9ad5d

  • Linux Linux

    2.6.29

  • KernelLinux

    From 2.6.29 · fixed in 5.10.261; From 5.11.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 8

git.kernel.org