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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72036
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:21:12 UTC
Updated2026-08-17 06:18:01 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001640000 probability, percentile 0.060790000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 77be155cba4e163e8bba9fd27222a8b6189ec4f7 3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a git Not specified
CNA Linux Linux affected 77be155cba4e163e8bba9fd27222a8b6189ec4f7 eb1a9637f0bd84b5db8803af65dfb1f44785406f git Not specified
CNA Linux Linux affected 77be155cba4e163e8bba9fd27222a8b6189ec4f7 7a5a1582710981ef6637de9f074a60a5b1d63222 git Not specified
CNA Linux Linux affected 77be155cba4e163e8bba9fd27222a8b6189ec4f7 86a61e46a1919e8abf4d227c204773dabb24068a git Not specified
CNA Linux Linux affected 77be155cba4e163e8bba9fd27222a8b6189ec4f7 1b9cc255e8089606b92b2adf504e334573682821 git Not specified
CNA Linux Linux affected 77be155cba4e163e8bba9fd27222a8b6189ec4f7 5889064919a1e5c0a9469c54895000414fc46944 git Not specified
CNA Linux Linux affected 77be155cba4e163e8bba9fd27222a8b6189ec4f7 fffeb2ab5eeb823d4c2330571a098f63237c9049 git Not specified
CNA Linux Linux affected 77be155cba4e163e8bba9fd27222a8b6189ec4f7 54f6b0c843e228d499eb4b6bbb89df68cad9ad5d git Not specified
CNA Linux Linux affected 2.6.29 Not specified
CNA Linux Linux unaffected 2.6.29 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1b9cc255e8089606b92b2adf504e334573682821 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5889064919a1e5c0a9469c54895000414fc46944 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eb1a9637f0bd84b5db8803af65dfb1f44785406f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fffeb2ab5eeb823d4c2330571a098f63237c9049 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7a5a1582710981ef6637de9f074a60a5b1d63222 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/54f6b0c843e228d499eb4b6bbb89df68cad9ad5d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/86a61e46a1919e8abf4d227c204773dabb24068a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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