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CVE-2026-72036· NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.16% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 1b9cc255e8089606b92b2adf504e334573682821, 3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a, 54f6b0c843e228d499eb4b6bbb89df68cad9ad5d.

Low priority for now. Upgrade to Linux Linux 1b9cc255e8089606b92b2adf504e334573682821, 3e5fd9d14f2d228e7260251f2e4a1d41ba8f705a, 54f6b0c843e228d499eb4b6bbb89df68cad9ad5d or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Aug 15, 2026
Updated
Oct 16, 2026
EPSS
0.1% · 5th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-72036

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.29affected
    • 77be155cba4e163e8bba9fd27222a8b6189ec4f7 and later · before 3e5fd9d14f2d228e7260251f2e4a1d41ba8f705aaffected · git
    • 77be155cba4e163e8bba9fd27222a8b6189ec4f7 and later · before eb1a9637f0bd84b5db8803af65dfb1f44785406faffected · git
    • 77be155cba4e163e8bba9fd27222a8b6189ec4f7 and later · before 7a5a1582710981ef6637de9f074a60a5b1d63222affected · git
    • 77be155cba4e163e8bba9fd27222a8b6189ec4f7 and later · before 86a61e46a1919e8abf4d227c204773dabb24068aaffected · git
    • 77be155cba4e163e8bba9fd27222a8b6189ec4f7 and later · before 1b9cc255e8089606b92b2adf504e334573682821affected · git
    • 77be155cba4e163e8bba9fd27222a8b6189ec4f7 and later · before 5889064919a1e5c0a9469c54895000414fc46944affected · git
    • 77be155cba4e163e8bba9fd27222a8b6189ec4f7 and later · before fffeb2ab5eeb823d4c2330571a098f63237c9049affected · git
    • 77be155cba4e163e8bba9fd27222a8b6189ec4f7 and later · before 54f6b0c843e228d499eb4b6bbb89df68cad9ad5daffected · git
    • before 2.6.29not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-72034Aug 15, 2026 · fhandle: reject detached mounts in capable_wrt_mount()
    31Monitor
  • ← EarlierCVE-2026-72035Aug 15, 2026 · net/sched: sch_taprio: Replace direct dequeue call with peek and qdisc_dequeue_peeked
    32Monitor
  • Later →CVE-2026-72041Aug 15, 2026 · espintcp: use sk_msg_free_partial to fix partial send
    39Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux1b9cc255e8089606b92b2adf504e334573682821Vendor (CNA)
Linux Linux3e5fd9d14f2d228e7260251f2e4a1d41ba8f705aVendor (CNA)
Linux Linux54f6b0c843e228d499eb4b6bbb89df68cad9ad5dVendor (CNA)
Linux Linux5889064919a1e5c0a9469c54895000414fc46944Vendor (CNA)
Linux Linux7a5a1582710981ef6637de9f074a60a5b1d63222Vendor (CNA)
Linux Linux86a61e46a1919e8abf4d227c204773dabb24068aVendor (CNA)
Linux Linuxeb1a9637f0bd84b5db8803af65dfb1f44785406fVendor (CNA)
Linux Linuxfffeb2ab5eeb823d4c2330571a098f63237c9049Vendor (CNA)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records