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NVD / CVE Program· CNA Linux

CVE-2026-72297: net: atm: reject out-of-range traffic classes in QoS validation

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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 15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5, 1a6dda72455b399ce9c1a12695471dc4d5c61add, 2b3e241729e87afed13ac0f666472d5d6ca42e87.

Low priority for now. Upgrade to Linux Linux 15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5, 1a6dda72455b399ce9c1a12695471dc4d5c61add, 2b3e241729e87afed13ac0f666472d5d6ca42e87 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: atm: reject out-of-range traffic classes in QoS validation Reject ATM traffic classes above ATM_ANYCLASS in check_tp(). SO_ATMQOS stores the supplied QoS after check_qos() succeeds, so accepting larger values leaves invalid traffic_class values in vcc->qos. That bad state later reaches pvc_info(), which indexes class_name[] with vcc->qos.{rx,tp}.traffic_class. Values above ATM_ANYCLASS cause an out-of-bounds read when /proc/net/atm/pvc is read. Tighten the existing QoS validation so invalid traffic_class values are rejected at the point where user supplied QoS is accepted.

HighCVSS 7.1 · 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

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.1
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.

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

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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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 1a6dda72455b399ce9c1a12695471dc4d5c61addaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 2b3e241729e87afed13ac0f666472d5d6ca42e87affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 367acd288bc6255e247cb1a1efbf5c6567cab423affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 513f820b3f0cf4462e17d84c39ed3948d061a6eaaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before e62adb157c2eaad9ad4867ec6cd9af5b9a51b1c7affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 806b7b6edc8446e8b94b706807a7090a14d47b5caffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before cdf19f380e46192e7084be559638aab1f6ed86a2affected · git
    • before 2.6.12not 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-2026-72289Aug 15, 2026 · KVM: arm64: vgic: Check the interrupt is still ours before migrating it
    37Monitor
  • ← EarlierCVE-2026-72296Aug 15, 2026 · net: ife: require ETH_HLEN to be pullable in ife_decode()
    36Monitor
  • Later →CVE-2026-72298Aug 15, 2026 · net: qrtr: fix 32-bit integer overflow in qrtr_endpoint_post()
    33Monitor

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 Linux15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5Vendor (CNA)
Linux Linux1a6dda72455b399ce9c1a12695471dc4d5c61addVendor (CNA)
Linux Linux2b3e241729e87afed13ac0f666472d5d6ca42e87Vendor (CNA)
Linux Linux367acd288bc6255e247cb1a1efbf5c6567cab423Vendor (CNA)
Linux Linux513f820b3f0cf4462e17d84c39ed3948d061a6eaVendor (CNA)
Linux Linux806b7b6edc8446e8b94b706807a7090a14d47b5cVendor (CNA)
Linux Linuxcdf19f380e46192e7084be559638aab1f6ed86a2Vendor (CNA)
Linux Linuxe62adb157c2eaad9ad4867ec6cd9af5b9a51b1c7Vendor (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
none
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
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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