CVE-2026-72297

Kernel memory disclosure via unchecked ATM traffic classes

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds read in the Linux kernel ATM module allows local users to disclose kernel memory through invalid QoS traffic classes. The check_tp() path accepts values above ATM_ANYCLASS, SO_ATMQOS stores them in vcc->qos, and pvc_info() later uses them to index class_name[]. Exploitation requires local low-privileged access to set ATM QoS and read /proc/net/atm/pvc; no memory write or code execution is reported.

CVSS severity7.1
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux kernel ATM module allows local users to disclose kernel memory through invalid QoS traffic classes. The check_tp() path accepts values above ATM_ANYCLASS, SO_ATMQOS stores them in vcc->qos, and pvc_info() later uses them to index class_name[]. Exploitation requires local low-privileged access to set ATM QoS and read /proc/net/atm/pvc; no memory write or code execution is reported.

The record

CVE
CVE-2026-72297
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1a6dda72455b399ce9c1a12695471dc4d5c61add
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2b3e241729e87afed13ac0f666472d5d6ca42e87
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <367acd288bc6255e247cb1a1efbf5c6567cab423
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <513f820b3f0cf4462e17d84c39ed3948d061a6ea
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <806b7b6edc8446e8b94b706807a7090a14d47b5c
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cdf19f380e46192e7084be559638aab1f6ed86a2
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e62adb157c2eaad9ad4867ec6cd9af5b9a51b1c7
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <15444b57fdc6fc3f3e22a87f791ae5be81e6ecf5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <1a6dda72455b399ce9c1a12695471dc4d5c61add; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2b3e241729e87afed13ac0f666472d5d6ca42e87; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <367acd288bc6255e247cb1a1efbf5c6567cab423; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <513f820b3f0cf4462e17d84c39ed3948d061a6ea; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <806b7b6edc8446e8b94b706807a7090a14d47b5c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cdf19f380e46192e7084be559638aab1f6ed86a2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e62adb157c2eaad9ad4867ec6cd9af5b9a51b1c7; version=2.6.12

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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