CVE-2026-68301

Local resource exhaustion via stale VLAN references

Published Aug 10, 2026 · Updated Aug 10, 2026

Resource leak in Linux HSR networking allows local users to exhaust memory by unregistering a slave device while HSR is active. The hsr_del_port() path detaches the slave without deleting VLAN IDs synchronized from the HSR master, leaving vlan_info references allocated after destruction. Reaching the flaw requires local control of HSR interface teardown; published sources do not establish whether exhaustion causes a hang, crash, or reboot.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in Linux HSR networking allows local users to exhaust memory by unregistering a slave device while HSR is active. The hsr_del_port() path detaches the slave without deleting VLAN IDs synchronized from the HSR master, leaving vlan_info references allocated after destruction. Reaching the flaw requires local control of HSR interface teardown; published sources do not establish whether exhaustion causes a hang, crash, or reboot.

The record

CVE
CVE-2026-68301
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-772, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1100242709d5644856131a9dd25d32672ebe7357
  2. Affected versionversion=1a8a63a5305e95519de6f941922dfcd8179f82e5 <ae995b8002d3af134560a706c0e111a89e26317c
  3. Affected versionversion=1a8a63a5305e95519de6f941922dfcd8179f82e5 <b5ded444621b6180df9f3d4e07045fc1fc1e8cd9
  4. Affected versionversion=1a8a63a5305e95519de6f941922dfcd8179f82e5 <dcf15eaf5641812f1cfc5e96537380132a7da89d
  5. Affected versionversion=5.15.194 <5.16
  6. Affected versionversion=6.1.153 <6.2
  7. Affected versionversion=6.12.48 <6.12.101
  8. Affected versionversion=6.13
  9. Affected versionversion=6.6.107 <6.6.148
  10. Affected versionversion=72dbae1f2f2159395089405c6c54632f2613f1be <f72c312af6c7897ab0f8a2b5a63f917a207a4143
  11. Affected versionversion=a2accc07bdcfb0c7ab2cacdca6a1fe8267816efa
  12. Affected versionversion=c707d2c5541d2bb94131968ad5dfeb06427a1dba <21d48408479a17eb65568a765930adea37e4d804

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1100242709d5644856131a9dd25d32672ebe7357; version=1a8a63a5305e95519de6f941922dfcd8179f82e5 <ae995b8002d3af134560a706c0e111a89e26317c; version=1a8a63a5305e95519de6f941922dfcd8179f82e5 <b5ded444621b6180df9f3d4e07045fc1fc1e8cd9; version=1a8a63a5305e95519de6f941922dfcd8179f82e5 <dcf15eaf5641812f1cfc5e96537380132a7da89d; version=5.15.194 <5.16; version=6.1.153 <6.2; version=6.12.48 <6.12.101; version=6.13; version=6.6.107 <6.6.148; version=72dbae1f2f2159395089405c6c54632f2613f1be <f72c312af6c7897ab0f8a2b5a63f917a207a4143; version=a2accc07bdcfb0c7ab2cacdca6a1fe8267816efa; version=c707d2c5541d2bb94131968ad5dfeb06427a1dba <21d48408479a17eb65568a765930adea37e4d804

Published CVSS scores

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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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