CVE-2026-97959Public exploit

Kernel resource leak via retained cls_route bucket

Published Sep 25, 2026 · Updated Sep 25, 2026

Resource leak in the cls_route classifier in Linux 4.1 allows local users with network-administration privileges to retain kernel objects. route4_set_parms recomputes an existing filter handle and moves the filter, but the emptied old bucket remains in head->table[], causing route4_delete to report that filters remain and pin the empty tcf_proto. Reproduction requires the route4 classifier, ingress scheduler and classifier-action options; the demonstrated consequence is a kernel-object leak.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in the cls_route classifier in Linux 4.1 allows local users with network-administration privileges to retain kernel objects. route4_set_parms recomputes an existing filter handle and moves the filter, but the emptied old bucket remains in head->table[], causing route4_delete to report that filters remain and pin the empty tcf_proto. Reproduction requires the route4 classifier, ingress scheduler and classifier-action options; the demonstrated consequence is a kernel-object leak.

The record

CVE
CVE-2026-97959
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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=1e052be69d045c8d0f82ff1116fd3e5a79661745 <1853f30cf5c84971f99788a76207c6f745380896
  2. Affected versionversion=1e052be69d045c8d0f82ff1116fd3e5a79661745 <2e2f130951d34871b0643bf700164d97cff4b427
  3. Affected versionversion=1e052be69d045c8d0f82ff1116fd3e5a79661745 <81dd117c04422c6d0c7974aba9fa6a0ba370959b
  4. Affected versionversion=1e052be69d045c8d0f82ff1116fd3e5a79661745 <f8495d67434e1cb7e511297687ca55fdb28e4c20
  5. Affected versionversion=4.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=1e052be69d045c8d0f82ff1116fd3e5a79661745 <1853f30cf5c84971f99788a76207c6f745380896; version=1e052be69d045c8d0f82ff1116fd3e5a79661745 <2e2f130951d34871b0643bf700164d97cff4b427; version=1e052be69d045c8d0f82ff1116fd3e5a79661745 <81dd117c04422c6d0c7974aba9fa6a0ba370959b; version=1e052be69d045c8d0f82ff1116fd3e5a79661745 <f8495d67434e1cb7e511297687ca55fdb28e4c20; version=4.1

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

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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