CVE-2026-89789Hinoki check available

Kernel crash via GTP link setup race

Published Sep 16, 2026 · Updated Sep 16, 2026

Use-after-free in the Linux kernel GTP driver from 4.7 allows local users to crash the kernel by racing failed link setup with packet receipt. The gtp_newlink error path frees tid_hash and addr_hash without an RCU grace period while gtp_encap_recv can retain and dereference the associated gtp_dev pointer. Triggering link creation and its failure path requires network-administration privileges; successful exploitation accesses freed kernel memory in softirq context.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Use-after-free in the Linux kernel GTP driver from 4.7 allows local users to crash the kernel by racing failed link setup with packet receipt. The gtp_newlink error path frees tid_hash and addr_hash without an RCU grace period while gtp_encap_recv can retain and dereference the associated gtp_dev pointer. Triggering link creation and its failure path requires network-administration privileges; successful exploitation accesses freed kernel memory in softirq context.

The record

CVE
CVE-2026-89789
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=459aa660eb1d8ce67080da1983bb81d716aa5a69 <3ca3da5c305caa873ddb81e8c6b118143f6dd3d1
  2. Affected versionversion=459aa660eb1d8ce67080da1983bb81d716aa5a69 <6f815c2fb6ab20385f81c353cdad0ea3b88132af
  3. Affected versionversion=459aa660eb1d8ce67080da1983bb81d716aa5a69 <7677eb2cbf2cc7446de474c01a6b06277c0051e5
  4. Affected versionversion=459aa660eb1d8ce67080da1983bb81d716aa5a69 <8d85498016a5bb56339734a14c276209fa65bafc
  5. Affected versionversion=459aa660eb1d8ce67080da1983bb81d716aa5a69 <d989e22ae9802c52c56ad4284d0caf26696cf6ae
  6. Affected versionversion=459aa660eb1d8ce67080da1983bb81d716aa5a69 <e3b9aa0773abd5d4ed90be41ce5306c146d5b09e
  7. Affected versionversion=459aa660eb1d8ce67080da1983bb81d716aa5a69 <fcafb2b1430824bae4258c01a439ec97ca0c6973
  8. Affected versionversion=459aa660eb1d8ce67080da1983bb81d716aa5a69 <fd8396cfecbd904468c71362f08aaa25f96d5337
  9. Affected versionversion=4.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=459aa660eb1d8ce67080da1983bb81d716aa5a69 <3ca3da5c305caa873ddb81e8c6b118143f6dd3d1; version=459aa660eb1d8ce67080da1983bb81d716aa5a69 <6f815c2fb6ab20385f81c353cdad0ea3b88132af; version=459aa660eb1d8ce67080da1983bb81d716aa5a69 <7677eb2cbf2cc7446de474c01a6b06277c0051e5; version=459aa660eb1d8ce67080da1983bb81d716aa5a69 <8d85498016a5bb56339734a14c276209fa65bafc; version=459aa660eb1d8ce67080da1983bb81d716aa5a69 <d989e22ae9802c52c56ad4284d0caf26696cf6ae; version=459aa660eb1d8ce67080da1983bb81d716aa5a69 <e3b9aa0773abd5d4ed90be41ce5306c146d5b09e; version=459aa660eb1d8ce67080da1983bb81d716aa5a69 <fcafb2b1430824bae4258c01a439ec97ca0c6973; version=459aa660eb1d8ce67080da1983bb81d716aa5a69 <fd8396cfecbd904468c71362f08aaa25f96d5337; version=4.7

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

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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