CVE-2026-68297

Local kernel compromise via TIPC MTU truncation

Published Aug 10, 2026 · Updated Aug 10, 2026

Integer truncation in Linux kernel TIPC allows local users to crash or compromise the kernel via an oversized MTU value. TIPC_NL_MEDIA_SET and TIPC_NL_BEARER_SET accept values above 65535, and tipc_link_create silently narrows them into 16-bit fields; zero causes division by zero while small results create undersized fragments. An unprivileged local user obtains the required capability through a user namespace; exploitation enables a kernel crash, kernel-memory reads or overwrites, and control-flow hijacking.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer truncation in Linux kernel TIPC allows local users to crash or compromise the kernel via an oversized MTU value. TIPC_NL_MEDIA_SET and TIPC_NL_BEARER_SET accept values above 65535, and tipc_link_create silently narrows them into 16-bit fields; zero causes division by zero while small results create undersized fragments. An unprivileged local user obtains the required capability through a user namespace; exploitation enables a kernel crash, kernel-memory reads or overwrites, and control-flow hijacking.

The record

CVE
CVE-2026-68297
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-369, T1068
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=4.18
  2. Affected versionversion=901271e0403af638c224987c2a4e55cebade7e91 <1b8fb5a20508bfb0db854e01214888c761b3a911
  3. Affected versionversion=901271e0403af638c224987c2a4e55cebade7e91 <9f29cd8a8e7901a2617c8064ce9f50fc67b97cb8
  4. Affected versionversion=901271e0403af638c224987c2a4e55cebade7e91 <c1cda72f6acec02ebd45d913bf8527ff77336ba6
  5. Affected versionversion=901271e0403af638c224987c2a4e55cebade7e91 <f02334a9e378f7e07232b26dc3d2ab353339f040
  6. Affected versionversion=901271e0403af638c224987c2a4e55cebade7e91 <f4013598b69457dbea350df52e52daea6faef8eb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.18; version=901271e0403af638c224987c2a4e55cebade7e91 <1b8fb5a20508bfb0db854e01214888c761b3a911; version=901271e0403af638c224987c2a4e55cebade7e91 <9f29cd8a8e7901a2617c8064ce9f50fc67b97cb8; version=901271e0403af638c224987c2a4e55cebade7e91 <c1cda72f6acec02ebd45d913bf8527ff77336ba6; version=901271e0403af638c224987c2a4e55cebade7e91 <f02334a9e378f7e07232b26dc3d2ab353339f040; version=901271e0403af638c224987c2a4e55cebade7e91 <f4013598b69457dbea350df52e52daea6faef8eb

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8Linux CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-369Divide By Zero
T1068Exploitation for Privilege Escalation

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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