CVE-2026-68354

FireWire datagram loss via incomplete fragment merging

Published Aug 10, 2026 · Updated Aug 10, 2026

Datagram reassembly error in the Linux kernel allows adjacent attackers to interrupt FireWire network packet delivery. fwnet_frag_new() compares neighbors against a fragment's old edge and treats the list head as a fragment, so bridging ranges can remain unmerged and fwnet_pd_is_complete() misses a complete datagram. Reachability requires crafted fragmented traffic over a FireWire network; the demonstrated consequence is loss of completed datagram delivery.

CVSS severity8.8
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Datagram reassembly error in the Linux kernel allows adjacent attackers to interrupt FireWire network packet delivery. fwnet_frag_new() compares neighbors against a fragment's old edge and treats the list head as a fragment, so bridging ranges can remain unmerged and fwnet_pd_is_complete() misses a complete datagram. Reachability requires crafted fragmented traffic over a FireWire network; the demonstrated consequence is loss of completed datagram delivery.

The record

CVE
CVE-2026-68354
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
adjacent
Privileges
unauthenticated

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=2.6.31
  2. Affected versionversion=c76acec6d55107b652a37c90b36c00bc8b04dabb <0177e578d7a885037b0fb82286c12e9d0360cc10
  3. Affected versionversion=c76acec6d55107b652a37c90b36c00bc8b04dabb <22e05b8ddbcf7d22c7f1598786e86635547e554d
  4. Affected versionversion=c76acec6d55107b652a37c90b36c00bc8b04dabb <2a5aa4e9b89227d1a1690fb8d5b81e5f3b261999
  5. Affected versionversion=c76acec6d55107b652a37c90b36c00bc8b04dabb <b7d633c7c92321be98724b1d365e8ce507f2f349
  6. Affected versionversion=c76acec6d55107b652a37c90b36c00bc8b04dabb <d52a13adbb8ccbab99cd3bad36804e87d8b5c052

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.31; version=c76acec6d55107b652a37c90b36c00bc8b04dabb <0177e578d7a885037b0fb82286c12e9d0360cc10; version=c76acec6d55107b652a37c90b36c00bc8b04dabb <22e05b8ddbcf7d22c7f1598786e86635547e554d; version=c76acec6d55107b652a37c90b36c00bc8b04dabb <2a5aa4e9b89227d1a1690fb8d5b81e5f3b261999; version=c76acec6d55107b652a37c90b36c00bc8b04dabb <b7d633c7c92321be98724b1d365e8ce507f2f349; version=c76acec6d55107b652a37c90b36c00bc8b04dabb <d52a13adbb8ccbab99cd3bad36804e87d8b5c052

Published CVSS scores

8.8Linux kernel CVE teamCVSS:3.1/AV:A/AC:L/PR:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

No sourced classifications are available.

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

See the directory against your own environment.

Your stack

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