CVE-2026-68385Network attack vector

Kernel memory disclosure via null-address checksum fallback

Published Aug 10, 2026 · Updated Aug 10, 2026

Incorrect checksum handling in Linux allows remote attackers to disclose kernel memory through crafted network traffic. On s390 systems without the vector facility, csum_partial() calls csum_copy() with a null destination, causing the fallback to checksum address zero instead of the source buffer. Network traffic reaches the path without credentials; emitted checksums can reveal low kernel memory, accept corrupted payloads, disrupt connectivity, or crash the kernel.

CVSS severity9.8
Critical
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect checksum handling in Linux allows remote attackers to disclose kernel memory through crafted network traffic. On s390 systems without the vector facility, csum_partial() calls csum_copy() with a null destination, causing the fallback to checksum address zero instead of the source buffer. Network traffic reaches the path without credentials; emitted checksums can reveal low kernel memory, accept corrupted payloads, disrupt connectivity, or crash the kernel.

The record

CVE
CVE-2026-68385
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1005
Attack vector
network
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=6.9
  2. Affected versionversion=dcd3e1de9d17dc43dfed87a9fc814b9dec508043 <1d9a2f01b3c4e5c88e06b2db4b5460c2ec884722
  3. Affected versionversion=dcd3e1de9d17dc43dfed87a9fc814b9dec508043 <4bb06b60d982355e22647b3d12d6619419f8c1fa
  4. Affected versionversion=dcd3e1de9d17dc43dfed87a9fc814b9dec508043 <5fc0a2a6eeb99cac991242bb48796c7749ce3261
  5. Affected versionversion=dcd3e1de9d17dc43dfed87a9fc814b9dec508043 <898bb2814f38399108bdd2113f38d97383a7036a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.9; version=dcd3e1de9d17dc43dfed87a9fc814b9dec508043 <1d9a2f01b3c4e5c88e06b2db4b5460c2ec884722; version=dcd3e1de9d17dc43dfed87a9fc814b9dec508043 <4bb06b60d982355e22647b3d12d6619419f8c1fa; version=dcd3e1de9d17dc43dfed87a9fc814b9dec508043 <5fc0a2a6eeb99cac991242bb48796c7749ce3261; version=dcd3e1de9d17dc43dfed87a9fc814b9dec508043 <898bb2814f38399108bdd2113f38d97383a7036a

Published CVSS scores

3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
9.8Linux Kernel CVE TeamCVSS:3.1/AV:N/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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1005Data from Local System

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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