CVE-2026-68451

Kernel memory corruption via unchecked key-token length

Published Aug 13, 2026 · Updated Aug 13, 2026

Out-of-bounds write in the Linux kernel s390 zcrypt module since 5.10 allows local users to corrupt kernel memory via /dev/pkey. cca_ecc2protkey() trusts the ECC token's length field when copying attacker-controlled bytes into a smaller CPRB parameter block. The world-writable device and unchecked ioctls expose the flaw to unprivileged s390 users, enabling a kernel panic or privilege escalation.

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

Out-of-bounds write in the Linux kernel s390 zcrypt module since 5.10 allows local users to corrupt kernel memory via /dev/pkey. cca_ecc2protkey() trusts the ECC token's length field when copying attacker-controlled bytes into a smaller CPRB parameter block. The world-writable device and unchecked ioctls expose the flaw to unprivileged s390 users, enabling a kernel panic or privilege escalation.

The record

CVE
CVE-2026-68451
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-805, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 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=5.10
  2. Affected versionversion=fa6999e326fe7851ecbd572b8cb9be8e930ebf41 <013a4484f061a2b41f052e25c0015203287e63f1
  3. Affected versionversion=fa6999e326fe7851ecbd572b8cb9be8e930ebf41 <8fa3e9435a13c335efb63fb4f4e77531a0031159
  4. Affected versionversion=fa6999e326fe7851ecbd572b8cb9be8e930ebf41 <a9ae0f6dd45c3ccc1d69363f7aea8af179122730
  5. Affected versionversion=fa6999e326fe7851ecbd572b8cb9be8e930ebf41 <dd25bd9b0f36849808bd7625dcc59dd4c1aeef3e
  6. Affected versionversion=fa6999e326fe7851ecbd572b8cb9be8e930ebf41 <ecc3b8691c1935f9f3e4eb964ab11e40fdec17f5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.10; version=fa6999e326fe7851ecbd572b8cb9be8e930ebf41 <013a4484f061a2b41f052e25c0015203287e63f1; version=fa6999e326fe7851ecbd572b8cb9be8e930ebf41 <8fa3e9435a13c335efb63fb4f4e77531a0031159; version=fa6999e326fe7851ecbd572b8cb9be8e930ebf41 <a9ae0f6dd45c3ccc1d69363f7aea8af179122730; version=fa6999e326fe7851ecbd572b8cb9be8e930ebf41 <dd25bd9b0f36849808bd7625dcc59dd4c1aeef3e; version=fa6999e326fe7851ecbd572b8cb9be8e930ebf41 <ecc3b8691c1935f9f3e4eb964ab11e40fdec17f5

Published CVSS scores

7.8Linux CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Red HatCVSS:3.1/AV:L/AC:H/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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-805Buffer Access with Incorrect Length Value
T1068Exploitation for Privilege Escalation

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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