CVE-2026-68452

Kernel memory corruption via unchecked token length

Published Aug 13, 2026 · Updated Aug 13, 2026

Heap overflow in the Linux s390 zcrypt driver allows local users to corrupt kernel memory through a crafted CCA AES cipher key token. cca_cipher2protkey() trusts the token len field as memcpy()'s length into a 512-byte CPRB parameter block, permitting writes about 7.6 KB beyond the allocation. Any local user able to open world-writable /dev/pkey can trigger the overflow without crypto-card interaction, enabling kernel-memory disclosure, control-flow corruption, or a panic.

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

Heap overflow in the Linux s390 zcrypt driver allows local users to corrupt kernel memory through a crafted CCA AES cipher key token. cca_cipher2protkey() trusts the token len field as memcpy()'s length into a 512-byte CPRB parameter block, permitting writes about 7.6 KB beyond the allocation. Any local user able to open world-writable /dev/pkey can trigger the overflow without crypto-card interaction, enabling kernel-memory disclosure, control-flow corruption, or a panic.

The record

CVE
CVE-2026-68452
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
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=4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd <06afe425d5283b9764303de47f554da5a808ce8a
  2. Affected versionversion=4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd <3859f630b674801a00bca39bc451f52288591f65
  3. Affected versionversion=4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd <406b317ea2b501f6f5eca1264293c9399a73a778
  4. Affected versionversion=4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd <4fc46deceda076d429ef3fab2ccf8d96629ebd23
  5. Affected versionversion=4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd <ad93a1f1a45652478c0cf4eb029114e03af57f3b
  6. Affected versionversion=5.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd <06afe425d5283b9764303de47f554da5a808ce8a; version=4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd <3859f630b674801a00bca39bc451f52288591f65; version=4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd <406b317ea2b501f6f5eca1264293c9399a73a778; version=4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd <4fc46deceda076d429ef3fab2ccf8d96629ebd23; version=4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd <ad93a1f1a45652478c0cf4eb029114e03af57f3b; version=5.4

Published CVSS scores

7.3SUSECVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8Linux Kernel Association CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0SUSECVSS: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

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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

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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