CVE-2026-68452
s390/zcrypt: Validate length for CCA AES cipher key requests
Description
In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Validate length for CCA AES cipher key requests cca_cipher2protkey() derives the copy length for the CPRB parameter block directly from the length field in the key token. Reject the request early if the token length exceeds the available space in the parameter block.
INFO
Published Date :
Aug. 13, 2026, 3:19 p.m.
Last Modified :
Aug. 17, 2026, 6:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Apply the Linux kernel patch for s390/zcrypt.
- Validate key token length before processing.
- Reject requests with excessive token length.
- Ensure sufficient space in parameter blocks.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-68452.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-68452 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-68452
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-68452 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-68452 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd', 'lessThan': '406b317ea2b501f6f5eca1264293c9399a73a778', 'versionType': 'git'}, {'status': 'affected', 'version': '4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd', 'lessThan': '4fc46deceda076d429ef3fab2ccf8d96629ebd23', 'versionType': 'git'}, {'status': 'affected', 'version': '4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd', 'lessThan': 'ad93a1f1a45652478c0cf4eb029114e03af57f3b', 'versionType': 'git'}, {'status': 'affected', 'version': '4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd', 'lessThan': '3859f630b674801a00bca39bc451f52288591f65', 'versionType': 'git'}, {'status': 'affected', 'version': '4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd', 'lessThan': '06afe425d5283b9764303de47f554da5a808ce8a', 'versionType': 'git'}], 'programFiles': ['drivers/s390/crypto/zcrypt_ccamisc.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.4'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.4', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.151', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.103', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.44', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.8', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc6', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/s390/crypto/zcrypt_ccamisc.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd', 'lessThan': '406b317ea2b501f6f5eca1264293c9399a73a778', 'versionType': 'git'}, {'status': 'affected', 'version': '4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd', 'lessThan': '4fc46deceda076d429ef3fab2ccf8d96629ebd23', 'versionType': 'git'}, {'status': 'affected', 'version': '4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd', 'lessThan': 'ad93a1f1a45652478c0cf4eb029114e03af57f3b', 'versionType': 'git'}, {'status': 'affected', 'version': '4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd', 'lessThan': '3859f630b674801a00bca39bc451f52288591f65', 'versionType': 'git'}, {'status': 'affected', 'version': '4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd', 'lessThan': '06afe425d5283b9764303de47f554da5a808ce8a', 'versionType': 'git'}], 'programFiles': ['drivers/s390/crypto/zcrypt_ccamisc.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.4'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.4', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.151', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.103', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.44', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.8', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/s390/crypto/zcrypt_ccamisc.c'], 'defaultStatus': 'affected'}] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 13, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 13, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd', 'lessThan': '406b317ea2b501f6f5eca1264293c9399a73a778', 'versionType': 'git'}, {'status': 'affected', 'version': '4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd', 'lessThan': '4fc46deceda076d429ef3fab2ccf8d96629ebd23', 'versionType': 'git'}, {'status': 'affected', 'version': '4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd', 'lessThan': 'ad93a1f1a45652478c0cf4eb029114e03af57f3b', 'versionType': 'git'}, {'status': 'affected', 'version': '4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd', 'lessThan': '3859f630b674801a00bca39bc451f52288591f65', 'versionType': 'git'}, {'status': 'affected', 'version': '4bc123b18ce6ae6c42c69d0456b5acbd2f7bc8bd', 'lessThan': '06afe425d5283b9764303de47f554da5a808ce8a', 'versionType': 'git'}], 'programFiles': ['drivers/s390/crypto/zcrypt_ccamisc.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.4'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.4', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.151', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.103', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.44', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.8', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc6', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/s390/crypto/zcrypt_ccamisc.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Validate length for CCA AES cipher key requests cca_cipher2protkey() derives the copy length for the CPRB parameter block directly from the length field in the key token. Reject the request early if the token length exceeds the available space in the parameter block. Added Reference https://git.kernel.org/stable/c/06afe425d5283b9764303de47f554da5a808ce8a Added Reference https://git.kernel.org/stable/c/3859f630b674801a00bca39bc451f52288591f65 Added Reference https://git.kernel.org/stable/c/406b317ea2b501f6f5eca1264293c9399a73a778 Added Reference https://git.kernel.org/stable/c/4fc46deceda076d429ef3fab2ccf8d96629ebd23 Added Reference https://git.kernel.org/stable/c/ad93a1f1a45652478c0cf4eb029114e03af57f3b