CVE-2026-64559
s390/pkey: Check length in PKEY_VERIFYPROTK ioctl
Description
In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Check length in PKEY_VERIFYPROTK ioctl Explicitly check the buffer length request structure provided by user-space and fail, if it exceeds the buffer size.
INFO
Published Date :
July 29, 2026, 5:16 p.m.
Last Modified :
July 29, 2026, 5:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-64559
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Apply the patch for s390/pkey to check buffer length.
- Ensure user-space input does not exceed buffer size.
- Update the Linux kernel to the patched version.
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-2026-64559.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64559 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-2026-64559
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-2026-64559 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64559 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.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 29, 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': '8fcc231ce3bea12b78bb94b280cdc03cff342435', 'lessThan': '0a9e34ccbe772b8f321388cdbdf4f22b94e513e7', 'versionType': 'git'}, {'status': 'affected', 'version': '8fcc231ce3bea12b78bb94b280cdc03cff342435', 'lessThan': '693bf91d4db134f9b1c2840c8e287eee3d993bac', 'versionType': 'git'}, {'status': 'affected', 'version': '8fcc231ce3bea12b78bb94b280cdc03cff342435', 'lessThan': '7e7e03848c918aa0acad5ffd75d929e3afec1554', 'versionType': 'git'}, {'status': 'affected', 'version': '8fcc231ce3bea12b78bb94b280cdc03cff342435', 'lessThan': 'b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970', 'versionType': 'git'}], 'programFiles': ['drivers/s390/crypto/pkey_api.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.12'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.12', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.40', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.5', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/s390/crypto/pkey_api.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Check length in PKEY_VERIFYPROTK ioctl Explicitly check the buffer length request structure provided by user-space and fail, if it exceeds the buffer size. Added Reference https://git.kernel.org/stable/c/0a9e34ccbe772b8f321388cdbdf4f22b94e513e7 Added Reference https://git.kernel.org/stable/c/693bf91d4db134f9b1c2840c8e287eee3d993bac Added Reference https://git.kernel.org/stable/c/7e7e03848c918aa0acad5ffd75d929e3afec1554 Added Reference https://git.kernel.org/stable/c/b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970