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7.8
HIGH CVSS 3.1
CVE-2026-64015
security/keys: fix missed RCU read section on lookup
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: security/keys: fix missed RCU read section on lookup Nicholas Carlini reports that the keyring code calls assoc_array_find() in find_key_to_update() without holding the RCU read lock, while the assoc_array_gc() code really is designed around removing the node from the tree and then freeing it after an RCU grace-period. The regular key handling doesn't see this because holding the keyring semaphore hides any lifetime issues, but the persistent key handling uses a different model. Instead of extending the keyring locking, just do the simple RCU locking that the assoc_array was designed for.

Details
INFO

Published Date :

July 19, 2026, 4:17 p.m.

Last Modified :

July 30, 2026, 2:59 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-64015 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.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Apply kernel patch for RCU read section fix in keyring.
  • Update the Linux kernel to the latest version.
  • Verify RCU read section is correctly locked.
  • Ensure persistent key handling uses correct model.
  • Review keyring locking mechanisms.
References
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-2026-64015.

URL Resource
https://git.kernel.org/stable/c/43a1e3744548e6fd85873e6fb43e293eb4010694
https://git.kernel.org/stable/c/4c5d407ba3ff7f30561ff73ba1b07ed70c864edc
https://git.kernel.org/stable/c/50bb3435a5e627bfbdc52eb4536f49f88b3486b8
https://git.kernel.org/stable/c/5659e6923cb72f8e18e8b539109ab512455fe195
https://git.kernel.org/stable/c/66288dcadf80974436250e9f70ed848836b835b5
https://git.kernel.org/stable/c/cefa4265b11176c897a7d9e8e54d89e3701c5584
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-64015 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-2026-64015 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-2026-64015 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-64015 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

    Jul. 20, 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
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jul. 20, 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': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '4c5d407ba3ff7f30561ff73ba1b07ed70c864edc', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': 'cefa4265b11176c897a7d9e8e54d89e3701c5584', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '5659e6923cb72f8e18e8b539109ab512455fe195', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '50bb3435a5e627bfbdc52eb4536f49f88b3486b8', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '66288dcadf80974436250e9f70ed848836b835b5', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '43a1e3744548e6fd85873e6fb43e293eb4010694', 'versionType': 'git'}, {'status': 'affected', 'version': '0', 'lessThan': '6.1.175', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '6.6.142', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '6.12.92', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '6.18.34', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '7.0.11', 'versionType': 'semver'}], 'programFiles': ['security/keys/keyring.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'unaffected', 'version': '6.1.175', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.142', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.92', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.34', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.11', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['security/keys/keyring.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'b2a4df200d570b2c33a57e1ebfa5896e4bc81b69', 'lessThan': '4c5d407ba3ff7f30561ff73ba1b07ed70c864edc', 'versionType': 'git'}, {'status': 'affected', 'version': 'b2a4df200d570b2c33a57e1ebfa5896e4bc81b69', 'lessThan': 'cefa4265b11176c897a7d9e8e54d89e3701c5584', 'versionType': 'git'}, {'status': 'affected', 'version': 'b2a4df200d570b2c33a57e1ebfa5896e4bc81b69', 'lessThan': '5659e6923cb72f8e18e8b539109ab512455fe195', 'versionType': 'git'}, {'status': 'affected', 'version': 'b2a4df200d570b2c33a57e1ebfa5896e4bc81b69', 'lessThan': '50bb3435a5e627bfbdc52eb4536f49f88b3486b8', 'versionType': 'git'}, {'status': 'affected', 'version': 'b2a4df200d570b2c33a57e1ebfa5896e4bc81b69', 'lessThan': '66288dcadf80974436250e9f70ed848836b835b5', 'versionType': 'git'}, {'status': 'affected', 'version': 'b2a4df200d570b2c33a57e1ebfa5896e4bc81b69', 'lessThan': '43a1e3744548e6fd85873e6fb43e293eb4010694', 'versionType': 'git'}], 'programFiles': ['security/keys/keyring.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.13'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.13', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.1.175', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.142', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.92', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.34', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.11', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['security/keys/keyring.c'], 'defaultStatus': 'affected'}]
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jul. 19, 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': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '4c5d407ba3ff7f30561ff73ba1b07ed70c864edc', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': 'cefa4265b11176c897a7d9e8e54d89e3701c5584', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '5659e6923cb72f8e18e8b539109ab512455fe195', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '50bb3435a5e627bfbdc52eb4536f49f88b3486b8', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '66288dcadf80974436250e9f70ed848836b835b5', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '43a1e3744548e6fd85873e6fb43e293eb4010694', 'versionType': 'git'}, {'status': 'affected', 'version': '0', 'lessThan': '6.1.175', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '6.6.142', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '6.12.92', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '6.18.34', 'versionType': 'semver'}, {'status': 'affected', 'version': '0', 'lessThan': '7.0.11', 'versionType': 'semver'}], 'programFiles': ['security/keys/keyring.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'unaffected', 'version': '6.1.175', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.142', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.92', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.34', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.11', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['security/keys/keyring.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: security/keys: fix missed RCU read section on lookup Nicholas Carlini reports that the keyring code calls assoc_array_find() in find_key_to_update() without holding the RCU read lock, while the assoc_array_gc() code really is designed around removing the node from the tree and then freeing it after an RCU grace-period. The regular key handling doesn't see this because holding the keyring semaphore hides any lifetime issues, but the persistent key handling uses a different model. Instead of extending the keyring locking, just do the simple RCU locking that the assoc_array was designed for.
    Added Reference https://git.kernel.org/stable/c/43a1e3744548e6fd85873e6fb43e293eb4010694
    Added Reference https://git.kernel.org/stable/c/4c5d407ba3ff7f30561ff73ba1b07ed70c864edc
    Added Reference https://git.kernel.org/stable/c/50bb3435a5e627bfbdc52eb4536f49f88b3486b8
    Added Reference https://git.kernel.org/stable/c/5659e6923cb72f8e18e8b539109ab512455fe195
    Added Reference https://git.kernel.org/stable/c/66288dcadf80974436250e9f70ed848836b835b5
    Added Reference https://git.kernel.org/stable/c/cefa4265b11176c897a7d9e8e54d89e3701c5584
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 7.8
Attack Vector
Attack Complexity
Privileges Required
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Scope
Confidentiality Impact
Integrity Impact
Availability Impact