CVE-2026-15811 Red Hat Enterprise Linux 10 vulnerability
A vulnerability was found in kronosnet's (version <=1.34) cryptographic configuration management. The framework does not correctly zero-out or wipe sensitive memory segments after executing changes to its cryptographic configuration. This omission leaves raw encryption keys resident in memory after the associated structures are freed. A local attacker capable of leveraging memory disclosure techniques could exploit this flaw to retrieve the active encryption key, allowing them to decrypt cluster network communications or inject malicious packets to cause severe high-availability cluster instability.
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Red Hat Enterprise Linux 10 should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- Review vendor advisory for affected versions.
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
CVE-2026-15811 affects Red Hat Enterprise Linux 10 and involves sensitive-information exposure. Successful exploitation may expose credentials, keys, configuration, or other sensitive information. Prioritize deployments that process untrusted input, expose the affected feature, or hold sensitive data. Apply the Red Hat kronosnet update for the installed RHEL 10 channel when available; until then, restrict local access, protect crash dumps, and rotate cluster encryption keys after maintenance or suspected memory disclosure.
- Inventory every deployment, device, package, plugin, container, build, and environment that uses Red Hat Enterprise Linux 10.
- Compare the installed package, build, firmware, or commit with the affected range in the linked vendor and NVD advisories.
- Apply the Red Hat kronosnet update for the installed RHEL 10 channel when available; until then, restrict local access, protect crash dumps, and rotate cluster encryption keys after maintenance or suspected memory disclosure.
- Until patched, reduce public exposure, disable the affected workflow where practical, and allow access only from trusted users and systems.
- Review configuration, roles, tokens, network paths, and exposed endpoints connected to Red Hat Enterprise Linux 10; remove access that is not required.
- Review application, DNS, network, CI, and audit logs for unusual secret access, exports, or outbound transmission.
- If exploitation is suspected, isolate affected assets, preserve evidence, rotate exposed credentials or keys, restore trusted data, and rebuild compromised systems before returning them to service.
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Verify the fix
- Confirm every affected asset now runs the fixed vendor-supported release or has the documented mitigation for CVE-2026-15811 in place.
- Use a safe regression test to confirm the affected sensitive-information exposure path no longer produces the vulnerable behavior.
- Confirm temporary access controls, endpoint restrictions, network blocks, and least-privilege settings remain effective after the update.
- Review post-remediation logs and rerun Fixnx plus the relevant package, dependency, firmware, browser, or product-specific security check.
- Document affected assets, versions, changes, validation evidence, reviewed logs, and any credential rotation, cleanup, or replacement completed.
Related categories
Related security risks
More published guidance from the same primary category.
Trusted references
FAQ
What is affected by CVE-2026-15811?
Red Hat Enterprise Linux 10 should be checked against the vendor advisory and trusted references linked on this page.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.