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CVE-2026-89748

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: tracing: Fix retry exhaustion in simple ring buffer reader swap simple_ring_buffer_swap_reader_page() starts with retry set to…

Published Sep 11, 2026EPSS 0.17%

Overview

CVE-2026-89748 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

tracing: Fix retry exhaustion in simple ring buffer reader swap

simple_ring_buffer_swap_reader_page() starts with retry set to 8 and

post-decrements it only after a failed link replacement. On the final

attempt, a successful replacement leaves retry at zero, while a failed

replacement leaves it at -1.

The current !retry test reverses both outcomes. It returns an error after

a successful final replacement, leaving the link update complete but the

reader bookkeeping unfinished. After a failed final replacement, it

falls through and updates the head and reader pointers as though the

replacement succeeded, which can corrupt the ring.

Treat only a negative counter as exhaustion and return the documented

-EBUSY error.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/df02489aa3aa1834659f0d20c89f7d212047d268Refgit.kernel.org/stable/c/e0d3aed7b12cf37b74c7cc5265073d0263b49cde

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89748?

CVE-2026-89748 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-89748?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-89748?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-89748?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89748 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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