Go to homepageCyberStrike

Menu

Star on GitHub · 3.4k
Sign inDownload

CVE-2026-89988

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: kprobes: Protect kprobe_blacklist with RCU __within_kprobe_blacklist() traverses kprobe_blacklist without holding kprobe_mutex.

Published Sep 16, 2026EPSS 0.17%

Overview

CVE-2026-89988 is a high-severity vulnerability. It was published on September 16, 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:

kprobes: Protect kprobe_blacklist with RCU

__within_kprobe_blacklist() traverses kprobe_blacklist without holding

kprobe_mutex. When a module is unloaded, kprobe_remove_area_blacklist()

removes blacklist entries and immediately frees them with kfree().

A concurrent call to within_kprobe_blacklist() can therefore dereference

freed memory.

Furthermore, within_kprobe_blacklist() can be called in atomic or

non-preemptible contexts where the sleeping kprobe_mutex cannot be taken.

Protect kprobe_blacklist with RCU. Use guard(rcu)() and

list_for_each_entry_rcu() for traversal, list_add_tail_rcu() for

insertions, list_del_rcu() for deletions, and kfree_rcu() to reclaim

entries safely after a grace period.

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/0c4256196b3a105307e2235fbfd85e768bbcdd0fRefgit.kernel.org/stable/c/3fb8386682ef4d0858c38bf0d8d8a47ba171fa23Refgit.kernel.org/stable/c/518d9b5568bb06f86e4434f7a30faa9612ea91adRefgit.kernel.org/stable/c/5d97a13defc648c64d138145ace429b6a3d08943Refgit.kernel.org/stable/c/5da247e4d1e8661d4d6f997101d59967e8994e32Refgit.kernel.org/stable/c/630ed8734a02b992e8a97538179c2ece42c5210fRefgit.kernel.org/stable/c/6e62cf983a2bd547e6bbd3f935539233e5f97f8fRefgit.kernel.org/stable/c/8f406205003f741225f620f0e357ca0de71d45e3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89988?

CVE-2026-89988 is a high-severity vulnerability. It was published on September 16, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-89988?

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-2026-89988?

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-2026-89988?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89988 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.

Related HIGH CVEs from 2026

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999
LiveWatch live →