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CVE-2026-43376

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free by using call_rcu() for oplock_info ksmbd currently frees oplock_info immediately using kfree(), even…

Published May 8, 2026CWE-416EPSS 0.65%

Overview

CVE-2026-43376 is a critical-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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

ksmbd: fix use-after-free by using call_rcu() for oplock_info

ksmbd currently frees oplock_info immediately using kfree(), even

though it is accessed under RCU read-side critical sections in places

like opinfo_get() and proc_show_files().

Since there is no RCU grace period delay between nullifying the pointer

and freeing the memory, a reader can still access oplock_info

structure after it has been freed. This can leads to a use-after-free

especially in opinfo_get() where atomic_inc_not_zero() is called on

already freed memory.

Fix this by switching to deferred freeing using call_rcu().

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/08aa9f3c8cf4d0bee44df540dfe34e8d64069f2cRefgit.kernel.org/stable/c/1d6abf145615dbfe267ce3b0a271f95e3780e18eRefgit.kernel.org/stable/c/1dfd062caa165ec9d7ee0823087930f3ab8a6294Refgit.kernel.org/stable/c/302fef75512b2c8329a3f5efab1ae7ba2562387aRefgit.kernel.org/stable/c/ce8507ee82c888126d8e7565e27c016308d24cde

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43376?

CVE-2026-43376 is a critical-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-43376?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-43376?

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-2026-43376?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43376 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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