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CVE-2026-98261

8.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: cifs: Fix server use-after-free in cifs_chan_skip_or_disable() When a secondary channel is no longer supported by the server, c…

Published Oct 6, 2026EPSS 0.40%

Overview

CVE-2026-98261 is a high-severity vulnerability. It was published on October 6, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. 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:

cifs: Fix server use-after-free in cifs_chan_skip_or_disable()

When a secondary channel is no longer supported by the server,

cifs_chan_skip_or_disable() drops the channel reference with

cifs_put_tcp_session() and then continues to use the server pointer by

calling cifs_signal_cifsd_for_reconnect() on it and reading its

primary_server pointer. cifs_put_tcp_session() can drop the last

reference of the channel and tear it down, so both the channel and the

primary server (whose reference is also dropped by

cifs_put_tcp_session()) can be freed before they are signaled for

reconnect.

Signal the channel and the primary server and capture the primary

server pointer before dropping the channel reference with

cifs_put_tcp_session().

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/0338489960ddad6368bce55e8adbc176c523093dRefgit.kernel.org/stable/c/717e0a25036b6c92cecace30913b2d874a4c22b8Refgit.kernel.org/stable/c/7a1b27780b113583a94256d58dabfe7c0d9286e7Refgit.kernel.org/stable/c/edd52eae5fcfb8433b6bb0e7cd98db438fe01227Refgit.kernel.org/stable/c/fcc0a935bb6e37ecbf7e4335061309f896f35780

How CyberStrike helps

Frequently asked questions

What is CVE-2026-98261?

CVE-2026-98261 is a high-severity vulnerability. It was published on October 6, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-98261?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-98261?

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-2026-98261?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-98261 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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