CVE-2026-98115 ksmbd: safely drain sessions during logoff

What is CVE-2026-98115?

CVE-2026-98115 is a high-severity vulnerability in Linux kernel, published on 25 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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

ksmbd: safely drain sessions during logoff

SMB3 multichannel allows requests for one session to run on multiple connections. Wait for all channels bound to a session before freeing shared session objects.

A deferred byte-range lock remains counted as a running request and only wakes when its file closes. Wake blocked locks during the drain without unpublishing or modifying their file objects. Synchronous CANCEL requests must invoke their cancellation callback to wake pending operations, while CHANGE_NOTIFY completion remains specific to the asynchronous path.

Serialize session teardown with channel registration and previous-session cleanup, and use atomic work-state transitions so LOGOFF, CANCEL, and connection teardown invoke cancellation callbacks only once.

Weakness: CWE-362

Which versions are affected by CVE-2026-98115?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-98115?

Apply the vendor's patch.

Is CVE-2026-98115 being exploited?

There is no known exploitation of CVE-2026-98115 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-104675, BELL-CVE-2026-98115, DEBIAN-CVE-2026-98115, GHSA-pwwp-xv6g-3r4c, UBUNTU-CVE-2026-98115.