CVE-2026-98901 ksmbd: fix lease break and ack state handling

Not scored Published 23 Oct 2026 Updated 26 Oct 2026

Exploited in the wild: Not known
Fix: Available

What is CVE-2026-98901?

CVE-2026-98901 is a vulnerability in Linux, published on 23 Oct 2026.

Official description

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

ksmbd: fix lease break and ack state handling

Do not skip valid lease states containing WRITE_CACHING when breaking level-II/read leases for writes and truncates.

Handle lease break acknowledgments according to the SMB2 rule that the acknowledged state must be a subset of the server's break target. Apply the acknowledged state directly and keep the break pending on failed ACKs.

Which versions are affected by CVE-2026-98901?

How do I fix CVE-2026-98901?

Upgrade to a fixed version.

Is CVE-2026-98901 being exploited?

There is no known exploitation of CVE-2026-98901 in the wild and no public exploit code.

Sources

Also known as AZL-110659, BELL-CVE-2026-98901, DEBIAN-CVE-2026-98901, GHSA-6w2x-j37m-r6r9, UBUNTU-CVE-2026-98901.