Bug 2559600 (CVE-2026-98901) - CVE-2026-98901 kernel: ksmbd: fix lease break and ack state handling
Summary: CVE-2026-98901 kernel: ksmbd: fix lease break and ack state handling
Keywords:
Status: NEW
Alias: CVE-2026-98901
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-23 12:24 UTC by OSIDB Bzimport
Modified: 2026-11-09 11:56 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-10-23 12:24:32 UTC 
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.
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