Linux Kernel ksmbd Lease Break/Ack State Handling Flaw
CVE-2026-98901 Published on October 23, 2026

ksmbd: fix lease break and ack state handling
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.

NVD

Products Associated with CVE-2026-98901

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Affected Versions

• Version e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and below 17699905a381621c1cee5b6528feb05acedc86a4 is affected.
• Version e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and below 3251ea36df5eef58aa207fbee48849d89b922ea6 is affected.
• Version e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and below fba4653a0b4dc2f6d42600abe21fb326292f70ff is affected.
• Version e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and below 5015191096db311759fef98769270336cd8b1324 is affected.

• Version 5.15 is affected.
• Before 5.15 is unaffected.
• Version 6.6.158, <= 6.6.* is unaffected.
• Version 6.12.111, <= 6.12.* is unaffected.
• Version 6.18.53, <= 6.18.* is unaffected.
• Version 7.2, <= * is unaffected.