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

Unscored severity · published Oct 23, 2026

CVE-2026-98901

ksmbd: fix lease break and ack state handling

–

CVSS

0.2%

EPSS

On KEV

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.

Exploitation

Is it being used?

Exploit prediction (EPSS)0.2% · higher than 7% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Linux · Linux

e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 17699905a381621c1cee5b6528feb05acedc86a4; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 3251ea36df5eef58aa207fbee48849d89b922ea6; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before fba4653a0b4dc2f6d42600abe21fb326292f70ff; e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 5015191096db311759fef98769270336cd8b1324; 5.15 · source: vendor

Affected product

Linux

All Linux CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-98901

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-98901

git.kernel.org

https://git.kernel.org/stable/c/17699905a381621c1cee5b6528feb05acedc86a4

git.kernel.org

https://git.kernel.org/stable/c/3251ea36df5eef58aa207fbee48849d89b922ea6

git.kernel.org

https://git.kernel.org/stable/c/5015191096db311759fef98769270336cd8b1324

git.kernel.org

https://git.kernel.org/stable/c/fba4653a0b4dc2f6d42600abe21fb326292f70ff