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

CVE-2026-98901 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-98901, released October 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-98901
- Priority: Routine
- CVSS: 5.4 (Moderate)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 23, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98901

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.111-1 | [DEBIAN-CVE-2026-98901](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98901.md) | Oct 24, 2026 |
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-98901](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98901.md) | Oct 24, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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