Unknown

CVE-2026-98901 — 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.

Published Oct 23, 2026 · Updated Oct 23, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

No scoring signals.

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

—

No EPSS score.

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 17699905a381621c1cee5b6528feb05acedc86a4≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 3251ea36df5eef58aa207fbee48849d89b922ea6≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < fba4653a0b4dc2f6d42600abe21fb326292f70ff≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and < 5015191096db311759fef98769270336cd8b1324< 6.6.158< 6.12.111< 6.18.53versions not specified by the source	Vulnerable	CVE Program (cve.org) e CISA ADP

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 23, 2026
Affected products added · linux/linux
Oct 23, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 23, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 23, 2026 · Alertas do Telegram
CVE published
Oct 23, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 23, 2026 – Oct 23, 2026
1× Official description updated · Oct 23, 2026 – Oct 23, 2026

References

4 on the record

git.kernel.org/stable/c/3251ea36df5eef58aa207fbee48849d89b922ea6
NIST National Vulnerability Database
git.kernel.org/stable/c/17699905a381621c1cee5b6528feb05acedc86a4
NIST National Vulnerability Database
git.kernel.org/stable/c/fba4653a0b4dc2f6d42600abe21fb326292f70ff
NIST National Vulnerability Database
git.kernel.org/stable/c/5015191096db311759fef98769270336cd8b1324
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-99087 dm-integrity: fix NULL pointer dereference when the 'R' flag is used 1h
Unknown CVE-2026-99086 dm-integrity: validate the superblock on resume 1h
Unknown CVE-2026-99085 sched_ext: Fix CPU hotplug hang when a dying CPU's tasks sit in the BPF scheduler 1h
Unknown CVE-2026-99084 readdir: take no inode lock on an immutable directory 1h
Unknown CVE-2026-99083 ksmbd: fix heap out-of-bounds write in krb5_authenticate() 1h
Unknown CVE-2026-99082 KVM: x86: Use active memslots for the per-vCPU MMIO cache 1h

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No FIRST EPSS score.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-98901 is "ksmbd: fix lease break and ack state handling", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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