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CVE-2026-98901VulnerabilityPublished Updated

Microsoft · ksmbd: fix lease break and ack state handling

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-98901

Not known to be exploited · fixed in fba4653a0b4dc2f6d42600abe21fb326292f70ff : update Microsoft when convenient.

Data as of 2 Nov 2026, 10:58 UTC

Severity
Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
EPSS
0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in fba4653a0b4dc2f6d42600abe21fb326292f70ff, 5015191096db311759fef98769270336cd8b1324, 17699905a381621c1cee5b6528feb05acedc86a4 +1

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 23 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2 Nov 2026.

What to do

Upgrade Linux to fba4653a0b4dc2f6d42600abe21fb326292f70ff, 5015191096db311759fef98769270336cd8b1324, 17699905a381621c1cee5b6528feb05acedc86a4 or 3251ea36df5eef58aa207fbee48849d89b922ea6.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < fba4653a0b4dc2f6d42600abe21fb326292f70ff
Fixed in
  • fba4653a0b4dc2f6d42600abe21fb326292f70ff
LinuxLinuxAffected
  • ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 5015191096db311759fef98769270336cd8b1324
Fixed in
  • 5015191096db311759fef98769270336cd8b1324
LinuxLinuxAffected
  • ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 17699905a381621c1cee5b6528feb05acedc86a4
Fixed in
  • 17699905a381621c1cee5b6528feb05acedc86a4
LinuxLinuxAffected
  • ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 3251ea36df5eef58aa207fbee48849d89b922ea6
Fixed in
  • 3251ea36df5eef58aa207fbee48849d89b922ea6
LinuxLinuxAffected
  • =5.15
Fixed in–

Description

This vulnerability concerns the ksmbd component and involves fixes related to lease break and acknowledgment state handling. It affects Microsoft products specifically versions 3.0 and 4.0. No CVSS score or detailed impact information is provided in the available data.

References

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