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CVE-2026-90156VulnerabilityPublished Updated

Microsoft · ksmbd: safely discard unregistered deferred locks

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-90156· Medium

Not known to be exploited · fixed in ecdcfa15b3d799476c685cecd433ebefc93015c8 : update Microsoft when convenient.

Data as of 7 Nov 2026, 13:47 UTC

Severity
Medium

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in ecdcfa15b3d799476c685cecd433ebefc93015c8, d09af9a35ff7b77a950b507133d9092aadbfeff4, aaa51ac0d934cb4e2ab96e150fccc934e822009b +3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 17 Sep 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 7 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < ecdcfa15b3d799476c685cecd433ebefc93015c8
Fixed in
  • ecdcfa15b3d799476c685cecd433ebefc93015c8
LinuxLinuxAffected
  • ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < d09af9a35ff7b77a950b507133d9092aadbfeff4
Fixed in
  • d09af9a35ff7b77a950b507133d9092aadbfeff4
LinuxLinuxAffected
  • ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < aaa51ac0d934cb4e2ab96e150fccc934e822009b
Fixed in
  • aaa51ac0d934cb4e2ab96e150fccc934e822009b
LinuxLinuxAffected
  • ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 77413400f083a959724de6f36348c9677ef9873a
Fixed in
  • 77413400f083a959724de6f36348c9677ef9873a
LinuxLinuxAffected
  • ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 054bcca4cd9f00719b01f7108b51a2168fb94f15
Fixed in
  • 054bcca4cd9f00719b01f7108b51a2168fb94f15
LinuxLinuxAffected
  • ≥ e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9, < 52b91bc5253bb83665f3ea70565d0b2487dae643
Fixed in
  • 52b91bc5253bb83665f3ea70565d0b2487dae643

AI-suggested

No official fixes or workarounds are provided in the available information.

Description

CVE-2026-90156 concerns a vulnerability in the ksmbd component related to the safe handling of unregistered deferred locks. The provided information does not include technical details about the nature of the flaw, its impact, or exploitation methods. The affected versions are 3.0 and 4.0. No CVSS score or vendor advisory details are available to clarify the severity or remediation status.

References

Community reviews

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