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CVE-2026-99256VulnerabilityPublished Updated

Microsoft · dm cache: fix issue with background work locking

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-99256· Medium

Not known to be exploited · fixed in f5db935d257023c3ef410bd39163b949b0e5a55d : update Microsoft when convenient.

Data as of 7 Nov 2026, 12:18 UTC

Severity
Medium

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in f5db935d257023c3ef410bd39163b949b0e5a55d, bc9781c0247de107876f32929f1637db93a42b34, 6290507ecc0dd6dd40759729cbbbd49b1d2a63c4 +5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Nov 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
  • ≥ b29d4986d0da1a27cd35917cdb433672f5c95d7f, < f5db935d257023c3ef410bd39163b949b0e5a55d
Fixed in
  • f5db935d257023c3ef410bd39163b949b0e5a55d
LinuxLinuxAffected
  • ≥ b29d4986d0da1a27cd35917cdb433672f5c95d7f, < bc9781c0247de107876f32929f1637db93a42b34
Fixed in
  • bc9781c0247de107876f32929f1637db93a42b34
LinuxLinuxAffected
  • ≥ b29d4986d0da1a27cd35917cdb433672f5c95d7f, < 6290507ecc0dd6dd40759729cbbbd49b1d2a63c4
Fixed in
  • 6290507ecc0dd6dd40759729cbbbd49b1d2a63c4
LinuxLinuxAffected
  • ≥ b29d4986d0da1a27cd35917cdb433672f5c95d7f, < 8433fd005c25fd127021f67c9144a879fb585572
Fixed in
  • 8433fd005c25fd127021f67c9144a879fb585572
LinuxLinuxAffected
  • ≥ b29d4986d0da1a27cd35917cdb433672f5c95d7f, < 104f09e02038b0fc6bbb718b3976af029e15c1d0
Fixed in
  • 104f09e02038b0fc6bbb718b3976af029e15c1d0
LinuxLinuxAffected
  • ≥ b29d4986d0da1a27cd35917cdb433672f5c95d7f, < 73df2ff409f3db95029982fe3656329568e3715d
Fixed in
  • 73df2ff409f3db95029982fe3656329568e3715d

Description

To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

References

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