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CVE-2026-89567VulnerabilityPublished Updated

Microsoft · jbd2: bound shrinker scans by examined checkpoint buffers

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-89567· Medium

Not known to be exploited · fixed in edf5fcd0469b7467bd5b37a79502c8d9c3257dbb : 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

Patch
Available – fixed in edf5fcd0469b7467bd5b37a79502c8d9c3257dbb, c2c0fb364685b8996c357d3b050394959b29d6e0, 71c6b872c746465fa4b5def239cb296173ca8216 +5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 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
  • >=5.15.129 <5.16
  • >=6.1.50 <6.2
  • >=6.4.13 <6.5
Fixed in
  • edf5fcd0469b7467bd5b37a79502c8d9c3257dbb
  • c2c0fb364685b8996c357d3b050394959b29d6e0
  • 71c6b872c746465fa4b5def239cb296173ca8216
  • 15cb16496446b94e67f7abcb049b8e2c75cd3d02
  • 6b5366ba63a58819396045ab146bd37ff9e503c6
  • 6.5
  • 6.2
  • 5.16
LinuxLinuxAffected
  • =6.5
Fixed in–

Description

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

References

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