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CVE-2026-90265VulnerabilityPublished Updated

Microsoft · btrfs: defrag: fix deadlock between defrag and delalloc space reservation

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-90265· Medium

Not known to be exploited · fixed in c97277aa6ce8ac725642aced0fe20cd8d31f6e09 : 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 c97277aa6ce8ac725642aced0fe20cd8d31f6e09, ba02eab28041f9a4bbe9fc90c7249644fef6de0f, ac916391e1c70801649f7d6f85014f687983bc33 +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
  • ≥ 22b398eeeed43d51e85b1008e51bf9663ac1f491, < c97277aa6ce8ac725642aced0fe20cd8d31f6e09
Fixed in
  • c97277aa6ce8ac725642aced0fe20cd8d31f6e09
LinuxLinuxAffected
  • ≥ 22b398eeeed43d51e85b1008e51bf9663ac1f491, < ba02eab28041f9a4bbe9fc90c7249644fef6de0f
Fixed in
  • ba02eab28041f9a4bbe9fc90c7249644fef6de0f
LinuxLinuxAffected
  • ≥ 22b398eeeed43d51e85b1008e51bf9663ac1f491, < ac916391e1c70801649f7d6f85014f687983bc33
Fixed in
  • ac916391e1c70801649f7d6f85014f687983bc33
LinuxLinuxAffected
  • ≥ 22b398eeeed43d51e85b1008e51bf9663ac1f491, < a9701dd06e82c345fe70debdf8835b7eb5000c59
Fixed in
  • a9701dd06e82c345fe70debdf8835b7eb5000c59
LinuxLinuxAffected
  • ≥ 22b398eeeed43d51e85b1008e51bf9663ac1f491, < 37614074596827a5f292243673b699c90ff63e7d
Fixed in
  • 37614074596827a5f292243673b699c90ff63e7d
LinuxLinuxAffected
  • ≥ 22b398eeeed43d51e85b1008e51bf9663ac1f491, < 046396bd16fdf0a9fbdf5f04c6eda26024e7695e
Fixed in
  • 046396bd16fdf0a9fbdf5f04c6eda26024e7695e

Description

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

References

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