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CVE-2026-74571VulnerabilityPublished Updated

Microsoft · btrfs: skip global block reserve accounting for rescue mounts

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-74571· High

Not known to be exploited · fixed in ca05d9abde2195cec3d07d0d4d65152d8171078f : patch Microsoft soon.

Data as of 7 Nov 2026, 12:47 UTC

Severity
High

Rated by Threat Radar · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in ca05d9abde2195cec3d07d0d4d65152d8171078f, aa72cc4675240ab6b01ec72ac6a1fe832e715569, 076349e4c8d11f6b58c4549976a513b2b4dc6df2 +5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 Aug 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
  • >=6.1.43 <6.1.191
  • >=6.4.8 <6.5
Fixed in
  • ca05d9abde2195cec3d07d0d4d65152d8171078f
  • aa72cc4675240ab6b01ec72ac6a1fe832e715569
  • 076349e4c8d11f6b58c4549976a513b2b4dc6df2
  • 969a96479add6bd42d7f7241f99f27b31571a953
  • 51a0e8399858621442807a26057bcd1cd3ced046
  • 6.5
  • 6.1.191
  • 3a69fae2371a5ee190d4c4bbe5304a753558c1c6
LinuxLinuxAffected
  • =6.5
Fixed in–

Description

CVE-2026-74571 concerns a vulnerability related to the btrfs filesystem where global block reserve accounting is skipped during rescue mounts. The information provided is minimal and does not detail the impact or exploitation methods.

References

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