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CVE-2026-45934VulnerabilityPublished Updated

Microsoft · btrfs: fix EEXIST abort due to non-consecutive gaps in chunk allocation

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-45934· Medium

Not known to be exploited · fixed in b14c5e04bd0f722ed631845599d52d03fcae1bc1 : update Microsoft when convenient.

Data as of 30 Oct 2026, 11:52 UTC

Severity
Medium

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
EPSS
0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in b14c5e04bd0f722ed631845599d52d03fcae1bc1, 09207c3975e1f8f76a52472004dfcab997b4cbd6, 156cac365e27a82b64ae510c5f463fd81f0265b1 +3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 27 May 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 30 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 1b9845081633072c18f30d8cfd09c267adf0b109, < b14c5e04bd0f722ed631845599d52d03fcae1bc1
Fixed in
  • b14c5e04bd0f722ed631845599d52d03fcae1bc1
LinuxLinuxAffected
  • ≥ 1b9845081633072c18f30d8cfd09c267adf0b109, < 09207c3975e1f8f76a52472004dfcab997b4cbd6
Fixed in
  • 09207c3975e1f8f76a52472004dfcab997b4cbd6
LinuxLinuxAffected
  • ≥ 1b9845081633072c18f30d8cfd09c267adf0b109, < 156cac365e27a82b64ae510c5f463fd81f0265b1
Fixed in
  • 156cac365e27a82b64ae510c5f463fd81f0265b1
LinuxLinuxAffected
  • ≥ 1b9845081633072c18f30d8cfd09c267adf0b109, < 12addb8ab5eec94098d4c7c6614830ccbe7ad130
Fixed in
  • 12addb8ab5eec94098d4c7c6614830ccbe7ad130
LinuxLinuxAffected
  • ≥ 1b9845081633072c18f30d8cfd09c267adf0b109, < 8f01e82c58f40739dfec32fc83dfd66711d473b9
Fixed in
  • 8f01e82c58f40739dfec32fc83dfd66711d473b9
LinuxLinuxAffected
  • ≥ 1b9845081633072c18f30d8cfd09c267adf0b109, < 7d4eadee7042d27fcea659fcdd738f463a7d2e70
Fixed in
  • 7d4eadee7042d27fcea659fcdd738f463a7d2e70

Description

This vulnerability involves the btrfs filesystem where an EEXIST abort occurs due to non-consecutive gaps in chunk allocation. It affects version 3.0 of the Microsoft product. No CVSS score or detailed technical impact information is provided. There is no indication of known exploits in the wild or a vendor patch advisory at this time.

References

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