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CVE-2026-43299VulnerabilityPublished Updated

Microsoft · btrfs: do not ASSERT() when the fs flips RO inside btrfs_repair_io_failure()

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-43299· High

Not known to be exploited · fixed in f6df18c001e3dcebc08482d0adeacd0cfea08593 : patch Microsoft soon.

Data as of 30 Oct 2026, 06:59 UTC

Severity
High

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

EPSS
0.1% chance of exploitation in 30 days – higher than 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in f6df18c001e3dcebc08482d0adeacd0cfea08593, da3f596073de1c3cbc99941f01296968a85c8c76, a35b38cb4b0dd08d7cc0bd4e400208c7aeba8a72 +2

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 8 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 29 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 908960c6c0fb3b3ce3971dc0ca47b581d256b968, < f6df18c001e3dcebc08482d0adeacd0cfea08593
Fixed in
  • f6df18c001e3dcebc08482d0adeacd0cfea08593
LinuxLinuxAffected
  • ≥ 908960c6c0fb3b3ce3971dc0ca47b581d256b968, < da3f596073de1c3cbc99941f01296968a85c8c76
Fixed in
  • da3f596073de1c3cbc99941f01296968a85c8c76
LinuxLinuxAffected
  • ≥ 908960c6c0fb3b3ce3971dc0ca47b581d256b968, < a35b38cb4b0dd08d7cc0bd4e400208c7aeba8a72
Fixed in
  • a35b38cb4b0dd08d7cc0bd4e400208c7aeba8a72
LinuxLinuxAffected
  • ≥ 908960c6c0fb3b3ce3971dc0ca47b581d256b968, < 81e1ae665004b99a10686473d99f0a7cb6335f38
Fixed in
  • 81e1ae665004b99a10686473d99f0a7cb6335f38
LinuxLinuxAffected
  • ≥ 908960c6c0fb3b3ce3971dc0ca47b581d256b968, < 8ceaad6cd6e7fa5f73b0b2796a2e85d75d37e9f3
Fixed in
  • 8ceaad6cd6e7fa5f73b0b2796a2e85d75d37e9f3
LinuxLinuxAffected
  • =3.13
Fixed in–

Description

CVE-2026-43299 is a vulnerability related to the btrfs filesystem where an assertion failure occurs when the filesystem flips to read-only mode inside the btrfs_repair_io_failure() function. The issue affects version 3.0 of the Microsoft product. No CVSS score or detailed impact information is provided, and no known exploits are reported. There is no information on available patches or vendor advisories regarding remediation.

References

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