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CVE-2026-43308VulnerabilityPublished Updated

Microsoft · btrfs: don't BUG() on unexpected delayed ref type in run_one_delayed_ref()

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-43308· Medium

Not known to be exploited · fixed in c614b64bee2c3cbb0c80dd3a9ee492c74364e275 : update Microsoft when convenient.

Data as of 1 Nov 2026, 22:58 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 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in c614b64bee2c3cbb0c80dd3a9ee492c74364e275, c7d1d4ff56744074e005771aff193b927392d51f, a5ac87aabdedd31e832b40466605e83f428136aa +3

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 1 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0, < c614b64bee2c3cbb0c80dd3a9ee492c74364e275
Fixed in
  • c614b64bee2c3cbb0c80dd3a9ee492c74364e275
LinuxLinuxAffected
  • ≥ 5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0, < c7d1d4ff56744074e005771aff193b927392d51f
Fixed in
  • c7d1d4ff56744074e005771aff193b927392d51f
LinuxLinuxAffected
  • ≥ 5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0, < a5ac87aabdedd31e832b40466605e83f428136aa
Fixed in
  • a5ac87aabdedd31e832b40466605e83f428136aa
LinuxLinuxAffected
  • ≥ 5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0, < 5549743e11c06da23cfa7712a994b9f1e69064c6
Fixed in
  • 5549743e11c06da23cfa7712a994b9f1e69064c6
LinuxLinuxAffected
  • ≥ 5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0, < 6ad4caadc6343c3d7987bf3211f15d66135c4c42
Fixed in
  • 6ad4caadc6343c3d7987bf3211f15d66135c4c42
LinuxLinuxAffected
  • ≥ 5d4f98a28c7d334091c1b7744f48a1acdd2a4ae0, < 0e77f1c8ebf5b1f858b5ac613baceb79919d6d3f
Fixed in
  • 0e77f1c8ebf5b1f858b5ac613baceb79919d6d3f

Description

CVE-2026-43308 is a vulnerability related to the btrfs filesystem in the Linux kernel, specifically involving an unexpected delayed reference type in the run_one_delayed_ref() function. The vulnerability is identified by Microsoft Security Response Center and affects Microsoft Azure Linux kernel version 3.0. No CVSS score or detailed technical exploitation information is provided.

References

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