Microsoft · btrfs: don't BUG() on unexpected delayed ref type in run_one_delayed_ref()
Affects MicrosoftSource GCVE Database
Not known to be exploited · fixed in c614b64bee2c3cbb0c80dd3a9ee492c74364e275 : update Microsoft when convenient.
Data as of 1 Nov 2026, 22:58 UTC
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
Disclosed: evidence found.
CVE published 8 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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.