A failed upgrade may lead to hung goroutines
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub.
Summary
### Impact Processes using tableflip may encounter hung goroutines in the parent process, after a failed upgrade. The Go runtime has annoying behaviour around setting and clearing O_NONBLOCK: exec.Cmd.Start() ends up calling os.File.Fd() for any file in exec.Cmd.ExtraFiles. os.File.Fd() disables both the use of the runtime poller for the file and clears O_NONBLOCK from the underlying open file descriptor. This can lead to goroutines hanging in a parent process, after at least one failed upgrade. The bug manifests in goroutines which rely on either a deadline or interruption via Close() to be unblocked being stuck in read or accept like syscalls. As far as I can tell we've not experienced this problem in production, so it's most likely quite rare. ### Patches The problem has been fixed in v1.2.2. ### Workarounds None. ### References * https://github.com/cloudflare/tableflip/commit/cae714b289e199db5da5f08af861ea65be6232c0
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | github.com/cloudflare/tableflip (Go) | before 1.2.2 | 1.2.2 | Patch available | GHSA-gmq2-39ff-f5qg |
- github.com/cloudflare/tableflip (Go) Vendor— Affected before 1.2.2 Fixed in 1.2.2 Patch available GHSA-gmq2-39ff-f5qg
Remediation
- Fix · GHSA-gmq2-39ff-f5qg github.com/cloudflare/tableflip (Go) Fixed in 1.2.2 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-gmq2-39ff-f5qg
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences