CVE-2026-64359: nilfs2: reject CLEAN_SEGMENTS ioctl with out-of-range segment numbers
CSIRTS triage
- What
- The nilfs2 filesystem rejects CLEAN_SEGMENTS ioctl with out-of-range segment numbers.
- Who is affected
- Deployments of the nilfs2 filesystem are affected.
- Urgency
- Remediation is necessary to prevent potential exploitation, although exploitation status is currently unknown.
- Action
- Update to the latest version of the nilfs2 filesystem.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64359
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-643590.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-64359 | coverage & exploitation status | NVD · CVE.org |
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