Vulnerability intelligence

CVE-2026-49429

The ZFS_IOC_USERSPACE_MANY ioctl, used by zfs-userspace(8), truncated a 64-bit output buffer size to a 32-bit integer for the kernel allocation, but used the original 64-bit size as the buffer limit when writing records. A local user with the "userused" delegated ZFS permission can trigger a kernel heap overflow via the ZFS_IOC_USERSPACE_MANY ioctl, potentially escalating privileges.

CVSS Score

—

Unrated

EPSS — Exploit Probability

0.0%

Riskier than 0% of all CVEs

Exploitation

Not in CISA KEV

No federal exploitation record

Remediation

unknown

Check vendor advisories

NVD entry

1 article across 1 outlet · first covered Jul 6, 2026 · latest Jul 6, 2026

Coverage timeline

FreeBSD Security Advisories Detail Critical Vulnerabilities
securityonline.info · Jul 6, 2026