CVE-2026-49429 Kernel heap overflow in ZFS_IOC_USERSPACE_MANY ioctl

The ZFSIOCUSERSPACEMANY ioctl, used by zfs-userspace8, 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 he...

EUVD-2026-62239

The ZFSIOCUSERSPACEMANY ioctl, used by zfs-userspace8, 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 he...

CVE-2026-49429 Kernel heap overflow in ZFS_IOC_USERSPACE_MANY ioctl

The ZFSIOCUSERSPACEMANY ioctl, used by zfs-userspace8, 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 he...

CVE-2026-49429: Heap-based Buffer Overflow

The ZFSIOCUSERSPACEMANY ioctl, used by zfs-userspace8, 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 he...

OpenZFS Heap Buffer Overflow Privilege Escalation

The vulnerability of the zfsiocuserspacemany function in the OpenZFS component of FreeBSD operating systems is related to buffer overflow in dynamic memory. Exploiting this vulnerability could allow an attacker to gain increased privileges...