CVE-2023-49298

OpenZFS through 2.1.13 and 2.2.x through 2.2.1, in certain scenarios
involving applications that try to rely on efficient copying of file data,
can replace file contents with zero-valued bytes and thus potentially
disable security mechanisms. NOTE: this issue is not always security
related, but can be security related in realistic situations. A possible
example is cp, from a recent GNU Core Utilities (coreutils) version, when
attempting to preserve a rule set for denying unauthorized access. (One
might use cp when configuring access control, such as with the
/etc/hosts.deny file specified in the IBM Support reference.) NOTE: this
issue occurs less often in version 2.2.1, and in versions before 2.1.4,
because of the default configuration in those versions.

Bugs

• <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1056752&gt;
• <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275308&gt;
• <https://github.com/openzfs/zfs/issues/15526&gt;
• <https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/2044657&gt;

Notes