Debian 11: DLA-4221-1 critical: libblockdev local privilege escalation

The Qualys Threat Research Unit (TRU) discovered a local privilege
escalation vulnerability in libblockdev, a library for manipulating
block devices. An "allow_active" user can exploit this flaw via the
udisks daemon to obtain the full privileges of the root user.

Details can be found in the Qualys advisory at
https://cdn2.qualys.com/2025/06/17/suse15-pam-udisks-lpe.txt

Along with the libblockdev update, updated udisks2 packages are
released, to enforce that private mounts are mounted with
'nodev,nosuid'.


For Debian 11 bullseye, this problem has been fixed in version
2.25-2+deb11u1.

We recommend that you upgrade your libblockdev packages.

For the detailed security status of libblockdev please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/libblockdev

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS