A Linux entropy source using the HAVEGE algorithm
Haveged is a user space entropy daemon which is not dependent upon the
standard mechanisms for harvesting randomness for the system entropy
pool. This is important in systems with high entropy needs or limited
user interaction (e.g. headless servers).
Haveged uses HAVEGE (HArdware Volatile Entropy Gathering and Expansion)
to maintain a 1M pool of random bytes used to fill /dev/random
whenever the supply of random bits in /dev/random falls below the low
water mark of the device. The principle inputs to haveged are the
sizes of the processor instruction and data caches used to setup the
HAVEGE collector. The haveged default is a 4kb data cache and a 16kb
instruction cache. On machines with a cpuid instruction, haveged will
attempt to select appropriate values from internal tables.
Update Information:
Update to 1.9.22 \u2014 fix systemd sandboxing: add ReadWritePaths=/dev/shm for semaphore creation Backport fix for CVE-2026-41054: privilege escalation via command socket
* Thu May 21 2026 Jirka Hladky
[ 1 ] Bug #2480051 - CVE-2026-41054 haveged: privilege escalation via command socket
https://bugzilla.redhat.com/show_bug.cgi?id=2480051
This update can be installed with the "dnf" update program. Use su -c 'dnf upgrade --advisory FEDORA-2026-5d9b0e2c17' at the command line. For more information, refer to the dnf documentation available at http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label
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