When tcpdump is configured by -Z root to not drop root privileges (as documented in the man page) and write to a pcap file, it segfaults on start. This seems to be an interaction of the downstream patch delaying the dropping of root privileges and the following upstream change included in tcpdump-4.99.5 setting the username variable to NULL: https://github.com/the-tcpdump-group/tcpdump/commit/75866fb1db0b52ce70940e113e48fa353fb00d1e Reproducible: Always
Here is a PR to fix the downstream patch: https://src.fedoraproject.org/rpms/tcpdump/pull-request/9
This bug appears to have been reported against 'rawhide' during the Fedora Linux 42 development cycle. Changing version to 42.
FEDORA-2026-0bd5fbaa7d (tcpdump-4.99.6-2.fc42) has been submitted as an update to Fedora 42. https://bodhi.fedoraproject.org/updates/FEDORA-2026-0bd5fbaa7d
FEDORA-2026-62cb5273ef (tcpdump-4.99.6-2.fc43) has been submitted as an update to Fedora 43. https://bodhi.fedoraproject.org/updates/FEDORA-2026-62cb5273ef
FEDORA-2026-0bd5fbaa7d has been pushed to the Fedora 42 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-0bd5fbaa7d` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-0bd5fbaa7d See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-2026-62cb5273ef has been pushed to the Fedora 43 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-62cb5273ef` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-62cb5273ef See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-2026-62cb5273ef (tcpdump-4.99.6-2.fc43) has been pushed to the Fedora 43 stable repository. If problem still persists, please make note of it in this bug report.
FEDORA-2026-0bd5fbaa7d (tcpdump-4.99.6-2.fc42) has been pushed to the Fedora 42 stable repository. If problem still persists, please make note of it in this bug report.