Am Samstag, dem 11.09.2021 um 03:49 -0500 schrieb Matt Roberds: > Package: qemu-system-x86 > Version: 1:2.8+dfsg-6+deb9u15 > Severity: important > X-Debbugs-Cc: debian-lts@lists.debian.org > > Hello all! > > Quick version: > ============== > > I recently upgraded the qemu packages on my host from > 1:2.8+dfsg-6+deb9u14 to 1:2.8+dfsg-6+deb9u15 , but this breaks user-mode > networking in the guest. This is reproducible; going back to deb9u14 on > the host makes user-mode networking work again in the guest, and going > forward to deb9u15 breaks user-mode networking again in the guest. Hello Michael, hello Matt thanks for the report. I can reproduce the problem and I believe the patch for CVE-2021-3592 introduced it. On my system I also get an IP address when I use ifup/ifdown and DCHP appears to be working. However I experience the same "Network is unreachable" error when I try to ssh into the host system. I have backported all relevant functions now (dhcp_decode, bootp_reply and bootp_input) but the problem still exists. It probably has something to do with the removal of the optional structure field DHCP_OPT_LEN. Since I do not have an imminent solution for this issue, I intend to revert the patch for CVE-2021- 3592. I will release a regression update shortly. Regards, Markus
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