Xen lack of preemption in evtchn_reset() / evtchn_destroy() DoS (XSA-344)

A denial of service DoS vulnerability exists in Xen servers in FIFO event channel modules evtchnreset / evtchndestroy due to a lack of preemption. An authenticated, local attacker can mount a Denial of Service DoS attack affecting the entire system. Note that Nessus has not tested for this issue...

Fedora 31 : xen (2020-d46fe34349)

x86 pv: Crash when handling guest access to MSRMISCENABLE XSA-333, CVE-2020-25602 1881619 Missing unlock in XENMEMacquireresource error path XSA-334, CVE-2020-25598 1881616 race when migrating timers between x86 HVM vCPU-s XSA-336, CVE-2020-25604 1881618 PCI passthrough code reading back hardware...

Security update for xen (important)

openSUSE Security Update: Security update for xen Announcement ID: openSUSE-SU-2020:1608-1 Rating: important References: 1027519 1176339 1176341 1176343 1176344 1176345 1176346 1176347 1176348 1176349 1176350 Cross-References: CVE-2020-25595 CVE-2020-25596 CVE-2020-25597 CVE-2020-25598...