Roger Pau Monne discovered that Xen block and network PV device
frontends don't zero out memory regions before sharing them with the
backend, which may result in information disclosure. Additionally it
was discovered that the granularity of the grant table doesn't permit
sharing less than a 4k page, which may also result in information
Jan Beulich discovered that incorrect memory handling in the Xen
network backend may lead to denial of service.
Oleksandr Tyshchenko discovered that ARM Xen guests can cause a denial
of service to the Dom0 via paravirtual devices.
Arthur Mongodin discovered a heap buffer overflow in the Netfilter
subsystem which may result in local privilege escalation.
For the stable distribution (bullseye), these problems have been fixed in version 5.10.127-2.
We recommend that you upgrade your linux packages.