Debian Security Advisory DSA-5050-1 Critical: Kernel Escalation and DoS

CVE-2021-4155

Kirill Tkhai discovered a data leak in the way the XFS_IOC_ALLOCSP
IOCTL in the XFS filesystem allowed for a size increase of files
with unaligned size. A local attacker can take advantage of this
flaw to leak data on the XFS filesystem.

CVE-2021-28711, CVE-2021-28712, CVE-2021-28713 (XSA-391)

Juergen Gross reported that malicious PV backends can cause a denial
of service to guests being serviced by those backends via high
frequency events, even if those backends are running in a less
privileged environment.

CVE-2021-28714, CVE-2021-28715 (XSA-392)

Juergen Gross discovered that Xen guests can force the Linux
netback driver to hog large amounts of kernel memory, resulting in
denial of service.

CVE-2021-39685

Szymon Heidrich discovered a buffer overflow vulnerability in the
USB gadget subsystem, resulting in information disclosure, denial of
service or privilege escalation.

CVE-2021-45095

It was discovered that the Phone Network p...