A kernel security update has been released for Fedora 33.

SECURITY: Fedora 33 Update: kernel-5.11.9-200.fc33

--------------------------------------------------------------------------------
Fedora Update Notification
FEDORA-2021-68b0dd2373
2021-03-26 17:52:06.072630
--------------------------------------------------------------------------------

Name : kernel
Product : Fedora 33
Version : 5.11.9
Release : 200.fc33
URL :   https://www.kernel.org/
Summary : The Linux kernel
Description :
The kernel meta package

--------------------------------------------------------------------------------
Update Information:

The 5.11.9 stable update contains a number of important fixes across the tree.
--------------------------------------------------------------------------------
ChangeLog:

* Wed Mar 24 2021 Justin M. Forbes [5.11.9-11]
- KVM: PPC: Book3S HV: Save and restore FSCR in the P9 path (Fabiano Rosas)
- drm/nouveau/kms/nve4-nv108: Don't advertise 256x256 cursor support yet (Lyude Paul)
- platform/x86: intel-vbtn: Stop reporting SW_DOCK events (Hans de Goede)
- platform/x86: dell-wmi-sysman: Cleanup create_attributes_level_sysfs_files() (Hans de Goede)
- platform/x86: dell-wmi-sysman: Make sysman_init() return -ENODEV of the interfaces are not found (Hans de Goede)
- platform/x86: dell-wmi-sysman: Cleanup sysman_init() error-exit handling (Hans de Goede)
- platform/x86: dell-wmi-sysman: Fix release_attributes_data() getting called twice on init_bios_attributes() failure (Hans de Goede)
- platform/x86: dell-wmi-sysman: Make it safe to call exit_foo_attributes() multiple times (Hans de Goede)
- platform/x86: dell-wmi-sysman: Fix possible NULL pointer deref on exit (Hans de Goede)
- platform/x86: dell-wmi-sysman: Fix crash caused by calling kset_unregister twice (Hans de Goede)
- platform/x86: thinkpad_acpi: Disable DYTC CQL mode around switching to balanced mode (Hans de Goede)
- platform/x86: thinkpad_acpi: Allow the FnLock LED to change state (Esteve Varela Colominas)
- platform/x86: thinkpad_acpi: check dytc version for lapmode sysfs (Mark Pearson)
- platform/x86: intel-hid: Support Lenovo ThinkPad X1 Tablet Gen 2 (Alban Bedel)
--------------------------------------------------------------------------------
References:

[ 1 ] Bug #1941769 - CVE-2021-28951 kernel: DoS because of deadlock in fs/io_uring.c
  https://bugzilla.redhat.com/show_bug.cgi?id=1941769
[ 2 ] Bug #1941774 - CVE-2021-28952 kernel: buffer overflow in sound/soc/qcom/sdm845.c when an unexpected port ID number is encountered
  https://bugzilla.redhat.com/show_bug.cgi?id=1941774
[ 3 ] Bug #1941781 - CVE-2021-28972 kernel: Buffer overflow in hotplug/rpadlpar_sysfs.c
  https://bugzilla.redhat.com/show_bug.cgi?id=1941781
[ 4 ] Bug #1941784 - CVE-2021-28971 kernel: System crash in intel_pmu_drain_pebs_nhm in arch/x86/events/intel/ds.c
  https://bugzilla.redhat.com/show_bug.cgi?id=1941784
[ 5 ] Bug #1941804 - CVE-2021-28964 kernel: race condition in get_old_root function in fs/btrfs/ctree.c because of a lack of locking on an extent buffer before a cloning operation
  https://bugzilla.redhat.com/show_bug.cgi?id=1941804
--------------------------------------------------------------------------------

This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-68b0dd2373' at the command
line. For more information, refer to the dnf documentation available at
  http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

All packages are signed with the Fedora Project GPG key. More details on the
GPG keys used by the Fedora Project can be found at
  https://fedoraproject.org/keys