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ZMCIRT Vulnerability Bulletin
ZMC-2021.06.3.1500
linux kernel: Multiple vulnerabilities
4th June 2021
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Product: linux kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-31916 CVE-2021-29647 CVE-2021-29264
CVE-2021-28972 CVE-2021-28971 CVE-2021-28964
CVE-2021-28950 CVE-2021-28688 CVE-2021-3483
CVE-2020-25673 CVE-2020-25672 CVE-2020-25671
CVE-2020-25670
Reference: ESB-2021.1919
ESB-2021.1669
ESB-2021.1624
Original Bulletin:
https://ubuntu.com/security/notices/USN-4982-1
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USN-4982-1: Linux kernel vulnerabilities
03 June 2021
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
Packages
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-aws-5.4 - Linux kernel for Amazon Web Services (AWS) systems
o linux-azure - Linux kernel for Microsoft Azure Cloud systems
o linux-azure-5.4 - Linux kernel for Microsoft Azure cloud systems
o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-gcp-5.4 - Linux kernel for Google Cloud Platform (GCP) systems
o linux-gke - Linux kernel for Google Container Engine (GKE) systems
o linux-gke-5.4 - Linux kernel for Google Container Engine (GKE) systems
o linux-gkeop - Linux kernel for Google Container Engine (GKE) systems
o linux-gkeop-5.4 - Linux kernel for Google Container Engine (GKE) systems
o linux-hwe-5.4 - Linux hardware enablement (HWE) kernel
o linux-kvm - Linux kernel for cloud environments
o linux-oracle - Linux kernel for Oracle Cloud systems
o linux-oracle-5.4 - Linux kernel for Oracle Cloud systems
Details
Kiyin () discovered that the NFC LLCP protocol implementation in the
Linux kernel contained a reference counting error. A local attacker could
use this to cause a denial of service (system crash). ( CVE-2020-25670 )
Kiyin () discovered that the NFC LLCP protocol implementation in the
Linux kernel did not properly deallocate memory in certain error
situations. A local attacker could use this to cause a denial of service
(memory exhaustion). ( CVE-2020-25671 , CVE-2020-25672 )
Kiyin () discovered that the NFC LLCP protocol implementation in the
Linux kernel did not properly handle error conditions in some situations,
leading to an infinite loop. A local attacker could use this to cause a
denial of service. ( CVE-2020-25673 )
It was discovered that the Xen paravirtualization backend in the Linux
kernel did not properly deallocate memory in some situations. A local
attacker could use this to cause a denial of service (memory exhaustion).
( CVE-2021-28688 )
It was discovered that the fuse user space file system implementation in
the Linux kernel did not properly handle bad inodes in some situations. A
local attacker could possibly use this to cause a denial of service.
( CVE-2021-28950 )
Zygo Blaxell discovered that the btrfs file system implementation in the
Linux kernel contained a race condition during certain cloning operations.
A local attacker could possibly use this to cause a denial of service
(system crash). ( CVE-2021-28964 )
Vince Weaver discovered that the perf subsystem in the Linux kernel did not
properly handle certain PEBS records properly for some Intel Haswell
processors. A local attacker could use this to cause a denial of service
(system crash). ( CVE-2021-28971 )
It was discovered that the RPA PCI Hotplug driver implementation in the
Linux kernel did not properly handle device name writes via sysfs, leading
to a buffer overflow. A privileged attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
( CVE-2021-28972 )
It was discovered that the Freescale Gianfar Ethernet driver for the Linux
kernel did not properly handle receive queue overrun when jumbo frames were
enabled in some situations. An attacker could use this to cause a denial of
service (system crash). ( CVE-2021-29264 )
It was discovered that the Qualcomm IPC router implementation in the Linux
kernel did not properly initialize memory passed to user space. A local
attacker could use this to expose sensitive information (kernel memory).
( CVE-2021-29647 )
Dan Carpenter discovered that the block device manager (dm) implementation
in the Linux kernel contained a buffer overflow in the ioctl for listing
devices. A privileged local attacker could use this to cause a denial of
service (system crash). ( CVE-2021-31916 )
discovered that the IEEE 1394 (Firewire) nosy packet sniffer driver in
the Linux kernel did not properly perform reference counting in some
situations, leading to a use-after-free vulnerability. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. ( CVE-2021-3483 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.04
o linux-image-virtual - 5.4.0.74.77
o linux-image-gkeop-5.4 - 5.4.0.1016.19
o linux-image-5.4.0-1044-gcp - 5.4.0-1044.47
o linux-image-5.4.0-74-lowlatency - 5.4.0-74.83
o linux-image-oem-osp1 - 5.4.0.74.77
o linux-image-oracle - 5.4.0.1046.45
o linux-image-azure - 5.4.0.1048.46
o linux-image-5.4.0-1046-oracle - 5.4.0-1046.50
o linux-image-5.4.0-1044-gke - 5.4.0-1044.46
o linux-image-gkeop - 5.4.0.1016.19
o linux-image-5.4.0-1049-aws - 5.4.0-1049.51
o linux-image-5.4.0-74-generic-lpae - 5.4.0-74.83
o linux-image-gke - 5.4.0.1044.53
o linux-image-5.4.0-1040-kvm - 5.4.0-1040.41
o linux-image-5.4.0-1048-azure - 5.4.0-1048.50
o linux-image-generic - 5.4.0.74.77
o linux-image-virtual-hwe-18.04 - 5.4.0.74.77
o linux-image-gke-5.4 - 5.4.0.1044.53
o linux-image-oem - 5.4.0.74.77
o linux-image-aws - 5.4.0.1049.50
o linux-image-kvm - 5.4.0.1040.38
o linux-image-generic-lpae - 5.4.0.74.77
o linux-image-gcp - 5.4.0.1044.53
o linux-image-5.4.0-74-generic - 5.4.0-74.83
o linux-image-lowlatency - 5.4.0.74.77
o linux-image-5.4.0-1016-gkeop - 5.4.0-1016.17
Ubuntu 18.04
o linux-image-gkeop-5.4 - 5.4.0.1016.17~18.04.17
o linux-image-5.4.0-1044-gcp - 5.4.0-1044.47~18.04.2
o linux-image-oem-osp1 - 5.4.0.74.83~18.04.67
o linux-image-oracle - 5.4.0.1046.50~18.04.28
o linux-image-generic-hwe-18.04 - 5.4.0.74.83~18.04.67
o linux-image-azure - 5.4.0.1048.27
o linux-image-5.4.0-1046-oracle - 5.4.0-1046.50~18.04.2
o linux-image-snapdragon-hwe-18.04 - 5.4.0.74.83~18.04.67
o linux-image-5.4.0-1044-gke - 5.4.0-1044.46~18.04.1
o linux-image-generic-lpae-hwe-18.04 - 5.4.0.74.83~18.04.67
o linux-image-5.4.0-74-lowlatency - 5.4.0-74.83~18.04.1
o linux-image-5.4.0-1049-aws - 5.4.0-1049.51~18.04.1
o linux-image-5.4.0-74-generic-lpae - 5.4.0-74.83~18.04.1
o linux-image-5.4.0-1048-azure - 5.4.0-1048.50~18.04.1
o linux-image-lowlatency-hwe-18.04 - 5.4.0.74.83~18.04.67
o linux-image-virtual-hwe-18.04 - 5.4.0.74.83~18.04.67
o linux-image-gke-5.4 - 5.4.0.1044.46~18.04.10
o linux-image-oem - 5.4.0.74.83~18.04.67
o linux-image-aws - 5.4.0.1049.31
o linux-image-gcp - 5.4.0.1044.31
o linux-image-5.4.0-74-generic - 5.4.0-74.83~18.04.1
o linux-image-5.4.0-1016-gkeop - 5.4.0-1016.17~18.04.1
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References
o CVE-2021-28950
o CVE-2021-28972
o CVE-2021-31916
o CVE-2021-28964
o CVE-2021-29647
o CVE-2020-25670
o CVE-2021-3483
o CVE-2020-25673
o CVE-2021-28688
o CVE-2020-25671
o CVE-2020-25672
o CVE-2021-28971
o CVE-2021-29264
Related notices
o USN-4911-1 : linux-image-oem-20.04b, linux-oem-5.10,
linux-image-5.10.0-1021-oem, linux-image-oem-20.04-edge
o USN-4946-1 : linux-aws, linux-image-4.15.0-1102-aws, linux-image-azure,
linux-image-4.15.0-143-generic-lpae, linux-image-4.15.0-1018-dell300x,
linux-image-oracle-lts-18.04, linux-snapdragon, linux-image-gke, linux,
linux-kvm, linux-oracle, linux-image-generic-hwe-16.04-edge,
linux-image-generic-lpae, linux-azure-4.15, linux-raspi2, linux-gcp,
linux-gcp-4.15, linux-image-4.15.0-1091-kvm,
linux-image-4.15.0-1085-raspi2, linux-image-aws-hwe, linux-image-dell300x,
linux-image-azure-lts-18.04, linux-azure, linux-image-4.15.0-143-generic,
linux-dell300x, linux-image-lowlatency-hwe-16.04, linux-image-raspi2,
linux-image-aws-lts-18.04, linux-image-oracle, linux-image-oem,
linux-image-virtual-hwe-16.04, linux-image-virtual, linux-image-gcp,
linux-image-virtual-hwe-16.04-edge, linux-image-generic-hwe-16.04,
linux-aws-hwe, linux-image-generic-lpae-hwe-16.04-edge,
linux-image-generic-lpae-hwe-16.04, linux-image-lowlatency,
linux-image-4.15.0-1071-oracle, linux-image-4.15.0-1099-gcp,
linux-image-4.15.0-143-lowlatency, linux-image-generic,
linux-image-snapdragon, linux-image-kvm,
linux-image-lowlatency-hwe-16.04-edge, linux-hwe,
linux-image-4.15.0-1102-snapdragon, linux-image-gcp-lts-18.04,
linux-image-4.15.0-1114-azure
o USN-4948-1 : linux-image-5.10.0-1026-oem, linux-image-oem-20.04b,
linux-oem-5.10, linux-image-oem-20.04-edge
o USN-4949-1 : linux-image-5.8.0-1024-raspi, linux-aws, linux-image-azure,
linux-image-generic-64k, linux-image-5.8.0-1027-kvm,
linux-image-virtual-hwe-20.04-edge, linux-image-aws,
linux-image-5.8.0-1029-oracle, linux-raspi, linux-image-gke, linux,
linux-image-oem-20.04, linux-kvm, linux-oracle, linux-image-generic-lpae,
linux-gcp, linux-image-generic-64k-hwe-20.04-edge,
linux-image-virtual-hwe-20.04, linux-image-5.8.0-53-generic-lpae,
linux-azure, linux-image-5.8.0-1024-raspi-nolpae,
linux-image-lowlatency-hwe-20.04-edge, linux-image-oracle,
linux-image-lowlatency-hwe-20.04, linux-image-virtual, linux-image-gcp,
linux-image-generic-hwe-20.04, linux-image-generic-lpae-hwe-20.04-edge,
linux-image-5.8.0-53-generic, linux-image-raspi, linux-image-lowlatency,
linux-image-5.8.0-1032-azure, linux-image-generic, linux-image-kvm,
linux-image-raspi-nolpae, linux-image-5.8.0-53-lowlatency,
linux-image-5.8.0-1031-gcp, linux-hwe-5.8,
linux-image-5.8.0-53-generic-64k, linux-image-generic-64k-hwe-20.04,
linux-image-generic-lpae-hwe-20.04, linux-image-generic-hwe-20.04-edge,
linux-image-5.8.0-1033-aws
o USN-4977-1 : linux-image-5.11.0-1006-azure, linux-aws,
linux-image-5.11.0-18-generic-64k, linux-image-azure,
linux-image-generic-64k, linux-image-virtual-hwe-20.04-edge,
linux-image-5.11.0-1008-aws, linux-image-aws, linux-raspi, linux-image-gke,
linux-image-5.11.0-1008-gcp, linux, linux-image-5.11.0-18-generic,
linux-image-oem-20.04, linux-kvm, linux-oracle,
linux-image-5.11.0-1009-raspi-nolpae, linux-image-5.11.0-18-generic-lpae,
linux-image-generic-lpae, linux-gcp,
linux-image-generic-64k-hwe-20.04-edge, linux-image-virtual-hwe-20.04,
linux-azure, linux-image-5.11.0-1007-oracle,
linux-image-lowlatency-hwe-20.04-edge, linux-image-oracle,
linux-image-lowlatency-hwe-20.04, linux-image-virtual, linux-image-gcp,
linux-image-generic-hwe-20.04, linux-image-generic-lpae-hwe-20.04-edge,
linux-image-raspi, linux-image-lowlatency,
linux-image-5.11.0-18-lowlatency, linux-image-5.11.0-1009-raspi,
linux-image-generic, linux-image-kvm, linux-image-raspi-nolpae,
linux-image-5.11.0-1008-kvm, linux-image-generic-64k-hwe-20.04,
linux-image-generic-lpae-hwe-20.04, linux-image-generic-hwe-20.04-edge
o USN-4979-1 : linux-aws, linux-image-4.15.0-1103-aws,
linux-image-4.15.0-144-lowlatency, linux-image-azure,
linux-image-4.15.0-1103-snapdragon, linux-image-oracle-lts-18.04,
linux-snapdragon, linux-image-gke, linux, linux-kvm, linux-oracle,
linux-image-generic-hwe-16.04-edge, linux-image-generic-lpae,
linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-image-aws-hwe,
linux-image-azure-lts-18.04, linux-azure, linux-image-lowlatency-hwe-16.04,
linux-image-aws-lts-18.04, linux-image-oracle, linux-image-oem,
linux-image-virtual-hwe-16.04, linux-image-virtual, linux-image-gcp,
linux-image-virtual-hwe-16.04-edge, linux-image-generic-hwe-16.04,
linux-aws-hwe, linux-image-generic-lpae-hwe-16.04-edge,
linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-144-generic-lpae,
linux-image-4.15.0-1092-kvm, linux-image-lowlatency, linux-image-generic,
linux-image-snapdragon, linux-image-kvm, linux-image-4.15.0-1100-gcp,
linux-image-lowlatency-hwe-16.04-edge, linux-image-4.15.0-1072-oracle,
linux-hwe, linux-image-4.15.0-144-generic, linux-image-azure-edge,
linux-image-4.15.0-1115-azure, linux-image-gcp-lts-18.04
ZMCIRT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. ZMCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.
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