USN-4576-1: Linux kernel vulnerabilities
14 October 2020
Several security issues were fixed in the Linux kernel.
Releases
Packages
- linux - Linux kernel
- linux-aws - Linux kernel for Amazon Web Services (AWS) systems
- linux-aws-5.4 - Linux kernel for Amazon Web Services (AWS) systems
- linux-azure - Linux kernel for Microsoft Azure Cloud systems
- linux-azure-5.4 - Linux kernel for Microsoft Azure cloud systems
- linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
- linux-gcp-5.4 - Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe-5.4 - Linux hardware enablement (HWE) kernel
- linux-kvm - Linux kernel for cloud environments
- linux-oracle - Linux kernel for Oracle Cloud systems
- linux-oracle-5.4 - Linux kernel for Oracle Cloud systems
- linux-raspi - Linux kernel for Raspberry Pi (V8) systems
- linux-raspi-5.4 - Linux kernel for Raspberry Pi (V8) systems
Details
Hadar Manor discovered that the DCCP protocol implementation in the Linux
kernel improperly handled socket reuse, 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-2020-16119)
Jay Shin discovered that the ext4 file system implementation in the Linux
kernel did not properly handle directory access with broken indexing,
leading to an out-of-bounds read vulnerability. A local attacker could use
this to cause a denial of service (system crash). (CVE-2020-14314)
David Alan Gilbert discovered that the XFS file system implementation in
the Linux kernel did not properly perform metadata validation in some
circumstances. A local attacker could use this to cause a denial of
service. (CVE-2020-14385)
Giuseppe Scrivano discovered that the overlay file system in the Linux
kernel did not properly perform permission checks in some situations. A
local attacker could possibly use this to bypass intended restrictions and
gain read access to restricted files. (CVE-2020-16120)
It was discovered that a race condition existed in the hugetlb sysctl
implementation in the Linux kernel. A privileged attacker could use this to
cause a denial of service (system crash). (CVE-2020-25285)
It was discovered that the block layer subsystem in the Linux kernel did
not properly handle zero-length requests. A local attacker could use this
to cause a denial of service. (CVE-2020-25641)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04
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linux-image-5.4.0-1021-raspi
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5.4.0-1021.24
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linux-image-5.4.0-1026-kvm
-
5.4.0-1026.27
-
linux-image-5.4.0-1028-aws
-
5.4.0-1028.29
-
linux-image-5.4.0-1028-gcp
-
5.4.0-1028.29
-
linux-image-5.4.0-1028-oracle
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5.4.0-1028.29
-
linux-image-5.4.0-1031-azure
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5.4.0-1031.32
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linux-image-5.4.0-51-generic
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5.4.0-51.56
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linux-image-5.4.0-51-generic-lpae
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5.4.0-51.56
-
linux-image-5.4.0-51-lowlatency
-
5.4.0-51.56
-
linux-image-aws
-
5.4.0.1028.29
-
linux-image-azure
-
5.4.0.1031.29
-
linux-image-gcp
-
5.4.0.1028.36
-
linux-image-generic
-
5.4.0.51.54
-
linux-image-generic-hwe-20.04
-
5.4.0.51.54
-
linux-image-generic-lpae
-
5.4.0.51.54
-
linux-image-generic-lpae-hwe-20.04
-
5.4.0.51.54
-
linux-image-gke
-
5.4.0.1028.36
-
linux-image-kvm
-
5.4.0.1026.24
-
linux-image-lowlatency
-
5.4.0.51.54
-
linux-image-lowlatency-hwe-20.04
-
5.4.0.51.54
-
linux-image-oem
-
5.4.0.51.54
-
linux-image-oem-osp1
-
5.4.0.51.54
-
linux-image-oracle
-
5.4.0.1028.25
-
linux-image-raspi
-
5.4.0.1021.56
-
linux-image-raspi2
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5.4.0.1021.56
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linux-image-virtual
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5.4.0.51.54
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linux-image-virtual-hwe-20.04
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5.4.0.51.54
Ubuntu 18.04
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linux-image-5.4.0-1021-raspi
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5.4.0-1021.24~18.04.1
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linux-image-5.4.0-1028-aws
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5.4.0-1028.29~18.04.1
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linux-image-5.4.0-1028-gcp
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5.4.0-1028.29~18.04.1
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linux-image-5.4.0-1028-oracle
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5.4.0-1028.29~18.04.1
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linux-image-5.4.0-1031-azure
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5.4.0-1031.32~18.04.1
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linux-image-5.4.0-51-generic
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5.4.0-51.56~18.04.1
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linux-image-5.4.0-51-generic-lpae
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5.4.0-51.56~18.04.1
-
linux-image-5.4.0-51-lowlatency
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5.4.0-51.56~18.04.1
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linux-image-aws
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5.4.0.1028.13
-
linux-image-azure
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5.4.0.1031.13
-
linux-image-gcp
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5.4.0.1028.16
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linux-image-generic-hwe-18.04
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5.4.0.51.56~18.04.45
-
linux-image-generic-lpae-hwe-18.04
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5.4.0.51.56~18.04.45
-
linux-image-lowlatency-hwe-18.04
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5.4.0.51.56~18.04.45
-
linux-image-oracle
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5.4.0.1028.12
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linux-image-raspi-hwe-18.04
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5.4.0.1021.25
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linux-image-snapdragon-hwe-18.04
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5.4.0.51.56~18.04.45
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linux-image-virtual-hwe-18.04
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5.4.0.51.56~18.04.45
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.
Related notices
- USN-4578-1: linux-oracle, linux-gcp, linux-image-lowlatency, linux-image-oracle, linux-aws, linux-azure, linux-image-4.15.0-120-generic, linux-image-generic-lpae, linux-image-gcp, linux-image-4.15.0-1077-kvm, linux-image-snapdragon, linux-image-4.15.0-120-lowlatency, linux-azure-4.15, linux-image-4.15.0-1099-azure, linux-image-azure, linux-image-lowlatency-hwe-16.04-edge, linux-image-virtual-hwe-16.04-edge, linux-image-generic, linux-image-gke, linux-image-4.15.0-1086-aws, linux-snapdragon, linux-image-gcp-lts-18.04, linux-image-4.15.0-1072-gke, linux-hwe, linux-oem, linux-image-generic-lpae-hwe-16.04-edge, linux-aws-hwe, linux-image-aws-lts-18.04, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-1099-oem, linux-image-4.15.0-1085-aws, linux-image-oracle-lts-18.04, linux-gke-4.15, linux-image-gke-4.15, linux-image-4.15.0-1056-oracle, linux-image-4.15.0-120-generic-lpae, linux-image-4.15.0-121-lowlatency, linux-image-virtual, linux-image-4.15.0-1089-snapdragon, linux-image-4.15.0-1098-azure, linux-image-azure-edge, linux-image-4.15.0-1057-oracle, linux-image-4.15.0-1086-gcp, linux-image-oem, linux-image-virtual-hwe-16.04, linux-raspi2, linux-kvm, linux-image-generic-hwe-16.04, linux-image-raspi2, linux, linux-image-azure-lts-18.04, linux-image-4.15.0-121-generic, linux-image-4.15.0-121-generic-lpae, linux-image-lowlatency-hwe-16.04, linux-image-generic-hwe-16.04-edge, linux-gcp-4.15, linux-image-aws-hwe, linux-image-4.15.0-1073-raspi2, linux-image-kvm
- USN-4579-1: linux-image-4.4.0-193-powerpc-e500mc, linux-image-lowlatency, linux-image-powerpc64-emb-lts-xenial, linux-image-virtual-lts-utopic, linux-image-virtual-lts-vivid, linux-image-powerpc-smp-lts-vivid, linux-image-generic-lts-utopic, linux-aws, linux-image-generic-lpae, linux-image-powerpc64-smp, linux-image-snapdragon, linux-image-powerpc64-emb, linux-image-4.4.0-193-powerpc64-smp, linux-image-powerpc-e500mc-lts-vivid, linux-image-generic-lpae-lts-utopic, linux-image-lowlatency-lts-wily, linux-image-powerpc64-emb-lts-wily, linux-image-generic, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc-smp, linux-image-powerpc64-emb-lts-utopic, linux-snapdragon, linux-image-aws, linux-image-generic-lts-wily, linux-image-powerpc64-emb-lts-vivid, linux-lts-xenial, linux-image-4.4.0-193-generic, linux-image-lowlatency-lts-vivid, linux-image-powerpc-e500mc, linux-image-powerpc64-smp-lts-utopic, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc-smp-lts-xenial, linux-image-generic-lpae-lts-vivid, linux-image-4.4.0-193-powerpc-smp, linux-image-powerpc-e500mc-lts-xenial, linux-image-virtual-lts-xenial, linux-image-4.4.0-193-lowlatency, linux-image-virtual, linux-image-powerpc64-smp-lts-wily, linux-image-4.4.0-1081-aws, linux-image-generic-lpae-lts-wily, linux-image-4.4.0-1145-snapdragon, linux-image-powerpc-smp-lts-utopic, linux-image-virtual-lts-wily, linux-raspi2, linux-kvm, linux-image-raspi2, linux, linux-image-generic-lts-xenial, linux-image-powerpc-e500mc-lts-wily, linux-image-4.4.0-1117-aws, linux-image-powerpc64-smp-lts-vivid, linux-image-powerpc-smp-lts-wily, linux-image-generic-lpae-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-generic-lts-vivid, linux-image-lowlatency-lts-utopic, linux-image-4.4.0-1141-raspi2, linux-image-4.4.0-1082-kvm, linux-image-4.4.0-193-powerpc64-emb, linux-image-4.4.0-193-generic-lpae, linux-image-kvm
- USN-4752-1: linux-image-5.6.0-1048-oem, linux-oem-5.6, linux-image-oem-20.04
- USN-4660-1: linux-image-4.15.0-1091-snapdragon, linux-oracle, linux-gcp, linux-image-lowlatency, linux-image-4.15.0-1074-raspi2, linux-image-4.15.0-126-generic-lpae, linux-image-4.15.0-126-lowlatency, linux-image-oracle, linux-aws, linux-azure, linux-image-generic-lpae, linux-image-gcp, linux-image-4.15.0-1074-gke, linux-image-snapdragon, linux-azure-4.15, linux-image-azure, linux-image-4.15.0-1088-gcp, linux-image-lowlatency-hwe-16.04-edge, linux-image-virtual-hwe-16.04-edge, linux-image-4.15.0-126-generic, linux-image-generic, linux-image-gke, linux-snapdragon, linux-image-gcp-lts-18.04, linux-oem, linux-hwe, linux-image-4.15.0-1088-aws, linux-image-generic-lpae-hwe-16.04-edge, linux-aws-hwe, linux-image-aws-lts-18.04, linux-image-generic-lpae-hwe-16.04, linux-image-oracle-lts-18.04, linux-gke-4.15, linux-image-gke-4.15, linux-image-virtual, linux-image-azure-edge, linux-image-oem, linux-image-4.15.0-1079-kvm, linux-image-kvm, linux-image-virtual-hwe-16.04, linux-kvm, linux-image-generic-hwe-16.04, linux-raspi2, linux-image-raspi2, linux, linux-image-azure-lts-18.04, linux-image-lowlatency-hwe-16.04, linux-image-4.15.0-1100-azure, linux-image-generic-hwe-16.04-edge, linux-gcp-4.15, linux-image-aws-hwe, linux-image-4.15.0-1103-oem, linux-image-4.15.0-1059-oracle
- USN-4577-1: linux-image-5.0.0-1049-gke, linux-image-gke-5.3, linux-gke-5.3, linux-image-gkeop-5.3, linux-image-raspi2-hwe-18.04, linux-image-5.3.0-1038-gke, linux-image-5.0.0-1069-oem-osp1, linux-image-5.3.0-1035-raspi2, linux-oem-osp1, linux-image-5.3.0-68-generic, linux-raspi2-5.3, linux-image-5.3.0-68-lowlatency, linux-image-gke-5.0, linux-hwe, linux-image-oem-osp1, linux-gke-5.0
- LSN-0072-1: oem, generic-4.4, lowlatency-5.4, aws, gcp, azure, lowlatency-4.15, generic-4.15, generic-5.4, lowlatency-4.4
- USN-4912-1: linux-oem-5.6, linux-image-oem-20.04, linux-image-5.6.0-1053-oem
- USN-4580-1: linux-image-lowlatency, linux-image-generic-pae, linux-image-server, linux-image-generic-lts-saucy, linux-image-3.2.0-149-virtual, linux-image-generic-lts-trusty, linux-image-generic-lpae, linux-image-powerpc64-smp, linux-image-3.13.0-182-powerpc64-smp, linux-image-powerpc64-emb, linux-image-3.13.0-182-generic-lpae, linux-image-highbank, linux-image-3.13.0-182-powerpc-e500mc, linux-image-generic, linux-image-3.13.0-182-lowlatency, linux-image-generic-lpae-lts-saucy, linux-image-powerpc-e500, linux-image-powerpc-e500mc, linux-image-lowlatency-pae, linux-image-3.2.0-149-highbank, linux-lts-trusty, linux-image-virtual, linux-image-3.2.0-149-omap, linux-image-powerpc, linux-image-3.2.0-149-generic, linux-image-3.13.0-182-powerpc-e500, linux-image-3.2.0-149-powerpc-smp, linux-image-generic-lpae-lts-trusty, linux-image-3.13.0-182-generic, linux, linux-image-3.13.0-182-powerpc-smp, linux-image-generic-lts-quantal, linux-image-3.13.0-182-powerpc64-emb, linux-image-3.2.0-149-generic-pae, linux-image-generic-lts-raring, linux-image-3.2.0-149-powerpc64-smp, linux-image-omap, linux-image-powerpc-smp