USN-4883-1: Linux kernel vulnerabilities
29 March 2021
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-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-azure - Linux kernel for Microsoft Azure Cloud systems
- linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems
- linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
- linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe - Linux hardware enablement (HWE) kernel
- linux-kvm - Linux kernel for cloud environments
- linux-oracle - Linux kernel for Oracle Cloud systems
- linux-raspi2 - Linux kernel for Raspberry Pi (V8) systems
- linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors
Details
Adam Nichols discovered that heap overflows existed in the iSCSI subsystem
in the Linux kernel. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2021-27365)
Adam Nichols discovered that the iSCSI subsystem in the Linux kernel did
not properly restrict access to iSCSI transport handles. A local attacker
could use this to cause a denial of service or expose sensitive information
(kernel pointer addresses). (CVE-2021-27363)
Adam Nichols discovered that an out-of-bounds read existed in the iSCSI
subsystem in the Linux kernel. A local attacker could use this to cause a
denial of service (system crash) or expose sensitive information (kernel
memory). (CVE-2021-27364)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 18.04
-
linux-image-4.15.0-1081-raspi2
-
4.15.0-1081.86
-
linux-image-4.15.0-139-lowlatency
-
4.15.0-139.143
-
linux-image-gcp-lts-18.04
-
4.15.0.1095.113
-
linux-image-4.15.0-1087-kvm
-
4.15.0-1087.89
-
linux-image-oracle-lts-18.04
-
4.15.0.1067.77
-
linux-image-4.15.0-1095-gcp
-
4.15.0-1095.108
-
linux-image-virtual
-
4.15.0.139.126
-
linux-image-snapdragon
-
4.15.0.1098.101
-
linux-image-4.15.0-139-generic
-
4.15.0-139.143
-
linux-image-4.15.0-139-generic-lpae
-
4.15.0-139.143
-
linux-image-4.15.0-1096-aws
-
4.15.0-1096.103
-
linux-image-aws-lts-18.04
-
4.15.0.1096.99
-
linux-image-4.15.0-1110-azure
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4.15.0-1110.122
-
linux-image-generic
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4.15.0.139.126
-
linux-image-4.15.0-1098-snapdragon
-
4.15.0-1098.107
-
linux-image-kvm
-
4.15.0.1087.83
-
linux-image-raspi2
-
4.15.0.1081.78
-
linux-image-azure-lts-18.04
-
4.15.0.1110.83
-
linux-image-generic-lpae
-
4.15.0.139.126
-
linux-image-4.15.0-1067-oracle
-
4.15.0-1067.75
-
linux-image-lowlatency
-
4.15.0.139.126
Ubuntu 16.04
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linux-image-4.15.0-1067-oracle
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4.15.0-1067.75~16.04.1
-
linux-image-4.4.0-206-powerpc-smp
-
4.4.0-206.238
-
linux-image-4.4.0-1152-snapdragon
-
4.4.0-1152.162
-
linux-image-4.4.0-206-powerpc-e500mc
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4.4.0-206.238
-
linux-image-4.15.0-1096-aws
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4.15.0-1096.103~16.04.1
-
linux-image-powerpc-e500mc
-
4.4.0.206.212
-
linux-image-generic-hwe-16.04
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4.15.0.139.134
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linux-image-4.15.0-139-lowlatency
-
4.15.0-139.143~16.04.1
-
linux-image-virtual-hwe-16.04
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4.15.0.139.134
-
linux-image-oracle
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4.15.0.1067.55
-
linux-image-azure
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4.15.0.1110.101
-
linux-image-generic-lpae-hwe-16.04
-
4.15.0.139.134
-
linux-image-4.4.0-1090-kvm
-
4.4.0-1090.99
-
linux-image-4.15.0-1095-gcp
-
4.15.0-1095.108~16.04.1
-
linux-image-virtual
-
4.4.0.206.212
-
linux-image-aws-hwe
-
4.15.0.1096.89
-
linux-image-4.15.0-139-generic-lpae
-
4.15.0-139.143~16.04.1
-
linux-image-4.4.0-206-generic-lpae
-
4.4.0-206.238
-
linux-image-4.4.0-206-powerpc64-smp
-
4.4.0-206.238
-
linux-image-4.15.0-139-generic
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4.15.0-139.143~16.04.1
-
linux-image-aws
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4.4.0.1124.129
-
linux-image-4.4.0-206-lowlatency
-
4.4.0-206.238
-
linux-image-gke
-
4.15.0.1095.96
-
linux-image-azure-edge
-
4.15.0.1110.101
-
linux-image-4.15.0-1110-azure
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4.15.0-1110.122~16.04.1
-
linux-image-generic
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4.4.0.206.212
-
linux-image-4.4.0-1124-aws
-
4.4.0-1124.138
-
linux-image-4.4.0-1148-raspi2
-
4.4.0-1148.158
-
linux-image-oem
-
4.15.0.139.134
-
linux-image-kvm
-
4.4.0.1090.88
-
linux-image-raspi2
-
4.4.0.1148.148
-
linux-image-snapdragon
-
4.4.0.1152.144
-
linux-image-powerpc-smp
-
4.4.0.206.212
-
linux-image-generic-lpae
-
4.4.0.206.212
-
linux-image-4.4.0-206-powerpc64-emb
-
4.4.0-206.238
-
linux-image-gcp
-
4.15.0.1095.96
-
linux-image-lowlatency-hwe-16.04
-
4.15.0.139.134
-
linux-image-powerpc64-emb
-
4.4.0.206.212
-
linux-image-4.4.0-206-generic
-
4.4.0-206.238
-
linux-image-powerpc64-smp
-
4.4.0.206.212
-
linux-image-lowlatency
-
4.4.0.206.212
Ubuntu 14.04
-
linux-image-4.15.0-1110-azure
-
4.15.0-1110.122~14.04.1
-
linux-image-aws
-
4.4.0.1088.85
-
linux-image-4.4.0-1088-aws
-
4.4.0-1088.92
-
linux-image-azure
-
4.15.0.1110.83
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
Related notices
- USN-4887-1: linux-image-raspi2-hwe-18.04-edge, linux-image-generic, linux-hwe, linux-image-gkeop-5.3, linux-image-generic-lpae-hwe-18.04, linux-image-generic-64k, linux-image-5.4.0-1041-aws, linux-image-5.4.0-70-generic-lpae, linux-image-lowlatency, linux-image-5.8.0-1024-oracle, linux-image-oem-20.04, linux-image-5.4.0-1043-azure, linux-image-virtual-hwe-20.04-edge, linux-image-5.4.0-70-lowlatency, linux-image-azure-edge, linux-image-lowlatency-hwe-18.04, linux-image-5.8.0-48-generic-lpae, linux-image-virtual-hwe-18.04-edge, linux-image-5.8.0-1019-raspi, linux-image-5.3.0-1041-gke, linux-image-oem-osp1, linux-image-kvm, linux-image-generic-lpae-hwe-20.04-edge, linux-image-5.8.0-1019-raspi-nolpae, linux-gkeop-5.4, linux-image-lowlatency-hwe-18.04-edge, linux-image-snapdragon-hwe-18.04-edge, linux-image-5.4.0-1041-oracle, linux-image-generic-hwe-20.04-edge, linux-image-azure, linux-image-5.4.0-1036-kvm, linux-image-aws, linux-image-oracle-edge, linux-oracle, linux-image-5.4.0-1040-gcp, linux-image-5.8.0-48-generic, linux-image-5.4.0-1012-gkeop, linux-image-oem-20.04b, linux-image-raspi-nolpae, linux-image-5.8.0-1026-gcp, linux-hwe-5.8, linux-raspi2-5.3, linux-azure-5.4, linux-image-gcp-edge, linux-image-snapdragon-hwe-18.04, linux-aws, linux-image-5.8.0-1027-aws, linux-image-gkeop-5.4, linux-image-oracle, linux-image-raspi-hwe-18.04-edge, linux-gcp, linux-oem-5.10, linux-image-5.3.0-72-lowlatency, linux-image-generic-hwe-20.04, linux-image-5.6.0-1052-oem, linux-image-5.8.0-1026-azure, linux-image-5.8.0-1022-kvm, linux-raspi-5.4, linux-image-gcp, linux-image-generic-lpae-hwe-20.04, linux-image-5.10.0-1019-oem, linux-azure, linux-aws-5.4, linux-image-gke-5.3, linux-gke-5.3, linux-kvm, linux-image-5.4.0-70-generic, linux-image-5.8.0-48-generic-64k, linux-image-generic-lpae, linux-image-raspi2, linux, linux-image-generic-hwe-18.04, linux-image-virtual-hwe-18.04, linux-image-generic-64k-hwe-20.04-edge, linux-image-lowlatency-hwe-20.04, linux-image-lowlatency-hwe-20.04-edge, linux-image-generic-64k-hwe-20.04, linux-image-raspi2-hwe-18.04, linux-image-5.4.0-1039-gke, linux-image-generic-lpae-hwe-18.04-edge, linux-image-5.4.0-1032-raspi, linux-image-gkeop, linux-oracle-5.4, linux-oem-5.6, linux-image-gke-5.4, linux-image-oem, linux-image-5.8.0-48-lowlatency, linux-image-raspi, linux-hwe-5.4, linux-image-aws-edge, linux-image-virtual-hwe-20.04, linux-gcp-5.4, linux-raspi, linux-image-gke, linux-image-generic-hwe-18.04-edge, linux-gkeop, linux-image-virtual, linux-image-5.3.0-72-generic, linux-gke-5.4, linux-image-raspi-hwe-18.04, linux-image-oem-20.04-edge, linux-image-5.3.0-1038-raspi2
- USN-4889-1: linux-image-4.4.0-206-powerpc64-smp, linux-image-highbank, linux-lts-xenial, linux-image-generic, linux-image-virtual-lts-xenial, linux-image-generic-lts-raring, linux-image-3.13.0-185-powerpc64-emb, linux-image-4.4.0-206-powerpc64-emb, linux-image-4.4.0-206-generic, linux-image-4.4.0-206-lowlatency, linux-image-generic-lts-saucy, linux-image-3.13.0-185-powerpc64-smp, linux-image-lowlatency, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-206-generic-lpae, linux-image-3.13.0-185-powerpc-e500, linux-image-server, linux-image-3.13.0-185-powerpc-smp, linux-image-3.13.0-185-generic, linux-image-4.4.0-206-powerpc-e500mc, linux-image-lowlatency-pae, linux-image-powerpc64-emb, linux-image-generic-lts-trusty, linux-image-3.13.0-185-generic-lpae, linux-image-generic-lpae-lts-trusty, linux-image-generic-lpae, linux-image-generic-lts-quantal, linux-image-powerpc-smp, linux-image-omap, linux-image-powerpc-smp-lts-xenial, linux, linux-image-powerpc-e500, linux-image-virtual, linux-image-generic-lpae-lts-saucy, linux-image-generic-lpae-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-generic-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-image-3.13.0-185-powerpc-e500mc, linux-image-powerpc64-smp, linux-image-3.13.0-185-lowlatency, linux-image-generic-pae, linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-206-powerpc-smp, linux-image-powerpc-e500mc
- USN-4901-1: linux-lts-trusty, linux-image-generic-lts-trusty, linux-image-3.13.0-185-generic