Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2021.1050
USN-4889-1 and USN-4890-1: Linux kernel vulnerabilities
25 March 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-27365 CVE-2021-27364 CVE-2021-27363
CVE-2020-27171 CVE-2020-27170
Reference: ESB-2021.1002
ESB-2021.0981
ESB-2021.0837
Original Bulletin:
https://ubuntu.com/security/notices/USN-4889-1
https://ubuntu.com/security/notices/USN-4890-1
Comment: This bulletin contains two (2) Ubuntu security advisories.
- --------------------------BEGIN INCLUDED TEXT--------------------
USN-4889-1: Linux kernel vulnerabilities
25 March 2021
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 14.04 ESM
Packages
o linux - Linux kernel
o linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty
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 14.04
o linux-image-server - 3.13.0.185.194
o linux-image-lowlatency-lts-xenial - 4.4.0.206.179
o linux-image-generic-lpae - 3.13.0.185.194
o linux-image-lowlatency-pae - 3.13.0.185.194
o linux-image-generic - 3.13.0.185.194
o linux-image-3.13.0-185-generic - 3.13.0-185.236
o linux-image-generic-pae - 3.13.0.185.194
o linux-image-generic-lpae-lts-xenial - 4.4.0.206.179
o linux-image-4.4.0-206-generic - 4.4.0-206.238~14.04.1
o linux-image-virtual-lts-xenial - 4.4.0.206.179
o linux-image-4.4.0-206-generic-lpae - 4.4.0-206.238~14.04.1
o linux-image-generic-lts-xenial - 4.4.0.206.179
o linux-image-3.13.0-185-generic-lpae - 3.13.0-185.236
o linux-image-3.13.0-185-lowlatency - 3.13.0-185.236
o linux-image-lowlatency - 3.13.0.185.194
o linux-image-virtual - 3.13.0.185.194
o linux-image-4.4.0-206-lowlatency - 4.4.0-206.238~14.04.1
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-2021-27363
o CVE-2021-27364
o CVE-2021-27365
Related notices
o USN-4883-1 : linux-image-oem, linux-image-azure-lts-18.04,
linux-image-generic-lpae, linux-image-kvm, linux-snapdragon, linux-hwe,
linux-image-oracle-lts-18.04, linux-aws, linux-image-4.4.0-1124-aws,
linux-image-azure-edge, linux-image-powerpc-e500mc,
linux-image-4.4.0-206-generic, linux-image-4.15.0-1110-azure,
linux-azure-4.15, linux-image-aws-hwe, linux-image-powerpc64-smp,
linux-image-oracle, linux-image-4.15.0-139-generic-lpae,
linux-image-4.15.0-1067-oracle, linux-image-4.15.0-1095-gcp,
linux-image-generic-hwe-16.04, linux-oracle, linux-image-4.4.0-1090-kvm,
linux-aws-hwe, linux-image-4.15.0-139-lowlatency,
linux-image-4.4.0-206-generic-lpae, linux-image-4.4.0-206-powerpc64-smp,
linux, linux-gcp-4.15, linux-image-4.4.0-206-powerpc-e500mc,
linux-image-aws-lts-18.04, linux-image-lowlatency, linux-image-gcp,
linux-image-gcp-lts-18.04, linux-image-aws, linux-gcp,
linux-image-4.15.0-1081-raspi2, linux-image-snapdragon,
linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-139-generic,
linux-image-4.4.0-206-lowlatency, linux-image-generic, linux-image-azure,
linux-image-powerpc-smp, linux-kvm, linux-image-4.15.0-1098-snapdragon,
linux-image-lowlatency-hwe-16.04, linux-image-gke,
linux-image-4.4.0-1088-aws, linux-image-raspi2, linux-raspi2,
linux-image-powerpc64-emb, linux-image-virtual-hwe-16.04,
linux-image-4.4.0-1152-snapdragon, linux-azure,
linux-image-4.15.0-1096-aws, linux-image-4.4.0-206-powerpc-smp,
linux-image-4.15.0-1087-kvm, linux-image-virtual,
linux-image-4.4.0-206-powerpc64-emb
o USN-4887-1 : linux-image-generic-lpae, linux-image-5.4.0-70-lowlatency,
linux-image-raspi2-hwe-18.04, linux-image-5.8.0-1019-raspi-nolpae,
linux-image-generic-64k, linux-image-5.10.0-1019-oem, linux-image-oracle,
linux-image-5.8.0-1019-raspi, linux-image-5.6.0-1052-oem,
linux-image-5.8.0-48-generic, linux-image-gcp, linux-image-5.8.0-1027-aws,
linux-oracle-5.4, linux-gcp, linux-image-generic,
linux-image-5.8.0-1026-azure, linux-image-5.8.0-48-generic-lpae,
linux-image-5.3.0-1038-raspi2, linux-azure, linux-image-5.3.0-72-generic,
linux-image-generic-lpae-hwe-18.04, linux-image-5.4.0-1040-gcp,
linux-raspi2-5.3, linux-image-raspi, linux-image-kvm,
linux-image-lowlatency-hwe-20.04, linux-image-virtual-hwe-18.04, linux-aws,
linux-image-5.4.0-70-generic-lpae, linux-gkeop,
linux-image-5.4.0-1032-raspi, linux-oem-5.10,
linux-image-generic-hwe-18.04, linux-image-5.4.0-1041-aws, linux-oracle,
linux, linux-image-5.4.0-1041-oracle, linux-image-lowlatency-hwe-18.04,
linux-image-gkeop-5.3, linux-image-gkeop-5.4, linux-image-gke,
linux-hwe-5.4, linux-image-5.8.0-1024-oracle, linux-image-oem-20.04,
linux-raspi-5.4, linux-image-gke-5.3, linux-azure-5.4, linux-gke-5.3,
linux-image-5.8.0-48-generic-64k, linux-image-5.8.0-1026-gcp,
linux-hwe-5.8, linux-image-5.8.0-48-lowlatency, linux-image-gkeop,
linux-image-aws, linux-image-gke-5.4, linux-image-oem-20.04b,
linux-image-azure, linux-kvm, linux-image-raspi2,
linux-image-generic-64k-hwe-20.04, linux-raspi, linux-image-5.4.0-1036-kvm,
linux-oem-5.6, linux-image-5.4.0-70-generic, linux-image-oem-osp1,
linux-image-raspi-hwe-18.04, linux-image-snapdragon-hwe-18.04,
linux-image-virtual, linux-image-5.3.0-72-lowlatency, linux-gkeop-5.4,
linux-image-oem, linux-hwe, linux-image-generic-lpae-hwe-20.04,
linux-gcp-5.4, linux-image-raspi-nolpae, linux-image-virtual-hwe-20.04,
linux-image-5.4.0-1012-gkeop, linux-image-5.4.0-1039-gke,
linux-image-lowlatency, linux-image-5.4.0-1043-azure, linux-aws-5.4,
linux-gke-5.4, linux-image-generic-hwe-20.04, linux-image-5.3.0-1041-gke,
linux-image-5.8.0-1022-kvm
- --------------------------------------------------------------------------------
USN-4890-1: Linux kernel vulnerabilities
25 March 2021
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
o linux-azure - Linux kernel for Microsoft Azure Cloud systems
o linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems
o linux-dell300x - Linux kernel for Dell 300x platforms
o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
o linux-hwe - Linux hardware enablement (HWE) kernel
o linux-kvm - Linux kernel for cloud environments
o linux-oracle - Linux kernel for Oracle Cloud systems
o linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors
Details
Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not
properly compute a speculative execution limit on pointer arithmetic in
some situations. A local attacker could use this to expose sensitive
information (kernel memory). ( CVE-2020-27171 )
Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not
properly apply speculative execution limits on some pointer types. A local
attacker could use this to expose sensitive information (kernel memory).
( CVE-2020-27170 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 18.04
o linux-image-4.15.0-1015-dell300x - 4.15.0-1015.19
o linux-image-powerpc-e500mc - 4.15.0.140.127
o linux-image-4.15.0-140-generic - 4.15.0-140.144
o linux-image-4.15.0-1068-oracle - 4.15.0-1068.76
o linux-image-gcp-lts-18.04 - 4.15.0.1096.114
o linux-image-4.15.0-140-generic-lpae - 4.15.0-140.144
o linux-image-4.15.0-1099-snapdragon - 4.15.0-1099.108
o linux-image-oracle-lts-18.04 - 4.15.0.1068.78
o linux-image-virtual - 4.15.0.140.127
o linux-image-snapdragon - 4.15.0.1099.102
o linux-image-powerpc64-emb - 4.15.0.140.127
o linux-image-powerpc64-smp - 4.15.0.140.127
o linux-image-dell300x - 4.15.0.1015.17
o linux-image-aws-lts-18.04 - 4.15.0.1097.100
o linux-image-generic - 4.15.0.140.127
o linux-image-4.15.0-140-lowlatency - 4.15.0-140.144
o linux-image-4.15.0-1096-gcp - 4.15.0-1096.109
o linux-image-kvm - 4.15.0.1088.84
o linux-image-4.15.0-1097-aws - 4.15.0-1097.104
o linux-image-azure-lts-18.04 - 4.15.0.1111.84
o linux-image-powerpc-smp - 4.15.0.140.127
o linux-image-generic-lpae - 4.15.0.140.127
o linux-image-4.15.0-1088-kvm - 4.15.0-1088.90
o linux-image-4.15.0-1111-azure - 4.15.0-1111.123
o linux-image-lowlatency - 4.15.0.140.127
Ubuntu 16.04
o linux-image-gke - 4.15.0.1096.97
o linux-image-lowlatency-hwe-16.04 - 4.15.0.140.135
o linux-image-oracle - 4.15.0.1068.56
o linux-image-virtual-hwe-16.04 - 4.15.0.140.135
o linux-image-4.15.0-140-generic - 4.15.0-140.144~16.04.1
o linux-image-generic-lpae-hwe-16.04 - 4.15.0.140.135
o linux-image-gcp - 4.15.0.1096.97
o linux-image-4.15.0-140-lowlatency - 4.15.0-140.144~16.04.1
o linux-image-azure - 4.15.0.1111.102
o linux-image-generic-hwe-16.04 - 4.15.0.140.135
o linux-image-4.15.0-1068-oracle - 4.15.0-1068.76~16.04.1
o linux-image-4.15.0-1111-azure - 4.15.0-1111.123~16.04.1
o linux-image-4.15.0-1096-gcp - 4.15.0-1096.109~16.04.1
o linux-image-aws-hwe - 4.15.0.1097.90
o linux-image-oem - 4.15.0.140.135
o linux-image-4.15.0-140-generic-lpae - 4.15.0-140.144~16.04.1
o linux-image-4.15.0-1097-aws - 4.15.0-1097.104~16.04.1
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-2020-27171
o CVE-2020-27170
Related notices
o USN-4887-1 : linux-image-5.8.0-1026-gcp, linux-image-5.4.0-1012-gkeop,
linux-gcp-5.4, linux-kvm, linux-image-5.4.0-1040-gcp,
linux-image-lowlatency-hwe-20.04, linux-raspi,
linux-image-5.8.0-1019-raspi, linux-image-5.6.0-1052-oem,
linux-image-5.8.0-48-generic-lpae, linux-image-generic-64k-hwe-20.04,
linux-image-virtual-hwe-18.04, linux-hwe-5.8, linux-hwe,
linux-image-5.8.0-48-lowlatency, linux-hwe-5.4, linux-image-5.4.0-1036-kvm,
linux-image-generic, linux-gkeop, linux-image-gke, linux-image-lowlatency,
linux-image-raspi-hwe-18.04, linux-image-5.4.0-70-generic,
linux-image-snapdragon-hwe-18.04, linux-oem-5.6,
linux-image-5.4.0-70-lowlatency, linux-oem-5.10, linux-azure,
linux-image-5.4.0-1043-azure, linux-image-gkeop-5.4, linux,
linux-image-oem-osp1, linux-image-5.8.0-1019-raspi-nolpae,
linux-image-oem-20.04b, linux-image-generic-hwe-18.04, linux-image-gke-5.4,
linux-oracle-5.4, linux-image-raspi2, linux-aws-5.4,
linux-image-generic-lpae-hwe-18.04, linux-image-5.4.0-1039-gke,
linux-image-aws, linux-image-virtual, linux-image-raspi-nolpae,
linux-image-5.3.0-1041-gke, linux-gke-5.4, linux-image-gkeop,
linux-image-5.4.0-1041-oracle, linux-image-5.8.0-1022-kvm,
linux-image-5.3.0-72-lowlatency, linux-image-oem-20.04,
linux-image-5.4.0-70-generic-lpae, linux-oracle,
linux-image-generic-hwe-20.04, linux-image-gkeop-5.3,
linux-image-virtual-hwe-20.04, linux-gcp, linux-image-5.8.0-48-generic,
linux-image-5.8.0-48-generic-64k, linux-image-gke-5.3, linux-image-azure,
linux-image-kvm, linux-image-5.4.0-1041-aws, linux-image-5.3.0-72-generic,
linux-image-raspi2-hwe-18.04, linux-azure-5.4, linux-image-5.10.0-1019-oem,
linux-image-5.4.0-1032-raspi, linux-image-lowlatency-hwe-18.04,
linux-image-generic-lpae-hwe-20.04, linux-image-5.8.0-1026-azure,
linux-image-gcp, linux-image-raspi, linux-image-5.3.0-1038-raspi2,
linux-raspi2-5.3, linux-image-generic-lpae, linux-gkeop-5.4,
linux-raspi-5.4, linux-image-oracle, linux-image-5.8.0-1027-aws,
linux-gke-5.3, linux-image-generic-64k, linux-aws,
linux-image-5.8.0-1024-oracle, linux-image-oem
- --------------------------END INCLUDED TEXT--------------------
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