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AUSCERT External Security Bulletin Redistribution
ESB-2021.4040
USN-5165-1: Linux kernel (OEM) vulnerabilities
1 December 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Linux kernel (OEM)
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-43389 CVE-2021-43267 CVE-2021-43056
CVE-2021-42739 CVE-2021-42327 CVE-2021-3772
CVE-2021-3760
Reference: ESB-2021.3968
ESB-2021.3927
ESB-2021.3867
Original Bulletin:
https://ubuntu.com/security/notices/USN-5165-1
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USN-5165-1: Linux kernel (OEM) vulnerabilities
30 November 2021
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 20.04 LTS
Packages
o linux-oem-5.14 - Linux kernel for OEM systems
Details
It was discovered that the NFC subsystem in the Linux kernel contained a
use-after-free vulnerability in its NFC Controller Interface (NCI)
implementation. A local attacker could possibly use this to cause a denial
of service (system crash) or execute arbitrary code. ( CVE-2021-3760 )
It was discovered that the SCTP protocol implementation in the Linux kernel
did not properly verify VTAGs in some situations. A remote attacker could
possibly use this to cause a denial of service (connection disassociation).
( CVE-2021-3772 )
It was discovered that the AMD Radeon GPU driver in the Linux kernel did
not properly validate writes in the debugfs file system. A privileged
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. ( CVE-2021-42327 )
Luo Likang discovered that the FireDTV Firewire driver in the Linux kernel
did not properly perform bounds checking in some situations. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. ( CVE-2021-42739 )
It was discovered that the KVM implementation for POWER8 processors in the
Linux kernel did not properly keep track if a wakeup event could be
resolved by a guest. An attacker in a guest VM could possibly use this to
cause a denial of service (host OS crash). ( CVE-2021-43056 )
It was discovered that the TIPC Protocol implementation in the Linux kernel
did not properly validate MSG_CRYPTO messages in some situations. An
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. ( CVE-2021-43267 )
It was discovered that the ISDN CAPI implementation in the Linux kernel
contained a race condition in certain situations that could trigger an
array out-of-bounds bug. A privileged local attacker could possibly use
this to cause a denial of service or execute arbitrary code.
( CVE-2021-43389 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.04
o linux-image-oem-20.04d - 5.14.0.1008.8
o linux-image-5.14.0-1008-oem - 5.14.0-1008.8
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-2021-3772
o CVE-2021-42327
o CVE-2021-43267
o CVE-2021-42739
o CVE-2021-3760
o CVE-2021-43389
o CVE-2021-43056
Related notices
o USN-5139-1 : linux-image-5.10.0-1051-oem, linux-tools-oem-20.04b,
linux-oem-20.04-edge, linux-oem-20.04, linux-tools-oem-20.04-edge,
linux-tools-5.10.0-1051-oem, linux-image-oem-20.04,
linux-oem-5.10-tools-5.10.0-1051, linux-oem-20.04b,
linux-headers-5.10.0-1051-oem, linux-oem-5.10,
linux-image-unsigned-5.10.0-1051-oem, linux-image-oem-20.04b,
linux-headers-oem-20.04-edge, linux-modules-5.10.0-1051-oem,
linux-oem-5.10-headers-5.10.0-1051, linux-headers-oem-20.04,
linux-image-oem-20.04-edge, linux-headers-oem-20.04b,
linux-tools-oem-20.04, linux-buildinfo-5.10.0-1051-oem,
linux-oem-5.10-tools-host
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