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Ubuntu Security Notice USN-5092-2

Ubuntu Security Notice USN-5092-2
Posted Sep 29, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5092-2 - Valentina Palmiotti discovered that the io_uring subsystem in the Linux kernel could be coerced to free adjacent memory. A local attacker could use this to execute arbitrary code. Ofek Kirzner, Adam Morrison, Benedict Schlueter, and Piotr Krysiuk discovered that the BPF verifier in the Linux kernel missed possible mispredicted branches due to type confusion, allowing a side-channel attack. An attacker could use this to expose sensitive information. Various other issues were also addressed.

tags | advisory, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2021-33624, CVE-2021-34556, CVE-2021-35477, CVE-2021-3679, CVE-2021-37159, CVE-2021-37576, CVE-2021-38160, CVE-2021-38199, CVE-2021-38201, CVE-2021-38204, CVE-2021-38205, CVE-2021-41073
SHA-256 | fe6e6f7b890fe9c454e6d8b6981a93e9900e3e12cc8de38080233a23b6f9f395

Ubuntu Security Notice USN-5092-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5092-2
September 29, 2021

linux-hwe-5.11, linux-azure, linux-azure-5.11, linux-oracle-5.11
vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.04
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-signed-azure: Signed kernel image azure
- linux-azure-5.11: Linux kernel for Microsoft Azure cloud systems
- linux-hwe-5.11: Linux hardware enablement (HWE) kernel
- linux-oracle-5.11: Linux kernel for Oracle Cloud systems

Details:

Valentina Palmiotti discovered that the io_uring subsystem in the Linux
kernel could be coerced to free adjacent memory. A local attacker could use
this to execute arbitrary code. (CVE-2021-41073)

Ofek Kirzner, Adam Morrison, Benedict Schlueter, and Piotr Krysiuk
discovered that the BPF verifier in the Linux kernel missed possible
mispredicted branches due to type confusion, allowing a side-channel
attack. An attacker could use this to expose sensitive information.
(CVE-2021-33624)

Benedict Schlueter discovered that the BPF subsystem in the Linux kernel
did not properly protect against Speculatively Store Bypass (SSB) side-
channel attacks in some situations. A local attacker could possibly use
this to expose sensitive information. (CVE-2021-34556)

Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not
properly protect against Speculatively Store Bypass (SSB) side-channel
attacks in some situations. A local attacker could possibly use this to
expose sensitive information. (CVE-2021-35477)

It was discovered that the tracing subsystem in the Linux kernel did not
properly keep track of per-cpu ring buffer state. A privileged attacker
could use this to cause a denial of service. (CVE-2021-3679)

It was discovered that the Option USB High Speed Mobile device driver in
the Linux kernel did not properly handle error conditions. A physically
proximate attacker could use this to cause a denial of service (system
crash) or possibly execute arbitrary code. (CVE-2021-37159)

Alexey Kardashevskiy discovered that the KVM implementation for PowerPC
systems in the Linux kernel did not properly validate RTAS arguments in
some situations. An attacker in a guest vm could use this to cause a denial
of service (host OS crash) or possibly execute arbitrary code.
(CVE-2021-37576)

It was discovered that the Virtio console implementation in the Linux
kernel did not properly validate input lengths in some situations. A local
attacker could possibly use this to cause a denial of service (system
crash). (CVE-2021-38160)

Michael Wakabayashi discovered that the NFSv4 client implementation in the
Linux kernel did not properly order connection setup operations. An
attacker controlling a remote NFS server could use this to cause a denial
of service on the client. (CVE-2021-38199)

It was discovered that the Sun RPC implementation in the Linux kernel
contained an out-of-bounds access error. A remote attacker could possibly
use this to cause a denial of service (system crash). (CVE-2021-38201)

It was discovered that the MAX-3421 host USB device driver in the Linux
kernel did not properly handle device removal events. A physically
proximate attacker could use this to cause a denial of service (system
crash). (CVE-2021-38204)

It was discovered that the Xilinx 10/100 Ethernet Lite device driver in the
Linux kernel could report pointer addresses in some situations. An attacker
could use this information to ease the exploitation of another
vulnerability. (CVE-2021-38205)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 21.04:
linux-image-5.11.0-1017-azure 5.11.0-1017.18
linux-image-azure 5.11.0.1017.18

Ubuntu 20.04 LTS:
linux-image-5.11.0-1017-azure 5.11.0-1017.18~20.04.1
linux-image-5.11.0-1019-oracle 5.11.0-1019.20~20.04.1
linux-image-5.11.0-37-generic 5.11.0-37.41~20.04.2
linux-image-5.11.0-37-generic-64k 5.11.0-37.41~20.04.2
linux-image-5.11.0-37-generic-lpae 5.11.0-37.41~20.04.2
linux-image-5.11.0-37-lowlatency 5.11.0-37.41~20.04.2
linux-image-azure-edge 5.11.0.1017.18~20.04.16
linux-image-generic-64k-hwe-20.04 5.11.0.37.41~20.04.16
linux-image-generic-hwe-20.04 5.11.0.37.41~20.04.16
linux-image-generic-lpae-hwe-20.04 5.11.0.37.41~20.04.16
linux-image-lowlatency-hwe-20.04 5.11.0.37.41~20.04.16
linux-image-oracle 5.11.0.1019.20~20.04.12
linux-image-virtual-hwe-20.04 5.11.0.37.41~20.04.16

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:
https://ubuntu.com/security/notices/USN-5092-2
https://ubuntu.com/security/notices/USN-5092-1
CVE-2021-33624, CVE-2021-34556, CVE-2021-35477, CVE-2021-3679,
CVE-2021-37159, CVE-2021-37576, CVE-2021-38160, CVE-2021-38199,
CVE-2021-38201, CVE-2021-38204, CVE-2021-38205, CVE-2021-41073

Package Information:
https://launchpad.net/ubuntu/+source/linux-azure/5.11.0-1017.18
https://launchpad.net/ubuntu/+source/linux-signed-azure/5.11.0-1017.18
https://launchpad.net/ubuntu/+source/linux-azure-5.11/5.11.0-1017.18~20.04.1
https://launchpad.net/ubuntu/+source/linux-hwe-5.11/5.11.0-37.41~20.04.2
https://launchpad.net/ubuntu/+source/linux-oracle-5.11/5.11.0-1019.20~20.04.1

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