A Linux kernel security update has been released for Ubuntu Linux 21.04.
==========================================================================
Ubuntu Security Notice USN-4997-1
June 23, 2021
linux, linux-aws, linux-azure, linux-gcp, linux-oracle, linux-raspi
vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 21.04
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi: Linux kernel for Raspberry Pi (V8) systems
Details:
Norbert Slusarek discovered a race condition in the CAN BCM networking
protocol of the Linux kernel leading to multiple use-after-free
vulnerabilities. A local attacker could use this issue to execute arbitrary
code. (CVE-2021-3609)
Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel
did not properly enforce limits for pointer operations. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2021-33200)
Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did
not properly clear received fragments from memory in some situations. A
physically proximate attacker could possibly use this issue to inject
packets or expose sensitive information. (CVE-2020-24586)
Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation
incorrectly handled encrypted fragments. A physically proximate attacker
could possibly use this issue to decrypt fragments. (CVE-2020-24587)
Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation
incorrectly handled certain malformed frames. If a user were tricked into
connecting to a malicious server, a physically proximate attacker could use
this issue to inject packets. (CVE-2020-24588)
Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation
incorrectly handled EAPOL frames from unauthenticated senders. A physically
proximate attacker could inject malicious packets to cause a denial of
service (system crash). (CVE-2020-26139)
Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did
not properly verify certain fragmented frames. A physically proximate
attacker could possibly use this issue to inject or decrypt packets.
(CVE-2020-26141)
Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation
accepted plaintext fragments in certain situations. A physically proximate
attacker could use this issue to inject packets. (CVE-2020-26145)
Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation could
reassemble mixed encrypted and plaintext fragments. A physically proximate
attacker could possibly use this issue to inject packets or exfiltrate
selected fragments. (CVE-2020-26147)
Or Cohen discovered that the SCTP implementation in the Linux kernel
contained a race condition in some situations, leading to a use-after-free
condition. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2021-23133)
Or Cohen and Nadav Markus discovered a use-after-free vulnerability in the
nfc implementation in the Linux kernel. A privileged local attacker could
use this issue to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2021-23134)
Manfred Paul discovered that the extended Berkeley Packet Filter (eBPF)
implementation in the Linux kernel contained an out-of-bounds
vulnerability. A local attacker could use this issue to execute arbitrary
code. (CVE-2021-31440)
Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel
did not properly prevent speculative loads in certain situations. A local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2021-31829)
It was discovered that a race condition in the kernel Bluetooth subsystem
could lead to use-after-free of slab objects. An attacker could use this
issue to possibly execute arbitrary code. (CVE-2021-32399)
It was discovered that a use-after-free existed in the Bluetooth HCI driver
of the Linux kernel. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2021-33034)
It was discovered that an out-of-bounds (OOB) memory access flaw existed in
the f2fs module of the Linux kernel. A local attacker could use this issue
to cause a denial of service (system crash). (CVE-2021-3506)
Mathias Krause discovered that a null pointer dereference existed in the
Nitro Enclaves kernel driver of the Linux kernel. A local attacker could
use this issue to cause a denial of service or possibly execute arbitrary
code. (CVE-2021-3543)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 21.04:
linux-image-5.11.0-1009-azure 5.11.0-1009.9
linux-image-5.11.0-1010-oracle 5.11.0-1010.10
linux-image-5.11.0-1011-aws 5.11.0-1011.11
linux-image-5.11.0-1011-gcp 5.11.0-1011.12
linux-image-5.11.0-1012-raspi 5.11.0-1012.13
linux-image-5.11.0-1012-raspi-nolpae 5.11.0-1012.13
linux-image-5.11.0-22-generic 5.11.0-22.23
linux-image-5.11.0-22-generic-64k 5.11.0-22.23
linux-image-5.11.0-22-generic-lpae 5.11.0-22.23
linux-image-5.11.0-22-lowlatency 5.11.0-22.23
linux-image-aws 5.11.0.1011.11
linux-image-azure 5.11.0.1009.9
linux-image-gcp 5.11.0.1011.11
linux-image-generic 5.11.0.22.23
linux-image-generic-64k 5.11.0.22.23
linux-image-generic-lpae 5.11.0.22.23
linux-image-gke 5.11.0.1011.11
linux-image-lowlatency 5.11.0.22.23
linux-image-oracle 5.11.0.1010.10
linux-image-raspi 5.11.0.1012.10
linux-image-raspi-nolpae 5.11.0.1012.10
linux-image-virtual 5.11.0.22.23
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-4997-1
CVE-2020-24586, CVE-2020-24587, CVE-2020-24588, CVE-2020-26139,
CVE-2020-26141, CVE-2020-26145, CVE-2020-26147, CVE-2021-23133,
CVE-2021-23134, CVE-2021-31440, CVE-2021-31829, CVE-2021-32399,
CVE-2021-33034, CVE-2021-33200, CVE-2021-3506, CVE-2021-3543,
CVE-2021-3609
Package Information:
https://launchpad.net/ubuntu/+source/linux/5.11.0-22.23
https://launchpad.net/ubuntu/+source/linux-aws/5.11.0-1011.11
https://launchpad.net/ubuntu/+source/linux-azure/5.11.0-1009.9
https://launchpad.net/ubuntu/+source/linux-gcp/5.11.0-1011.12
https://launchpad.net/ubuntu/+source/linux-oracle/5.11.0-1010.10
https://launchpad.net/ubuntu/+source/linux-raspi/5.11.0-1012.13
