USN-5137-2: Linux kernel vulnerabilities
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Ubuntu Security Notice USN-5137-2
November 11, 2021
linux-bluefield, linux-gke-5.4, linux-oracle, linux-oracle-5.4
vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- linux-bluefield: Linux kernel for NVIDIA BlueField platforms
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-gke-5.4: Linux kernel for Google Container Engine (GKE) systems
- linux-oracle-5.4: Linux kernel for Oracle Cloud systems
Details:
It was discovered that the f2fs file system in the Linux kernel did not
properly validate metadata in some situations. An attacker could use this
to construct a malicious f2fs image that, when mounted and operated on,
could cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2019-19449)
It was discovered that the Infiniband RDMA userspace connection manager
implementation in the Linux kernel contained a race condition leading to a
use-after-free vulnerability. A local attacker could use this to cause a
denial of service (system crash) or possible execute arbitrary code.
(CVE-2020-36385)
Wolfgang Frisch discovered that the ext4 file system implementation in the
Linux kernel contained an integer overflow when handling metadata inode
extents. An attacker could use this to construct a malicious ext4 file
system image that, when mounted, could cause a denial of service (system
crash). (CVE-2021-3428)
Benedict Schlueter discovered that the BPF subsystem in the Linux kernel
did not properly protect against Speculative 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 Speculative 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 btrfs file system in the Linux kernel did not
properly handle removing a non-existent device id. An attacker with
CAP_SYS_ADMIN could use this to cause a denial of service. (CVE-2021-3739)
It was discovered that the Qualcomm IPC Router protocol implementation in
the Linux kernel did not properly validate metadata in some situations. A
local attacker could use this to cause a denial of service (system crash)
or expose sensitive information. (CVE-2021-3743)
It was discovered that the virtual terminal (vt) device implementation in
the Linux kernel contained a race condition in its ioctl handling that led
to an out-of-bounds read vulnerability. A local attacker could possibly use
this to expose sensitive information. (CVE-2021-3753)
It was discovered that the Linux kernel did not properly account for the
memory usage of certain IPC objects. A local attacker could use this to
cause a denial of service (memory exhaustion). (CVE-2021-3759)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.04 LTS:
linux-image-5.4.0-1021-bluefield 5.4.0-1021.24
linux-image-5.4.0-1057-oracle 5.4.0-1057.61
linux-image-bluefield 5.4.0.1021.22
linux-image-oracle-lts-20.04 5.4.0.1057.57
Ubuntu 18.04 LTS:
linux-image-5.4.0-1055-gke 5.4.0-1055.58~18.04.1
linux-image-5.4.0-1057-oracle 5.4.0-1057.61~18.04.1
linux-image-gke-5.4 5.4.0.1055.58~18.04.20
linux-image-oracle 5.4.0.1057.61~18.04.37
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-5137-2
https://ubuntu.com/security/notices/USN-5137-1
CVE-2019-19449, CVE-2020-36385, CVE-2021-3428, CVE-2021-34556,
CVE-2021-35477, CVE-2021-3739, CVE-2021-3743, CVE-2021-3753,
CVE-2021-3759
Package Information:
https://launchpad.net/ubuntu/+source/linux-bluefield/5.4.0-1021.24
https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1057.61
https://launchpad.net/ubuntu/+source/linux-gke-5.4/5.4.0-1055.58~18.04.1
https://launchpad.net/ubuntu/+source/linux-oracle-5.4/5.4.0-1057.61~18.04.1
A Linux kernel security update has been released for Ubuntu Linux 18.04 LTS and 20.04 LTS.
