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Vulnerability of IBM Power9 Processor: information disclosure via L1 Cache

Synthesis of the vulnerability 

An attacker can bypass access restrictions to data via L1 Cache of IBM Power9 Processor, in order to obtain sensitive information.
Vulnerable software: Fedora, AIX, IBM i, Power Systems, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity of this announce: 1/4.
Creation date: 20/11/2020.
Références of this computer vulnerability: 6370719, CERTFR-2020-AVI-786, CERTFR-2020-AVI-794, CERTFR-2020-AVI-811, CERTFR-2020-AVI-837, CERTFR-2021-AVI-006, CERTFR-2021-AVI-021, CERTFR-2021-AVI-035, CERTFR-2021-AVI-111, CERTFR-2021-AVI-120, CERTFR-2021-AVI-125, CVE-2020-4788, FEDORA-2020-4700a73bd5, FEDORA-2020-8c15928d23, openSUSE-SU-2020:2161-1, openSUSE-SU-2020:2193-1, openSUSE-SU-2020:2260-1, openSUSE-SU-2021:0075-1, openSUSE-SU-2021:0242-1, SUSE-SU-2020:3713-1, SUSE-SU-2020:3748-1, SUSE-SU-2020:3764-1, SUSE-SU-2020:3766-1, SUSE-SU-2020:3798-1, SUSE-SU-2021:0097-1, SUSE-SU-2021:0098-1, SUSE-SU-2021:0118-1, SUSE-SU-2021:0133-1, SUSE-SU-2021:0434-1, SUSE-SU-2021:0438-1, SUSE-SU-2021:0452-1, SUSE-SU-2021:14630-1, USN-4657-1, USN-4658-1, USN-4658-2, USN-4659-1, USN-4659-2, USN-4660-1, USN-4660-2, USN-4681-1, VIGILANCE-VUL-33943.

Description of the vulnerability 

An attacker can bypass access restrictions to data via L1 Cache of IBM Power9 Processor, in order to obtain sensitive information.
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This vulnerability announce impacts software or systems such as Fedora, AIX, IBM i, Power Systems, Linux, openSUSE Leap, SUSE Linux Enterprise Desktop, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this cybersecurity threat is low.

The trust level is of type confirmed by the editor, with an origin of user shell.

An attacker with a expert ability can exploit this computer threat bulletin.

Solutions for this threat 

Linux kernel: version 5.9.10.
The version 5.9.10 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.79.
The version 5.4.79 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.159.
The version 4.19.159 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.208.
The version 4.14.208 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.245.
The version 4.9.245 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.245.
The version 4.4.245 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

IBM AIX: patch for IBM Power9 L1 Cache.
A patch is indicated in information sources.

IBM i: patch for IBM Power9 L1 Cache.
A patch is indicated in information sources.

Fedora 32, 33: new kernel packages.
New packages are available:
  Fedora 33: kernel 5.9.10-200.fc33
  Fedora 32: kernel 5.9.10-100.fc32

openSUSE Leap 15.1: new kernel packages (07/12/2020).
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.87.1

openSUSE Leap 15.1: new kernel packages (18/01/2021).
New packages are available:
  openSUSE Leap 15.1: kernel 4.12.14-lp151.28.91.1

openSUSE Leap 15.2: new kernel packages (07/12/2020).
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.54.1

openSUSE Leap 15.2: new kernel packages (15/12/2020).
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.57.1.lp152.8.17.1

openSUSE Leap 15.2: new kernel-rt packages.
New packages are available:
  openSUSE Leap 15.2: kernel-rt 5.3.18-lp152.3.5.1

SUSE LE 11 SP4: new kernel packages.
New packages are available:
  SUSE LE 11 SP4: kernel 3.0.101-108.120.1

SUSE LE 12 SP3: new kernel packages (15/02/2021).
New packages are available:
  SUSE LE 12 SP3: kernel 4.4.180-94.138.1

SUSE LE 12 SP4: new kernel packages.
New packages are available:
  SUSE LE 12 SP4: kernel 4.12.14-95.68.1

SUSE LE 12 SP5: new kernel-azure packages (13/01/2021).
New packages are available:
  SUSE LE 12 SP5: kernel-azure 4.12.14-16.41.1

SUSE LE 12 SP5: new kernel packages (15/01/2021).
New packages are available:
  SUSE LE 12 SP5: kernel 4.12.14-122.57.1

SUSE LE 12 SP5: new kernel-rt packages (14/12/2020).
New packages are available:
  SUSE LE 12 SP5: kernel-rt 4.12.14-10.25.1

SUSE LE 15 RTM: new kernel packages.
New packages are available:
  SUSE LE 15 RTM: kernel 4.12.14-150.66.1

SUSE LE 15 SP1: new kernel-azure packages (13/01/2021).
New packages are available:
  SUSE LE 15 SP1: kernel-azure 4.12.14-8.58.1

SUSE LE 15 SP1: new kernel packages (14/01/2021).
New packages are available:
  SUSE LE 15 SP1: kernel 4.12.14-197.78.1

SUSE LE 15 SP1: new kernel-rt packages (15/12/2020).
New packages are available:
  SUSE LE 15 SP1: kernel-rt 4.12.14-14.44.2

SUSE LE 15 SP2: new kernel-azure packages.
New packages are available:
  SUSE LE 15 SP2: kernel-azure 5.3.18-18.29.1

SUSE LE 15 SP2: new kernel packages (11/12/2020).
New packages are available:
  SUSE LE 15 SP2: kernel 5.3.18-24.43.2

SUSE LE 15 SP2: new kernel-rt packages (14/12/2020).
New packages are available:
  SUSE LE 15 SP2: kernel-rt 5.3.18-19.1

Ubuntu 20.10: new linux-image-5.8.0 packages.
New packages are available:
  Ubuntu 20.10: linux-image-generic 5.8.0.33.38

Ubuntu: new linux-image-4.15.0 packages.
New packages are available:
  Ubuntu 14.04 ESM: linux-image-azure 4.15.0.1100.75
  Ubuntu 16.04 LTS: linux-image-generic-hwe-16.04 4.15.0.128.127
  Ubuntu 18.04 LTS: linux-image-generic 4.15.0.128.115

Ubuntu: new linux-image-4.4.0 packages (02/12/2020).
New packages are available:
  Ubuntu 14.04 ESM: linux-image-generic-lpae-lts-xenial 4.4.0.197.172
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.197.203

Ubuntu: new linux-image-4.4.0 packages (06/01/2021).
New packages are available:
  Ubuntu 14.04 ESM: linux-image-generic-lts-xenial 4.4.0.198.173
  Ubuntu 16.04 LTS: linux-image-generic 4.4.0.198.204

Ubuntu: new linux-image-5.4.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.4.0.58.64~18.04.53
  Ubuntu 20.04 LTS: linux-image-generic 5.4.0.58.61
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