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Vulnerability of Linux kernel: use after free via Perf_trace_lock_acquire

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via Perf_trace_lock_acquire of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
Impacted products: Fedora, Linux, Ubuntu.
Severity of this bulletin: 2/4.
Creation date: 13/12/2019.
Références of this threat: 205705, CERTFR-2020-AVI-312, CERTFR-2020-AVI-326, CVE-2019-19769, FEDORA-2020-73c00eda1c, FEDORA-2020-76966b3419, USN-4368-1, USN-4369-1, USN-4369-2, VIGILANCE-VUL-31149.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via Perf_trace_lock_acquire of the Linux kernel, in order to trigger a denial of service, and possibly to run code.
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This weakness announce impacts software or systems such as Fedora, Linux, Ubuntu.

Our Vigil@nce team determined that the severity of this vulnerability alert is medium.

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 announce.

Solutions for this threat 

Linux kernel: version 5.5.12.
The version 5.5.12 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.28.
The version 5.4.28 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: patch for Perf_trace_lock_acquire.
A patch is indicated in information sources.

Fedora 30: new kernel-headers packages.
New packages are available:
  Fedora 30: kernel-headers 5.5.16-100.fc30

Fedora 30: new kernel packages.
New packages are available:
  Fedora 30: kernel 5.5.16-100.fc30

Fedora 30: new kernel-tools packages.
New packages are available:
  Fedora 30: kernel-tools 5.5.16-100.fc30

Fedora 31: new kernel packages.
New packages are available:
  Fedora 31: kernel 5.5.11-200.fc31

Ubuntu 18.04 LTS: new linux-image-5.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-5.0.0-1037-gke 5.0.0-1037.38, linux-image-5.0.0-1052-oem-osp1 5.0.0-1052.57, linux-image-gke-5.0 5.0.0.1037.25, linux-image-oem-osp1 5.0.0.1052.55

Ubuntu: new linux-image-5.3.0 packages.
New packages are available:
  Ubuntu 18.04 LTS: linux-image-generic-hwe-18.04 5.3.0.53.109
  Ubuntu 19.10: linux-image-generic 5.3.0.53.45

Wind River Linux: version 10.19.45.7.
The version 10.19.45.7 is fixed:
  https://support2.windriver.com/
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Computer vulnerabilities tracking service 

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