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Vulnerability of Linux kernel: denial of service via intel_pmu_drain_pebs_nhm

Synthesis of the vulnerability 

An attacker can trigger a fatal error via intel_pmu_drain_pebs_nhm() of the Linux kernel, in order to trigger a denial of service.
Impacted systems: Fedora, Linux, openSUSE Leap.
Severity of this alert: 1/4.
Creation date: 23/03/2021.
Références of this alert: CVE-2021-28971, FEDORA-2021-68b0dd2373, FEDORA-2021-9503fffad9, openSUSE-SU-2021:0532-1, VIGILANCE-VUL-34913.

Description of the vulnerability 

An attacker can trigger a fatal error via intel_pmu_drain_pebs_nhm() of the Linux kernel, in order to trigger a denial of service.
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This security weakness impacts software or systems such as Fedora, Linux, openSUSE Leap.

Our Vigil@nce team determined that the severity of this threat bulletin 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 threat.

Solutions for this threat 

Linux kernel: version 5.11.9.
The version 5.11.9 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.10.26.
The version 5.10.26 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.108.
The version 5.4.108 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.183.
The version 4.19.183 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.227.
The version 4.14.227 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.263.
The version 4.9.263 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

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

Fedora 32-33: new kernel packages.
New packages are available:
  Fedora 32: kernel 5.11.10-100.fc32
  Fedora 33: kernel 5.11.9-200.fc33

openSUSE Leap 15.2: new kernel packages.
New packages are available:
  openSUSE Leap 15.2: kernel 5.3.18-lp152.69.1
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