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Vulnerability of Linux kernel: NULL pointer dereference via llcp_sock_getname

Synthesis of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via llcp_sock_getname of the Linux kernel, in order to trigger a denial of service.
Impacted systems: Fedora, Linux.
Severity of this alert: 1/4.
Creation date: 01/06/2021.
Références of this alert: CVE-2021-3587, FEDORA-2021-bc2a819bc5, FEDORA-2021-db2bb87f35, VIGILANCE-VUL-35573.

Description of the vulnerability 

An attacker can force a NULL pointer to be dereferenced via llcp_sock_getname 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.

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 5.12.10.
The version 5.12.10 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.10.43.
The version 5.10.43 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 5.4.125.
The version 5.4.125 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v5.x/

Linux kernel: version 4.19.194.
The version 4.19.194 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.14.236.
The version 4.14.236 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.9.272.
The version 4.9.272 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

Linux kernel: version 4.4.272.
The version 4.4.272 is fixed:
  https://cdn.kernel.org/pub/linux/kernel/v4.x/

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

Fedora 33-34: new kernel packages.
New packages are available:
  Fedora 33: kernel 5.12.10-200.fc33
  Fedora 34: kernel 5.12.10-300.fc34

Fedora 33-34: new kernel-tools packages.
New packages are available:
  Fedora 33: kernel-tools 5.12.10-200.fc33
  Fedora 34: kernel-tools 5.12.10-300.fc34
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