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Vulnerability of Linux kernel: denial of service via NFS Umask

Synthesis of the vulnerability 

An attacker can trigger a fatal error via NFS Umask of the Linux kernel, in order to trigger a denial of service.
Vulnerable products: Tivoli Storage Manager, Linux, RHEL.
Severity of this weakness: 1/4.
Creation date: 02/02/2021.
Références of this bulletin: 6445699, CERTFR-2021-AVI-078, CVE-2020-35513, RHBUG-1911309, RHSA-2021:0336-01, RHSA-2021:0338-01, VIGILANCE-VUL-34458.

Description of the vulnerability 

An attacker can trigger a fatal error via NFS Umask of the Linux kernel, in order to trigger a denial of service.
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This weakness note impacts software or systems such as Tivoli Storage Manager, Linux, RHEL.

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

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

An attacker with a expert ability can exploit this computer weakness.

Solutions for this threat 

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

IBM Spectrum Protect Plus: solution for Linux.
The solution is indicated in information sources.

RHEL 7: new kernel packages.
New packages are available:
  RHEL 7.0-7.9: kernel 3.10.0-1160.15.2.el7

RHEL 7: new kernel-rt packages.
New packages are available:
  RHEL 7.0-7.9: kernel-rt 3.10.0-1160.15.2.rt56.1152.el7
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