CVE-2020-35513

Description

A flaw incorrect umask during file or directory modification in the Linux kernel NFS (network file system) functionality was found in the way user create and delete object using NFSv4.2 or newer if both simultaneously accessing the NFS by the other process that is not using new NFSv4.2. A user with access to the NFS could use this flaw to starve the resources causing denial of service.

CVSS Metrics

• v3.1•MEDIUM•Score: 4.9CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
• v2.0•MEDIUM•Score: 4AV:N/AC:L/Au:S/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 0.32%• Percentile: 55%

Techniques & Countermeasures

• CWE-271•Privilege Dropping / Lowering Errors

  The product does not drop privileges before passing control of a resource to an actor that does not have those privileges.

Affected Systems

• linux•linux_kernel

  4.2

• redhat•enterprise_linux

  7.0

References (2)

• https://bugzilla.redhat.com/show_bug.cgi?id=1911309
• https://patchwork.kernel.org/project/linux-nfs/patch/20180403203916.GH20297%40fieldses.org/