CVE-2020-10711

Advisory lineage Upstream: 0 Downstream: 47
Modified
Published: 22 May 2020, 14:09
Last modified:04 Aug 2024, 11:14

Vulnerability Summary

Overall Risk (default)
medium
25/100
CVSS Score
5.9 MEDIUM
v3.1 (cve.org)
EPSS Score
5.44% LOW
5% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

22 May 2020, 14:09
Published
Vulnerability first disclosed
04 Aug 2024, 11:14
Last Modified
Vulnerability information updated

Description

A NULL pointer dereference flaw was found in the Linux kernel's SELinux subsystem in versions before 5.7. This flaw occurs while importing the Commercial IP Security Option (CIPSO) protocol's category bitmap into the SELinux extensible bitmap via the' ebitmap_netlbl_import' routine. While processing the CIPSO restricted bitmap tag in the 'cipso_v4_parsetag_rbm' routine, it sets the security attribute to indicate that the category bitmap is present, even if it has not been allocated. This issue leads to a NULL pointer dereference issue while importing the same category bitmap into SELinux. This flaw allows a remote network user to crash the system kernel, resulting in a denial of service.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  • v2.0•MEDIUM•Score: 4.3AV:N/AC:M/Au:N/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 5.44%• Percentile: 90%

Techniques & Countermeasures

  • CWE-476•NULL Pointer Dereference

    The product dereferences a pointer that it expects to be valid but is NULL.

Affected Systems

  • canonical•ubuntu_linux

    14.04 | 16.04 | 18.04 | 19.10 | 20.04

  • debian•debian_linux

    8.0 | 9.0 | 10.0

  • linux•linux_kernel

    < 5.7

  • opensuse•leap

    15.1 | 15.2

  • red hat•kernel

    all kernel versions before 5.7

  • redhat•3scale

    2.0

  • redhat•enterprise_linux

    6.0 | 7.0 | 8.0

  • redhat•enterprise_linux_aus

    7.4

  • redhat•enterprise_linux_server_tus

    7.4

  • redhat•messaging_realtime_grid

    2.0

  • redhat•openstack

    13

  • redhat•virtualization_host

    4.0

References (13)