RHSA-2021:4788MediumCVSS 6.5

Red Hat Security Advisory: krb5 security update

Published
November 23, 2021
Last Modified
August 4, 2026

🔗 CVE IDs covered (1)

CVE-2021-37750 →

📋 Description

CVE-2021-37750 — krb5: NULL pointer dereference in process_tgs_req() in kdc/do_tgs_req.c via a FAST inner body that lacks server field

🎯 Affected products84

  • Red Hat Enterprise Linux Client (v. 7)
  • Red Hat Enterprise Linux Client Optional (v. 7)
  • Red Hat Enterprise Linux ComputeNode Optional (v. 7)
  • Red Hat Enterprise Linux Server (v. 7)
  • Red Hat Enterprise Linux Workstation (v. 7)
  • krb5-0:1.15.1-51.el7_9.src as a component of Red Hat Enterprise Linux Client (v. 7)
  • krb5-0:1.15.1-51.el7_9.src as a component of Red Hat Enterprise Linux Server (v. 7)
  • krb5-0:1.15.1-51.el7_9.src as a component of Red Hat Enterprise Linux Workstation (v. 7)
  • krb5-debuginfo-0:1.15.1-51.el7_9.i686 as a component of Red Hat Enterprise Linux Client (v. 7)
  • krb5-debuginfo-0:1.15.1-51.el7_9.i686 as a component of Red Hat Enterprise Linux Client Optional (v. 7)
  • krb5-debuginfo-0:1.15.1-51.el7_9.i686 as a component of Red Hat Enterprise Linux ComputeNode Optional (v. 7)
  • krb5-debuginfo-0:1.15.1-51.el7_9.i686 as a component of Red Hat Enterprise Linux Server (v. 7)
  • krb5-debuginfo-0:1.15.1-51.el7_9.i686 as a component of Red Hat Enterprise Linux Workstation (v. 7)
  • krb5-debuginfo-0:1.15.1-51.el7_9.ppc as a component of Red Hat Enterprise Linux Server (v. 7)
  • krb5-debuginfo-0:1.15.1-51.el7_9.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • krb5-debuginfo-0:1.15.1-51.el7_9.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)
  • krb5-debuginfo-0:1.15.1-51.el7_9.s390 as a component of Red Hat Enterprise Linux Server (v. 7)
  • krb5-debuginfo-0:1.15.1-51.el7_9.s390x as a component of Red Hat Enterprise Linux Server (v. 7)
  • krb5-debuginfo-0:1.15.1-51.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7)
  • krb5-debuginfo-0:1.15.1-51.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client Optional (v. 7)
  • krb5-debuginfo-0:1.15.1-51.el7_9.x86_64 as a component of Red Hat Enterprise Linux ComputeNode Optional (v. 7)
  • krb5-debuginfo-0:1.15.1-51.el7_9.x86_64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • krb5-debuginfo-0:1.15.1-51.el7_9.x86_64 as a component of Red Hat Enterprise Linux Workstation (v. 7)
  • krb5-devel-0:1.15.1-51.el7_9.i686 as a component of Red Hat Enterprise Linux Client Optional (v. 7)
  • krb5-devel-0:1.15.1-51.el7_9.i686 as a component of Red Hat Enterprise Linux ComputeNode Optional (v. 7)
  • krb5-devel-0:1.15.1-51.el7_9.i686 as a component of Red Hat Enterprise Linux Server (v. 7)
  • krb5-devel-0:1.15.1-51.el7_9.i686 as a component of Red Hat Enterprise Linux Workstation (v. 7)
  • krb5-devel-0:1.15.1-51.el7_9.ppc as a component of Red Hat Enterprise Linux Server (v. 7)
  • krb5-devel-0:1.15.1-51.el7_9.ppc64 as a component of Red Hat Enterprise Linux Server (v. 7)
  • krb5-devel-0:1.15.1-51.el7_9.ppc64le as a component of Red Hat Enterprise Linux Server (v. 7)
  • +54 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the updated packages, running Kerberos services (krb5kdc, kadmin, and kprop) will be restarted automatically.

🔗 References (4)