QID 239764

Date Published: 2021-11-03

QID 239764: Red Hat Update for samba (RHSA-2021:4058)

samba is an open-source implementation of the server message block (smb) protocol and the related common internet file system (cifs) protocol, which allow pc-compatible machines to share files, printers, and various information.

Security Fix(es):
  • samba: negative idmap cache entries can cause incorrect group entries in the samba file server process token (cve-2021-20254)

Affected Products:

  • Red Hat enterprise linux for x86_64 - extended update support 8.4 x86_64
  • Red Hat enterprise linux server - aus 8.4 x86_64
  • Red Hat enterprise linux for ibm z systems 8 s390x
  • Red Hat enterprise linux for ibm z systems - extended update support 8.4 s390x
  • Red Hat enterprise linux for power, little endian 8 ppc64le
  • Red Hat enterprise linux for power, little endian - extended update support 8.4 ppc64le
  • Red Hat virtualization host 4 for rhel 8 x86_64
  • Red Hat enterprise linux for x86_64 8 x86_64
  • Red Hat enterprise linux server - tus 8.4 x86_64
  • Red Hat enterprise linux for arm 64 8 aarch64
  • Red Hat enterprise linux server (for ibm power le) - update services for sap solutions 8.4 ppc64le
  • Red Hat codeready linux builder for ibm z systems - extended update support 8.4 s390x
  • Red Hat codeready linux builder for arm 64 - extended update support 8.4 aarch64



Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

On successful exploitation, it could allow an attacker to execute code.

  • CVSS V3 rated as High - 6.8 severity.
  • CVSS V2 rated as Medium - 4.9 severity.
    • Solution
    Upgrade to the latest packages which contain a patch.

    Refer to Refer to :
    Applying Package Updates to RHEL system     for details.

    Refer to Red Hat security advisory RHSA-2021:4058 Update to address this issue and obtain more information.

    Vendor References

    CVEs related to QID 239764

    CVE-2021-20254 |
    Software Advisories
    Advisory ID Software Component Link
    RHSA-2021:4058 Red Hat Enterprise Linux URL Logo access.redhat.com/errata/RHSA-2021:4058
    By selecting these links, you may be leaving CVEreport webspace. We have provided these links to other websites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other websites that are more appropriate for your purpose. CVEreport does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, CVEreport does not endorse any commercial products that may be mentioned on these sites. Please address comments about any linked pages to [email protected].
    © CVE.report 2026 |

    Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

    CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

    Free CVE JSON API cve.report/api

    CVE.report and Source URL Uptime Status status.cve.report