RHSA-2026:39575 — Security Advisory

An update for cifs-utils is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The SMB/CIFS protocol is a standard file sharing protocol widely deployed on Microsoft Windows machines. The cifs-utils packages contain tools for mounting shares on Linux using the SMB/CIFS protocol. The tools in this package work in conjunction with support in the kernel to allow one to mount a SMB/CIFS share onto a client and use it as if it were a standard Linux file system.

Security Fix(es):

• cifs-utils: local privilege escalation via forged cifs.spnego key description in cifs.upcall (CVE-2026-12505)

Bug Fix(es) and Enhancement(s):

• add sssd method for mapping SID to UID/GID in man page of mount.cifs [rhel-8.10.z] (JIRA:RHEL-41059)

• Update the mount.cifs man page to match the 3*echo_interval reconnection timeout (JIRA:RHEL-80397)

• cifs-utils: regression with kerberos mount [rhel-8.10.z] (JIRA:RHEL-192933)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.