[QSA-0801262]
Security Update Bundle

Qlustar Security Advisory 0801262

August 1st, 2026

Summary:

A Qlustar security update bundle is a cumulative update of packages that are taken from upstream Debian/Ubuntu without modification. Only packages that are used in a typical HPC/Storage cluster installation are mentioned in Qlustar Security Advisories. Other non-HPC related updates also enter the Qlustar repository, but their functionality is not separately verified by the Qlustar team. To track these updates subscribe to the general security mailing lists of Debian/Ubuntu and/or AlmaLinux.

Package(s)       : see upstream description of individual package
Qlustar releases : 13, 14
Affected versions: All versions prior to this update
Vulnerability    : see upstream description of individual package
Problem type     : see upstream description of individual package
Qlustar-specific : no
CVE Id(s)        : see upstream description of individual package

This update includes several security related package updates from Debian/Ubuntu and AlmaLinux. The following list provides references to the upstream security report of the corresponding packages. You can view the original upstream advisory by clicking on the corresponding title.

Relevant to Qlustar 13 and/or 14 – Ubuntu

If an advisory applies only to Qlustar 13 or 14, it is noted in its description.

OpenSSL vulnerability

It was discovered that OpenSSL incorrectly allocated memory buffers in the SSL/TLS state machine when receiving handshake data. A remote attacker could possibly use this issue to cause OpenSSL to consume excessive memory, leading to a denial of service. This issue is known as the “HollowByte” denial of service.

Samba vulnerabilities

It was discovered that Samba’s pam_winbind incorrectly handled home directory ownership when mkhomedir was enabled. A local attacker could possibly use this issue to cause a denial of service by triggering a change in ownership of the root directory.

Arjun Basnet, Douglas Bagnall, and Andrew Tridgell discovered that Samba incorrectly handled TSIG packets with name compression. A remote attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service.

Tristan Madani discovered that Samba incorrectly handled malformed ASN.1 kpasswd packets. An authenticated user could possibly use this issue to cause Samba to crash, resulting in a denial of service.

Andrew Tridgell and Tristan Madani discovered that Samba incorrectly handled TKEY name registration. A remote attacker could possibly use this issue to exhaust the TKEY name cache, resulting in a denial of service.

It was discovered that Samba incorrectly handled internal LDB special directory names when processing authenticated LDAP requests. An authenticated user could possibly use this issue to perform unauthorized modifications and gain control of a domain.

Andrew Tridgell and Tristan Madani discovered that Samba incorrectly handled LDAP Compare requests. An authenticated user could possibly use this issue to obtain sensitive information.

Tristan Madani, Andrew Tridgell, and Martin Schwenke discovered that the CTDB protocol in Samba had insufficient bounds checking. A remote attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service.

FreeIPMI vulnerabilities

Zhihan Zheng discovered that FreeIPMI had several buffer overflow vulnerabilities in ipmi-oem response message handling. A local attacker with control a malicious IPMI device or simulator could possibly cause FreeIPMI to crash, resulting in a denial of service.

GNU C Library vulnerabilities

It was discovered that the GNU C Library iconv function incorrectly handled certain IBM character sets. An attacker could possibly use this issue to cause a denial of service.

It was discovered that the GNU C Library DNS functions incorrectly handled certain DNS server responses when using gethostbyaddr or gethostbyaddr_r. An attacker in a privileged network position could possibly use this issue to cause an application to violate DNS specification or obtain incorrect hostname information. This issue only affected Qlustar 14.

It was discovered that the GNU C Library deprecated debugging functions incorrectly enforced caller-supplied buffer lengths. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code.

It was discovered that the GNU C Library scanf family of functions contained a heap buffer overflow when processing certain format specifiers. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code.

It was discovered that the GNU C Library ungetwc function incorrectly handled certain character encodings. An attacker could possibly use this issue to obtain sensitive information or cause a denial of service.

It was discovered that the GNU C Library deprecated debugging functions incorrectly validated DNS response record data. An attacker could possibly use this issue to cause a denial of service or obtain sensitive information.

AlmaLinux 8.10 security updates

Please check the AlmaLinux Errata site for details about AlmaLinux 8 updates that entered this release (everything from July 24th until July 30th).

Update instructions:

The problem can be corrected by updating your system to the following or more recent package versions:

For Qlustar 14

qlustar-module-core-noble-amd64-14.1       14.1.8-b589f1639
qlustar-module-core-centos8-amd64-14.1     14.1.8-b589f1639

For Qlustar 13

qlustar-module-core-jammy-amd64-13.4       13.4.7-b588f1638

Special Update instructions:

In addition to the steps described in the general Qlustar Update Instructions these updates require the following:

• Spack migration With the release of the HPC Core Stack 02/26, spack was also updated to version 1.1.1. If you haven’t yet migrated your spack database to version 8, login on a cluster node as a user with Spack admin rights (usually user softadm or anybody in the group softadm) and execute

  # spack reindex
  

  Note that after this, older Spack versions will no longer be able to read the database. However, a backup is created in case a revert is needed.

• Please note that we no longer provide 13.x AlmaLinux 8 modules for Qlustar 13. If you want to use AlmaLinux 8 under Qlustar 13, please switch to the 14.x image modules and create a corresponding chroot for it.