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habrok:additional_information:changelog [2026/02/27 10:16] – [2026-02-18] fokkehabrok:additional_information:changelog [2026/04/30 14:45] (current) – pedro
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 This page records major changes to Hábrók, which are mostly carried out during scheduled maintenance periods. This changelog is kept since August 13th 2025, although changes have been made during past scheduled maintenance periods and on-demand as necessary. This page records major changes to Hábrók, which are mostly carried out during scheduled maintenance periods. This changelog is kept since August 13th 2025, although changes have been made during past scheduled maintenance periods and on-demand as necessary.
 +
 +===== 2026-04-29 =====
 +
 +  * On the night of 2026-04-29 a security vulnerability -- [[https://access.redhat.com/security/cve/cve-2026-31431|CVE-2026-31431]] -- was published that affected most Linux systems in operation. This vulnerability allowed obtaining root privileges on systems by running a script that exploited a flaw in Linux's kernel. To prevent this vulnerability from being exploited, we brought down all Hábrók access nodes on the night of 2026-04-29, prevented new jobs from starting in any queue and disabled the web portal. On 2026-04-30, we applied mitigating measures that prevent this vulnerability from being exploited. All idle nodes were immediately patched and rebooted and a mitigating measure that blocks the vulnerability was applied to nodes that still had jobs running, to prevent malicious code from being executed until they are rebooted with a patch. Due to this, these nodes won't accept new jobs and will reboot as soon as they are empty. 
 +  * As of 16:30 the access nodes are available again, the queues are resumed, and users can access the system as usual. Capacity will be reduced until all nodes have finished rebooting. 
 +  * You can follow the timeline of this incident on our [[https://status.hpc.rug.nl/issue/ba5f9dc4-bfb1-4910-aa78-1ff715e551af|status page issue]].
 +
 +===== 2026-04-13 =====
 +
 +  * ''interactive1.hb.hpc.rug.nl'' needed to be reinstalled after a failure. This means its ssh host key has changed. See [[hostkey_fingerprints]] for more information about host keys.
  
 ===== 2026-02-27 ===== ===== 2026-02-27 =====
  
   * New GPU nodes have been made available. See [[..:advanced_job_management:rtx_pro_6000_gpu_nodes]] for details.   * New GPU nodes have been made available. See [[..:advanced_job_management:rtx_pro_6000_gpu_nodes]] for details.
 +  * The default number of threads for OpenBLAS and MKL has been set to 1. This to prevent their automatic parallelization to interfere with the parallelization of the software using these libraries. See [[..:advanced_job_management:blas_threads]] for details.
  
 ===== 2026-02-18 ===== ===== 2026-02-18 =====