High 2026-08-06

Kernel-Rt Security Update — AlmaLinux 8 (ALSA-2026:50979)

AlmaLinux 8

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): * kernel: xen: AMD Zen 2 Processors: Privilege escalation via improper CPU cache isolation (CVE-2025-54518) Bug Fix(es) and Enhancement(s): *…

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

* kernel: xen: AMD Zen 2 Processors: Privilege escalation via improper CPU cache isolation (CVE-2025-54518)

Bug Fix(es) and Enhancement(s):

*…

Type:

security

Severity:

important

Release date:

2026-08-06

Description:

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.  
Security Fix(es):  
  * kernel: xen: AMD Zen 2 Processors: Privilege escalation via improper CPU cache isolation (CVE-2025-54518)
Bug Fix(es) and Enhancement(s):  
  * Kernel crash in bpf_for_each_array_elem() due to missing backport of upstream commit 4b6313cf99b0 (JIRA:AlmaLinux-191844)

  * gfs2: xfstests generic/363 failure [almalinux-8.10.z] (JIRA:AlmaLinux-214099)

  * AlmaLinux8: HYPERV hv_storvsc driver can we add additional code to allow PERSISTENT_RESERVE_IN [AlmaLinux 8.10Z] (JIRA:AlmaLinux-188270)
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.

References:

Updated packages listed below:

Architecture	Package	Checksum
x86_64	kernel-rt-core-4.18.0-553.153.1.rt7.494.el8_10.x86_64.rpm	45597ae2b2523f8a8737a1d91a42e0804aff58a38ba8781a91056efb810d7a21
x86_64	kernel-rt-debug-modules-extra-4.18.0-553.153.1.rt7.494.el8_10.x86_64.rpm	6bbf17f31e8184771c37fdde6f1ea862081a49e467fd72d341355943d4d8d17f
x86_64	kernel-rt-4.18.0-553.153.1.rt7.494.el8_10.x86_64.rpm	6fbc2156be6d472e199e0e9b47ac9e00ac7521670389d4c9f7874a0b3986a5fb
x86_64	kernel-rt-debug-modules-4.18.0-553.153.1.rt7.494.el8_10.x86_64.rpm	701576e6594c58c2e28bf740ca866d1fa2c675c538b70ccca04d97e234a63451
x86_64	kernel-rt-debug-core-4.18.0-553.153.1.rt7.494.el8_10.x86_64.rpm	7d1c555cfd9e874aefb18bd25282da7775f30bae91a0e792ec43dd07e4ae2ed4
x86_64	kernel-rt-modules-4.18.0-553.153.1.rt7.494.el8_10.x86_64.rpm	7e0a8b547d35bce58d1067b61ee9f0bf71ecadd5ac74d14349b123d54a5e1069
x86_64	kernel-rt-debug-4.18.0-553.153.1.rt7.494.el8_10.x86_64.rpm	89a71c0015a4568192baf07d53455c8ee3519ed9a77861704ec56fea8c6eceee
x86_64	kernel-rt-devel-4.18.0-553.153.1.rt7.494.el8_10.x86_64.rpm	f3b0b9998dcaaeef64a1d6b6d4fda2aea003b5d28cb5a10c5784e521ba880288
x86_64	kernel-rt-modules-extra-4.18.0-553.153.1.rt7.494.el8_10.x86_64.rpm	f861dcb4c6a865f844b861f0e29b129670ea866cf51e08aff43bdb06ce2ed103
x86_64	kernel-rt-debug-devel-4.18.0-553.153.1.rt7.494.el8_10.x86_64.rpm	f9ff6b9051477d5abe9005a2befe78a71e1f3c17d9a6c3b997d70e7481c31ac5

Notes:

This page is generated automatically from Red Hat security data and has not been checked for errors. For clarification or corrections please contact the AlmaLinux Packaging Team.

How to Apply the Fix

Update the affected packages on your server to the patched release, then restart the relevant services.

sudo dnf update

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