High 2026-07-24

Kernel-Rt Security Update — AlmaLinux 8 (ALSA-2026:45116)

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: KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O (CVE-2025-40026) * kernel: xfrm single-frag length not properly …

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: KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O (CVE-2025-40026)
* kernel: xfrm single-frag length not properly …

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: KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O (CVE-2025-40026)
* kernel: xfrm single-frag length not properly …

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: KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O (CVE-2025-40026)
* kernel: xfrm single-frag length not properly …

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: KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O (CVE-2025-40026)
* kernel: xfrm single-frag length not properly …

Type:

security

Severity:

important

Release date:

2026-08-07

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: KVM: x86: Don’t (re)check L1 intercepts when completing userspace I/O (CVE-2025-40026)

  * kernel: xfrm single-frag length not properly limited

  * kernel: dm log: fix out-of-bounds write due to region_count overflow (CVE-2026-53059)

  * kernel: tipc: fix double-free in tipc_buf_append() (CVE-2026-52993)

References:

Updated packages listed below:

Architecture	Package	Checksum
x86_64	kernel-rt-debug-modules-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm	053533f448fc63e4586d316215a55f2339a29b41a59f982b4a023f8e9c8be71a
x86_64	kernel-rt-devel-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm	18a3d8819c23c41e609e8cbbea197285ef64aba5e61dc9289aa1bc4987e00d7e
x86_64	kernel-rt-debug-core-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm	27ac7bfec2781314b0921012a7ce64d3ab8a91b9c71ab903ec3c3ff310425f35
x86_64	kernel-rt-modules-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm	2ed4cd837a4de4700555e5ccffabfec867d2716d543705ae9315e0a5cb264f7e
x86_64	kernel-rt-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm	4b3b0e5e5d8f83f898f8b27823e64ecdf2212c248d5f61ba853c8cb58f78e182
x86_64	kernel-rt-debug-modules-extra-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm	9cea3a45fdbf0528de9bdd704d5fcbbebc72994875b9dbdd667a42ceb83b8e7e
x86_64	kernel-rt-debug-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm	a04b6753ec401623c0b4d406c8b7fef348f07bf481c4195fd231c5e9aa10f50e
x86_64	kernel-rt-debug-devel-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm	b3bdf8b8e7868ac120c6a303db8c21c84f6cfd55b488b3a35833df92935e6b03
x86_64	kernel-rt-modules-extra-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm	ba868a7b40b1244fcbede39a4bb22d12b817b6d0ad0ec047311a86ee898f2b64
x86_64	kernel-rt-core-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm	ed9e2d91584b9ebe3ba5ef3ed1a84a3686009535638faf55b1bc86b7460e12b2

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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