What is RHSA-2025:21397?

RHSA-2025:21397 is a security advisory published by Red Hat Product Security with Medium severity. Red Hat Security Advisory: kernel-rt security update

Which CVE IDs does RHSA-2025:21397 cover?

RHSA-2025:21397 covers the following CVE IDs: CVE-2025-39718. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of RHSA-2025:21397?

RHSA-2025:21397 has a CVSS v3 base score of 7.6, published by Red Hat Product Security.

Which products are affected by RHSA-2025:21397?

RHSA-2025:21397 affects 32 products, including: Red Hat Enterprise Linux NFV (v. 8); Red Hat Enterprise Linux RT (v. 8); kernel-rt-0:4.18.0-553.84.1.rt7.425.el8_10.src as a component of Red Hat Enterprise Linux NFV (v. 8); kernel-rt-0:4.18.0-553.84.1.rt7.425.el8_10.src as a component of Red Hat Enterprise Linux RT (v. 8); kernel-rt-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8); and others — see the full list on the advisory page.

RHSA-2025:21397MediumCVSS 7.6

Red Hat Security Advisory: kernel-rt security update

Vendor

Red Hat Product Security

Published

November 17, 2025

Last Modified

July 30, 2026

🔗 CVE IDs covered (1)

CVE-2025-39718 →

📋 Description

CVE-2025-39718 — kernel: vsock/virtio: Validate length in packet header before skb_put()

🎯 Affected products32

Red Hat Enterprise Linux NFV (v. 8)
Red Hat Enterprise Linux RT (v. 8)
kernel-rt-0:4.18.0-553.84.1.rt7.425.el8_10.src as a component of Red Hat Enterprise Linux NFV (v. 8)
kernel-rt-0:4.18.0-553.84.1.rt7.425.el8_10.src as a component of Red Hat Enterprise Linux RT (v. 8)
kernel-rt-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
kernel-rt-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
kernel-rt-core-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
kernel-rt-core-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
kernel-rt-debug-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
kernel-rt-debug-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
kernel-rt-debug-core-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
kernel-rt-debug-core-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
kernel-rt-debug-debuginfo-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
kernel-rt-debug-debuginfo-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
kernel-rt-debug-devel-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
kernel-rt-debug-devel-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
kernel-rt-debug-kvm-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
kernel-rt-debug-modules-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
kernel-rt-debug-modules-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
kernel-rt-debug-modules-extra-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
kernel-rt-debug-modules-extra-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
kernel-rt-debuginfo-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
kernel-rt-debuginfo-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
kernel-rt-debuginfo-common-x86_64-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
kernel-rt-debuginfo-common-x86_64-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
kernel-rt-devel-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
kernel-rt-devel-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
kernel-rt-kvm-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
kernel-rt-modules-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux NFV (v. 8)
kernel-rt-modules-0:4.18.0-553.84.1.rt7.425.el8_10.x86_64 as a component of Red Hat Enterprise Linux RT (v. 8)
+2 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Workaround: To mitigate this issue, prevent module vmw_vsock_virtio_transport from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.

🔗 CVE IDs covered (1)

📋 Description

🎯 Affected products32

✅ Remediation

🔗 References (4)