RHSA-2026:55765

Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update

Published Aug 18, 2026 · corrected/updated Oct 15, 2026 · evidence confidence medium

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

RHSA-2026:55765 is a high public vulnerability record for this product. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether this product is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: kernel-rt (0 → 0:4.18.0-553.156.1.rt7.497.el8_10); kernel-rt-core (0 → 0:4.18.0-553.156.1.rt7.497.el8_10); kernel-rt-debug (0 → 0:4.18.0-553.156.1.rt7.497.el8_10); kernel-rt-debug-core (0 → 0:4.18.0-553.156.1.rt7.497.el8_10). Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: CVSS 8.7. It is not currently listed in the CISA Known Exploited catalog. Sources contributing to this record: osv. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

Exploitation evidence
Not listed as known exploited in CISA KEV. Not in the CISA KEV catalog.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

Aug 18, 2026 · OSV.dev
Detected
Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update
Oct 15, 2026 · OSV.dev
Fix available
kernel-rt fixed in 0:4.18.0-553.156.1.rt7.497.el8_10; kernel-rt-core fixed in 0:4.18.0-553.156.1.rt7.497.el8_10; kernel-rt-debug fixed in 0:4.18.0-553.156.1.rt7.497.el8_10; kernel-rt-debug-core fixed in 0:4.18.0-553.156.1.rt7.497.el8_10
Oct 15, 2026 · OSV.dev
Fix available
kernel-rt fixed in 0:4.18.0-553.156.1.rt7.497.el8_10
Oct 15, 2026 · OSV.dev
Fix available
kernel-rt-core fixed in 0:4.18.0-553.156.1.rt7.497.el8_10
Oct 15, 2026 · OSV.dev
Fix available
kernel-rt-debug fixed in 0:4.18.0-553.156.1.rt7.497.el8_10
Oct 15, 2026 · OSV.dev
Fix available
kernel-rt-debug-core fixed in 0:4.18.0-553.156.1.rt7.497.el8_10
Oct 15, 2026 · OSV.dev
Fix available
kernel-rt-debug-debuginfo fixed in 0:4.18.0-553.156.1.rt7.497.el8_10
Oct 15, 2026 · OSV.dev
Fix available
kernel-rt-debug-devel fixed in 0:4.18.0-553.156.1.rt7.497.el8_10
Oct 15, 2026 · OSV.dev
Fix available
kernel-rt-debug-kvm fixed in 0:4.18.0-553.156.1.rt7.497.el8_10
Oct 15, 2026 · OSV.dev
Fix available
kernel-rt-debug-modules fixed in 0:4.18.0-553.156.1.rt7.497.el8_10
Oct 15, 2026 · OSV.dev
Fix available
kernel-rt-debug-modules-extra fixed in 0:4.18.0-553.156.1.rt7.497.el8_10
Oct 15, 2026 · OSV.dev
Fix available
kernel-rt-debuginfo fixed in 0:4.18.0-553.156.1.rt7.497.el8_10
Oct 15, 2026 · OSV.dev
Fix available
kernel-rt-debuginfo-common-x86_64 fixed in 0:4.18.0-553.156.1.rt7.497.el8_10
Oct 15, 2026 · OSV.dev
Fix available
kernel-rt-devel fixed in 0:4.18.0-553.156.1.rt7.497.el8_10
Oct 15, 2026 · OSV.dev
Updated
Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update

Affected

Red Hat:enterprise_linux:8::nfv kernel-rt0 → 0:4.18.0-553.156.1.rt7.497.el8_10
Red Hat:enterprise_linux:8::nfv kernel-rt-core0 → 0:4.18.0-553.156.1.rt7.497.el8_10
Red Hat:enterprise_linux:8::nfv kernel-rt-debug0 → 0:4.18.0-553.156.1.rt7.497.el8_10
Red Hat:enterprise_linux:8::nfv kernel-rt-debug-core0 → 0:4.18.0-553.156.1.rt7.497.el8_10
Red Hat:enterprise_linux:8::nfv kernel-rt-debug-debuginfo0 → 0:4.18.0-553.156.1.rt7.497.el8_10
Red Hat:enterprise_linux:8::nfv kernel-rt-debug-devel0 → 0:4.18.0-553.156.1.rt7.497.el8_10
Red Hat:enterprise_linux:8::nfv kernel-rt-debug-kvm0 → 0:4.18.0-553.156.1.rt7.497.el8_10
Red Hat:enterprise_linux:8::nfv kernel-rt-debug-modules0 → 0:4.18.0-553.156.1.rt7.497.el8_10
Red Hat:enterprise_linux:8::nfv kernel-rt-debug-modules-extra0 → 0:4.18.0-553.156.1.rt7.497.el8_10
Red Hat:enterprise_linux:8::nfv kernel-rt-debuginfo0 → 0:4.18.0-553.156.1.rt7.497.el8_10
Red Hat:enterprise_linux:8::nfv kernel-rt-debuginfo-common-x86_640 → 0:4.18.0-553.156.1.rt7.497.el8_10
Red Hat:enterprise_linux:8::nfv kernel-rt-devel0 → 0:4.18.0-553.156.1.rt7.497.el8_10

Sources

OSV.devPackage advisoryRHSA-2026:55765
Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update
osv.dev