CVE-2024-47745VulnerabilityPublished 15 May 2025Updated 27 Jun 2026

Red Hat Security Advisory: kernel-rt security update

Affects Red HatSource GCVE Database

Mentioned vulnerabilities

CVE-2025-21756

Not known to be exploited.

Data as of 25 Oct 2026, 19:02 UTC

Severity

High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.2% chance of exploitation in 30 days – higher than 20% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

Disclosed: evidence found.
CVE published 15 May 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Red Hatredhat/kernel-rt`pkg:rpm/redhat/kernel-rt`Other threats	Affected =9.2	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Red Hat has released updated kernel-rt packages for Red Hat Enterprise Linux 9.2 Extended Update Support and Extended Life Cycle that address these vulnerabilities. Users should apply the security update as detailed in the Red Hat advisory RHSA-2025:7676 and reboot affected systems to ensure the fixes take effect. For detailed update instructions, refer to https://access.redhat.com/articles/11258. No additional mitigation steps are indicated beyond applying the official patches and rebooting.

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: mm: call the security_mmap_file() LSM hook in remap_file_pages() (CVE-2024-47745) * kernel: vsock: Keep the binding until socket destruction (CVE-2025-21756) 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.

Impact

The vulnerabilities affect the kernel-rt packages used in Red Hat Enterprise Linux 9.2 for real-time kernel operations. The first vulnerability (CVE-2024-47745) relates to a missing security hook call in memory remapping, which could potentially allow security policy bypass or improper memory access control. The second vulnerability (CVE-2025-21756) involves improper handling of vsock socket bindings, which could lead to resource management issues. Red Hat rates these issues as having an important security impact, indicating a significant but not critical risk. No known exploits in the wild have been reported at this time.

Summary

This advisory covers security fixes for the kernel-rt packages in Red Hat Enterprise Linux 9.2. The first fix (CVE-2024-47745) ensures that the security_mmap_file() Linux Security Module hook is called during remap_file_pages() operations in the kernel memory management subsystem, addressing a potential security oversight. The second fix (CVE-2025-21756) corrects the vsock implementation to maintain socket binding until socket destruction, preventing premature release of resources. Both vulnerabilities are rated as important by Red Hat Product Security. The advisory references updated kernel-rt packages that include these fixes and requires a system reboot to activate the patches.

CWE-670Always-Incorrect Control Flow Implementation (opens in a new tab)
Class weakness
The code contains a control flow path that does not reflect the algorithm that the path is intended to implement, leading to incorrect behavior any time this path is navigated.
CWE-416Use After Free (opens in a new tab)
Variant weaknessLikelihood of exploit: HighCWE Top 25 (2025): #7
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
Architecture and Design · Language Selection
Choose a language that provides automatic memory management.
Implementation · Attack Surface Reduction
When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 25 Jun 2026, 22:10 UTC

WeaknessesCWE-670, CWE-416

Technical details

References

Community reviews

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