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CVE-2025-40026VulnerabilityPublished Updated

Red Hat Security Advisory: kernel-rt security update

Affects Linux kernelSource GCVE Database

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Not known to be exploited.

Data as of 30 Oct 2026, 11:52 UTC

Severity
Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS
0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 8 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 30 Oct 2026.

What to do

AI-suggested

A security update is available for Red Hat Enterprise Linux 7 Extended Lifecycle Support kernel-rt packages. Users should apply the update as detailed in Red Hat's advisory and reboot the system to ensure the fix takes effect. Red Hat recommends treating all kernel errata as security-relevant and advises against delaying updates.

Description

A security update for the kernel-rt package in Red Hat Enterprise Linux 7 Extended Lifecycle Support addresses a vulnerability identified as CVE-2025-40026. The issue involves the KVM component on x86 architectures, specifically related to the handling of L1 intercepts during userspace I/O completion. This update is rated as having a moderate security impact. Systems must be rebooted after applying the update for it to take effect.

References

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