Red Hat Security Advisory: kernel-rt security update
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 30 Oct 2026, 11:52 UTC
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
Disclosed: evidence found.
CVE published 8 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 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.