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CVE-2025-21785VulnerabilityPublished 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 29 Oct 2026, 10:36 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 19% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 26 Mar 2025

  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 29 Oct 2026.

What to do

AI-suggested

Red Hat has released updated kernel-rt packages for Red Hat Enterprise Linux 9.2 Extended Update Support that fix this vulnerability. Users should apply the security update as detailed in the Red Hat advisory (https://access.redhat.com/articles/11258) and reboot the system for the update to take effect. This is the official and recommended remediation.

Description

A security vulnerability (CVE-2025-21785) affecting the kernel-rt packages in Red Hat Enterprise Linux 9.2 Extended Update Support has been identified. The flaw involves an out-of-bounds write to the cacheinfo array on arm64 architectures. Red Hat has issued an important security advisory and released updated kernel-rt packages to address this issue. Systems must be rebooted after applying the update for the fix to take effect.

References

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