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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 an official security update for the kernel-rt packages in Red Hat Enterprise Linux 8.4 to fix this vulnerability. Users should apply the update as described in the Red Hat advisory (https://access.redhat.com/articles/11258) and reboot affected systems to ensure the patch is active. No additional mitigations are specified or required.

Description

A security vulnerability (CVE-2025-21785) affecting the kernel-rt packages in Red Hat Enterprise Linux 8.4 has been addressed. The flaw involves an out-of-bounds write to the cacheinfo array on arm64 architectures. This vulnerability has been rated as important by Red Hat Product Security. An update is available that fixes this issue, and a system reboot is required to apply the patch.

References

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