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CVE-2025-21785VulnerabilityPublished Updated

Red Hat Security Advisory: kernel 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 packages that fix this vulnerability. Users of Red Hat Enterprise Linux 8.4 and related variants should apply the kernel update as provided in Red Hat Advisory RHSA-2025:3207. A system reboot is required for the update to take effect. Following the vendor's instructions for applying the update is the recommended mitigation.

Description

A security vulnerability (CVE-2025-21785) affecting the Linux kernel on arm64 architecture has been identified and addressed by Red Hat. The flaw involves an out-of-bounds write to the cacheinfo array in the kernel's arm64 cacheinfo component. Red Hat has released a security update for Red Hat Enterprise Linux 8.4 to fix this issue. The update requires a system reboot to take effect. The vulnerability is rated as having an Important security impact by Red Hat Product Security.

References

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