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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 should apply the provided kernel update for Red Hat Enterprise Linux 9 and reboot their systems to ensure the fix takes effect. Refer to Red Hat's official update instructions at https://access.redhat.com/articles/11258 for detailed guidance.

Description

A security vulnerability (CVE-2025-21785) affecting the Linux kernel's arm64 cacheinfo component allows an out-of-bounds write to the cacheinfo array. This flaw is addressed by a kernel update released by Red Hat for Red Hat Enterprise Linux 9 and related products. The update requires a system reboot to take effect. The vulnerability is rated as having an important security impact by Red Hat.

References

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