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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 an official security update that fixes this vulnerability. Users should apply the kernel update provided in Red Hat Enterprise Linux 9.2 Extended Update Support and reboot their systems to ensure the fix takes effect. Refer to Red Hat's official update documentation at https://access.redhat.com/articles/11258 for detailed instructions.

Description

A security vulnerability identified as CVE-2025-21785 affects the Linux kernel packages in Red Hat Enterprise Linux 9.2 Extended Update Support. The flaw involves an out-of-bounds write to the cacheinfo array on the arm64 architecture. Red Hat has issued a security advisory and released an update to address 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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