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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 for the kernel packages that addresses this vulnerability. Users should apply the update as described in the Red Hat advisory and reboot their systems to ensure the fix takes effect. No additional mitigation steps are indicated by the vendor.

Description

A security update has been issued for the Linux kernel packages in Red Hat Enterprise Linux 8 to address a vulnerability identified as CVE-2025-21785. The flaw involves an out-of-bounds write to the cacheinfo array in the arm64 architecture kernel code. This vulnerability is rated as important by Red Hat Product Security. The update requires a system reboot to take effect.

References

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