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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 affected Red Hat Enterprise Linux 8.8 Extended Update Support and Extended Life Cycle Long Life versions should apply the kernel update as detailed in the Red Hat advisory (RHSA-2025:3216) and reboot their systems to ensure the fix takes effect.

Description

A security vulnerability (CVE-2025-21785) in the Linux kernel's arm64 cacheinfo component could lead to an out-of-bounds write to the cacheinfo array. This flaw affects Red Hat Enterprise Linux 8.8 Extended Update Support and Extended Life Cycle Long Life versions on multiple architectures including x86_64, aarch64, ppc64le, and s390x. Red Hat has issued a security advisory and released updated kernel packages to address this issue. A system reboot is required after applying the update for the fix to take effect.

References

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