Red Hat Security Advisory: kernel security update
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 29 Oct 2026, 10:36 UTC
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
Disclosed: evidence found.
CVE published 26 Mar 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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 updated kernel package that addresses this vulnerability. Users should apply the kernel update as described in the Red Hat advisory (RHSA-2025:3213) and reboot their systems to ensure the fix takes effect. No additional mitigation steps are required beyond applying the official update and rebooting.
Description
A security vulnerability (CVE-2025-21785) exists in the Linux kernel's arm64 cacheinfo component that could lead to an out-of-bounds write to the cacheinfo array. This flaw affects Red Hat Enterprise Linux 8.6 and related variants. Red Hat has issued a security advisory and released an updated kernel package to address this issue. The update requires a system reboot to take effect. The vulnerability is rated as important by Red Hat Product Security, with a high severity classification in this report. No public exploit or in-the-wild exploitation has been reported. Users should apply the provided kernel update to mitigate the risk.