Red Hat Security Advisory: kernel-rt 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 updated kernel-rt packages for Red Hat Enterprise Linux 9.2 Extended Update Support that fix this vulnerability. Users should apply the security update as detailed in the Red Hat advisory (https://access.redhat.com/articles/11258) and reboot the system for the update to take effect. This is the official and recommended remediation.
Description
A security vulnerability (CVE-2025-21785) affecting the kernel-rt packages in Red Hat Enterprise Linux 9.2 Extended Update Support has been identified. The flaw involves an out-of-bounds write to the cacheinfo array on arm64 architectures. Red Hat has issued an important security advisory and released updated kernel-rt packages to address this issue. Systems must be rebooted after applying the update for the fix to take effect.