Red Hat Security Advisory: kpatch-patch-4_18_0-477_107_1, kpatch-patch-4_18_0-477_120_1, kpatch-patch-4_18_0-477_81_1
Affects Red HatSource GCVE Database
Not known to be exploited.
Data as of 5 Nov 2026, 19:19 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Exploitation evidence
Disclosed: evidence found.
CVE published 5 Mar 2026
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 5 Nov 2026.
What to do
AI-suggested
Apply the provided kpatch live patch modules for the affected kernel versions as detailed in the Red Hat advisory RHSA-2026:3865. After applying the update, a system reboot is required for the patch to take effect. This is the official fix provided by Red Hat.
Description
A vulnerability (CVE-2025-40248) in the Linux kernel's vsock component may lead to memory corruption. This issue affects Red Hat Enterprise Linux 8.8 kernels and is addressed by a kpatch live patch module. The patch requires a system reboot to take effect. The vulnerability has been rated as having an important security impact by Red Hat.