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CVE-2025-40248VulnerabilityPublished Updated

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

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Not known to be exploited.

Data as of 5 Nov 2026, 19:19 UTC

Severity
High

Rated by Threat Radar · No CVSS score from NVD or the CNA

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 5 Mar 2026

  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 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.

References

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