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CVE-2025-39718VulnerabilityPublished Updated

Red Hat Security Advisory: kernel-rt security update

Affects Linux kernelSource GCVE Database

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Not known to be exploited.

Data as of 5 Nov 2026, 19:32 UTC

Severity
Medium

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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 17 Nov 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 5 Nov 2026.

What to do

AI-suggested

Red Hat has released updated kernel-rt packages that fix this vulnerability. Users of affected Red Hat Enterprise Linux 8 Real Time variants should apply the security update as detailed in Red Hat advisory RHSA-2025:21397 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 update for the Red Hat Real Time Linux Kernel (kernel-rt) addresses a vulnerability identified as CVE-2025-39718. The flaw involves improper validation of the length in the packet header before the skb_put() function call in the vsock/virtio kernel component. This issue could potentially lead to memory corruption or related impacts. Red Hat has rated this vulnerability as having moderate severity and has released updated kernel-rt packages for Red Hat Enterprise Linux 8 Real Time variants. A system reboot is required to apply the update.

References

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