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CVE-2025-21796VulnerabilityPublished Updated

linux, linux-aws, linux-aws-5.4, linux-bluefield, linux-gcp, linux-gcp-5.4, linux-hwe-5.4, linux-ibm, linux-ibm-5.4

Affects Linux kernelSource GCVE Database

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Not known to be exploited · fixed in 5.4.0-1151.161~18.04.1 : patch Linux kernel soon.

Data as of 31 Oct 2026, 01:29 UTC

Severity
High

Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Patch
Available – fixed in 5.4.0-1151.161~18.04.1, 5.4.0-1154.163~18.04.1, 5.4.0-222.242~18.04.1 +10

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 2 Oct 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 30 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
Ubuntu Pro 20.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=esm-infra/focalOther threatsAffected
  • <5.4.0-222.242
Fixed in
  • 5.4.0-222.242
Ubuntu Pro 20.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=esm-infra/focalOther threatsAffected
  • <5.4.0-1151.161
Fixed in
  • 5.4.0-1151.161
Ubuntu Pro 20.04 LTSlinux-bluefieldpkg:deb/ubuntu/linux-bluefield?arch=source&distro=esm-infra/focalOther threatsAffected
  • <5.4.0-1110.117
Fixed in
  • 5.4.0-1110.117
Ubuntu Pro 20.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=esm-infra/focalOther threatsAffected
  • <5.4.0-1154.163
Fixed in
  • 5.4.0-1154.163
Ubuntu Pro 20.04 LTSlinux-ibmpkg:deb/ubuntu/linux-ibm?arch=source&distro=esm-infra/focalOther threatsAffected
  • <5.4.0-1097.102
Fixed in
  • 5.4.0-1097.102
Ubuntu Pro 20.04 LTSlinux-iotpkg:deb/ubuntu/linux-iot?arch=source&distro=esm-infra/focalOther threatsAffected
  • <5.4.0-1055.58
Fixed in
  • 5.4.0-1055.58

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available and should be applied promptly. Ubuntu has released fixed kernel versions for all affected packages. After updating, a system reboot is required to activate the fixes. Due to an ABI change, recompilation and reinstallation of any third-party kernel modules are necessary. Users should follow the official Ubuntu security notice USN-7795-1 for detailed update instructions.

Description

Multiple security vulnerabilities were identified in the Linux kernel affecting various subsystems including Ext4 file system, NFS server daemon, packet sockets, network traffic control, and VMware vSockets driver. These flaws could potentially allow an attacker to compromise the system. Fixes have been released for affected Ubuntu kernel packages, and users are advised to update and reboot their systems. Due to ABI changes, recompilation of third-party kernel modules may be necessary after updating.

References

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