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CVE-2026-23272VulnerabilityPublished Updated

linux, linux-aws, linux-aws-5.4, linux-aws-fips, linux-azure, linux-azure-5.4, linux-azure-fips, linux-bluefield

Affects Linux kernelSource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-23272· High 7.8

Not known to be exploited · CVSS 7.8 High · fixed in 5.4.0-1161.172~18.04.1 : patch Linux kernel soon.

Data as of 5 Nov 2026, 00:01 UTC

CVSS 3.1 base score
7.8High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (Linux)CVSS 3.17.8
EPSS
0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 5.4.0-1161.172~18.04.1, 5.4.0-1166.172~18.04.1, 5.4.0-1164.173~18.04.1 +14
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 20 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 4 Nov 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
  • <5.4.0-233.253
Fixed in
  • 5.4.0-233.253
Ubuntu Pro 20.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=esm-infra/focalOther threatsAffected
  • <5.4.0-1161.172
Fixed in
  • 5.4.0-1161.172
Ubuntu Pro 20.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=esm-infra/focalOther threatsAffected
  • <5.4.0-1166.172
Fixed in
  • 5.4.0-1166.172
Ubuntu Pro 20.04 LTSlinux-bluefieldpkg:deb/ubuntu/linux-bluefield?arch=source&distro=esm-infra/focalOther threatsAffected
  • <5.4.0-1120.127
Fixed in
  • 5.4.0-1120.127
Ubuntu Pro 20.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=esm-infra/focalOther threatsAffected
  • <5.4.0-1164.173
Fixed in
  • 5.4.0-1164.173
Ubuntu Pro 20.04 LTSlinux-iotpkg:deb/ubuntu/linux-iot?arch=source&distro=esm-infra/focalOther threatsAffected
  • <5.4.0-1065.68
Fixed in
  • 5.4.0-1065.68

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. Users should update their Linux kernel packages to the fixed versions listed in the vendor advisory (e.g., 5.4.0-1161.172~18.04.1 and later). After updating, a system reboot is required to apply the fixes. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be necessary. Follow the vendor's official update instructions and verify installation of the updated kernel packages.

Description

Multiple security vulnerabilities were discovered in the Linux kernel, including a logic flaw in the XFRM ESP-in-TCP subsystem known as Fragnesia. This flaw allows a local attacker to escalate privileges or potentially escape container isolation. The update addresses numerous other flaws across various kernel subsystems such as networking, storage, and tracing. These issues could be exploited to compromise affected systems. Fixes are available in updated Linux kernel packages for various distributions and cloud platforms.

References

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