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Ubuntu 25.10 kmod Critical Algif_aead Privilege Escalation USN-8226-1

ubuntu
Calendar Grey April 30, 2026
Dist Ubuntu Esm H88
kmod update secures Ubuntu against algif_aead privilege escalation issue with critical importance for system integrity.
kmod has been updated to block loading of the algif_aead kernel module.

Summary

kmod has been updated to block loading of the algif_aead kernel module.

Software Description:

- kmod: tools for managing Linux kernel modules

Details:

It was discovered that the Linux kernel algif_aead module contained a logic

flaw allowing a local attacker to escalate privileges to root. This update

to the kmod package disables loading the algif_aead module as a measure to

mitigate the issue until kernel updates are made available.

See the following URL for more information

https://ubuntu.com/blog/copy-fail-vulnerability-fixes-available

Topics%20covered

Topics Covered

security advisory critical privilege escalation Ubuntu kernel module kmod

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.10
  kmod                            34.2-2ubuntu1.1

Ubuntu 24.04 LTS
  kmod                            31+20240202-2ubuntu7.2

Ubuntu 22.04 LTS
  kmod                            29-1ubuntu1.1

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8226-1

CVE-2026-31431, https://launchpad.net/bugs/2150743

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8226-1

Topics%20covered

Topics Covered

security advisory critical privilege escalation Ubuntu kernel module kmod

Package Information

https://launchpad.net/ubuntu/+source/kmod/34.2-2ubuntu1.1
https://launchpad.net/ubuntu/+source/kmod/31+20240202-2ubuntu7.2
https://launchpad.net/ubuntu/+source/kmod/29-1ubuntu1.1

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