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[USN-9008-1] libnfs vulnerability

Posted on 09 November 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-9008-1
November 09, 2026

libnfs vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.10
- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

libnfs could be made to crash or run programs if it received
specially crafted network traffic.

Software Description:
- libnfs: NFS client library

Details:

It was discovered that libnfs did not properly enforce the maximum
size bound during ZDR decoding, resulting in an out-of-bounds write.
An attacker could possibly use this issue to cause libnfs to crash,
resulting in a denial of service, or execute arbitrary code.

Update instructions:

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

Ubuntu 26.10
libnfs14 5.0.2-1ubuntu3.1

Ubuntu 26.04 LTS
libnfs14 5.0.2-1ubuntu1.2

Ubuntu 24.04 LTS
libnfs14 5.0.2-1ubuntu0.24.04.2

Ubuntu 22.04 LTS
libnfs13 4.0.0-1ubuntu0.2

In general, a standard system update will make all the necessary
changes.

References:
https://ubuntu.com/security/notices/USN-9008-1
CVE-2026-108985

Package Information:
https://launchpad.net/ubuntu/+source/libnfs/5.0.2-1ubuntu3.1
https://launchpad.net/ubuntu/+source/libnfs/5.0.2-1ubuntu1.2
https://launchpad.net/ubuntu/+source/libnfs/5.0.2-1ubuntu0.24.04.2
https://launchpad.net/ubuntu/+source/libnfs/4.0.0-1ubuntu0.2

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