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[USN-8697-1] GNU Core Utilities vulnerabilities

Posted on 31 August 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8697-1
August 31, 2026

coreutils vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

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

Summary:

Several security issues were fixed in GNU Core Utilities.

Software Description:
- coreutils: GNU core utilities

Details:

It was discovered that GNU Core Utilities sort had a heap buffer under-read
in its begfield() function. A local attacker could possibly use this issue
to cause GNU Core Utilities to crash, resulting in a denial of service, or
obtain sensitive information. (CVE-2025-5278)

It was discovered that GNU Core Utilities uniq had an out-of-bounds read
when the -w option was used with crafted multibyte input. A local attacker
could possibly use this issue to cause GNU Core Utilities to crash,
resulting in a denial of service, or obtain sensitive information. This
issue only affected Ubuntu 26.04 LTS. (CVE-2026-56391)

Update instructions:

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

Ubuntu 26.04 LTS
gnu-coreutils 9.7-3ubuntu2.1

Ubuntu 24.04 LTS
coreutils 9.4-3ubuntu6.3

Ubuntu 22.04 LTS
coreutils 8.32-4.1ubuntu1.4

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

References:
https://ubuntu.com/security/notices/USN-8697-1
CVE-2025-5278, CVE-2026-56391

Package Information:
https://launchpad.net/ubuntu/+source/coreutils/9.7-3ubuntu2.1
https://launchpad.net/ubuntu/+source/coreutils/9.4-3ubuntu6.3
https://launchpad.net/ubuntu/+source/coreutils/8.32-4.1ubuntu1.4

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