[USN-8598-1] rsyslog vulnerabilities

[noreply+usn-bot at canonical.com]

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Ubuntu Security Notice USN-8598-1
July 23, 2026

rsyslog vulnerabilities
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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 rsyslog.

Software Description:
- rsyslog: Enhanced syslogd

Details:

It was discovered that rsyslog incorrectly handled regex-based TCP framing
in the imptcp module. A remote attacker could possibly use this issue to
cause rsyslog to crash, resulting in a denial of service.

It was discovered that rsyslog incorrectly handled oversized RFC5424
structured data in the mmpstrucdata module. A remote attacker could
possibly use this issue to cause rsyslog to crash, resulting in a denial of
service. (CVE-2026-61548)

Update instructions:

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

Ubuntu 26.04 LTS
  rsyslog                         8.2512.0-1ubuntu4.1

Ubuntu 24.04 LTS
  rsyslog                         8.2312.0-3ubuntu9.3

Ubuntu 22.04 LTS
  rsyslog                         8.2112.0-2ubuntu2.4

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

References:
  https://ubuntu.com/security/notices/USN-8598-1
  CVE-2026-61548

Package Information:
  https://launchpad.net/ubuntu/+source/rsyslog/8.2512.0-1ubuntu4.1
  https://launchpad.net/ubuntu/+source/rsyslog/8.2312.0-3ubuntu9.3
  https://launchpad.net/ubuntu/+source/rsyslog/8.2112.0-2ubuntu2.4
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