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Ubuntu 20.04 LTS rsync Significant Denial Of Service Resolutions USN-8349-3

ubuntu
Calendar Grey June 16, 2026
Scroller Ubuntu Esm H88
Critical updates with fixes for rsync regressions in Ubuntu 20.04 to 14.04 LTS addressing security issues.
USN-8349-1 introduced regressions in rsync.

Summary

USN-8349-1 introduced regressions in rsync.

Software Description:

- rsync: fast, versatile, remote (and local) file-copying tool

Details:

USN-8349-1 fixed vulnerabilities in rsync. Unfortunately that update introduced multiple

regressions in rsync functionality. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Calum Hutton discovered that rsync contained a heap-based out-of-bounds

read when handling file transfers. A remote attacker with read access

to an rsync server could possibly use this issue to cause a denial of

service. (CVE-2025-10158)

Batuhan Sancak, Damien Neil, and Michael Stapelberg discovered that

rsync daemons configured without chroot protection were exposed to a

race condition on parent path components. A local attacker with write

access to a module could possibly use this issue to overwrite files,

obtain sensitive information, or escalate privileges.

(CVE-2026-29518)

It was discovered that rsync did no...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important rsync regression

Update Instructions

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

Ubuntu 20.04 LTS
  rsync                           3.1.3-8ubuntu0.9+esm2
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  rsync                           3.1.2-2.1ubuntu1.6+esm4
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  rsync                           3.1.1-3ubuntu1.3+esm6
                                  Available with Ubuntu Pro

Ubuntu 14.04 LTS
  rsync                           3.1.0-2ubuntu0.4+esm4
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.
After a standard system update you need to restart rsync daemons to make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8349-3

https://ubuntu.com/security/notices/USN-8349-2

https://ubuntu.com/security/notices/USN-8349-1

https://launchpad.net/bugs/2155874

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8349-3

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important rsync regression

Package Information

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