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QSN-8786-1: rsyslog vulnerability
September 21, 2026
Summary
rsyslog could be made to crash if it received specially crafted network traffic.
Details
It was discovered that rsyslog incorrectly calculated buffer sizes when replacing strings. A remote attacker could possibly use this issue to cause rsyslog to crash, resulting in a denial of service.
Affected QuantaStor releases
| Release | Platform | Package | Exposure | Shipped version | Fixed version | Status |
|---|---|---|---|---|---|---|
| 6.9.1.001 | Ubuntu 22.04 LTS | rsyslog | Internally-facing | 8.2112.0-2ubuntu2.2 | 8.2112.0-2ubuntu2.5 | Fixed by QuantaStor security update |
| 6.9.0.464 | Ubuntu 22.04 LTS | rsyslog | Internally-facing | 8.2112.0-2ubuntu2.2 | 8.2112.0-2ubuntu2.5 | Fixed by QuantaStor security update |
| 6.8.6.015 | Ubuntu 22.04 LTS | rsyslog | Internally-facing | 8.2112.0-2ubuntu2.2 | 8.2112.0-2ubuntu2.5 | Fixed by QuantaStor security update |
| 6.8.5.018 | Ubuntu 22.04 LTS | rsyslog | Internally-facing | 8.2112.0-2ubuntu2.2 | 8.2112.0-2ubuntu2.5 | Fixed by QuantaStor security update |
| 6.8.4.038 | Ubuntu 22.04 LTS | rsyslog | Internally-facing | 8.2112.0-2ubuntu2.2 | 8.2112.0-2ubuntu2.5 | Fixed by QuantaStor security update |
| 6.8.3.018 | Ubuntu 22.04 LTS | rsyslog | Internally-facing | 8.2112.0-2ubuntu2.2 | 8.2112.0-2ubuntu2.5 | Fixed by QuantaStor security update |
| 6.8.2.002 | Ubuntu 22.04 LTS | rsyslog | Internally-facing | 8.2112.0-2ubuntu2.2 | 8.2112.0-2ubuntu2.5 | Fixed by QuantaStor security update |
| 6.8.1.007 | Ubuntu 22.04 LTS | rsyslog | Internally-facing | 8.2112.0-2ubuntu2.2 | 8.2112.0-2ubuntu2.5 | Fixed by QuantaStor security update |
| 6.8.0.205 | Ubuntu 22.04 LTS | rsyslog | Internally-facing | 8.2112.0-2ubuntu2.2 | 8.2112.0-2ubuntu2.5 | Fixed by QuantaStor security update |
Internally-facing: only accessible when logged into the QuantaStor console/ssh as the qadmin administrative sudo user; generally lower priority. Externally-facing: part of a service the storage platform presents on the network (or the kernel), so potentially reachable over the network.
CVEs
References
https://ubuntu.com/security/notices/USN-8786-1
https://nvd.nist.gov/vuln/detail/CVE-2026-78002
Update
Fixes marked Fixed by QuantaStor security update are applied by upgrading QuantaStor with security patches included (Upgrade Manager). Fixed package versions:
| Platform | Package | Version |
|---|---|---|
| bionic | rsyslog | 8.32.0-1ubuntu4.2+esm1 |
| Ubuntu 20.04 LTS | rsyslog | 8.2001.0-1ubuntu1.3+esm1 |
| Ubuntu 22.04 LTS | rsyslog | 8.2112.0-2ubuntu2.5 |
| Ubuntu 24.04 LTS | rsyslog | 8.2312.0-3ubuntu9.4 |
| resolute | rsyslog | 8.2512.0-1ubuntu4.2 |
| xenial | rsyslog | 8.16.0-1ubuntu3.1+esm3 |