CVE-2026-73150
Description
A flaw was found in svxlink's LocationInfo/APRS functionality. The updateQsoStatus() function in AprsTcpClient.cpp formats a remote EchoLink station's callsign and info string into a fixed 80-byte stack buffer using sprintf without length checks. A remote attacker controlling an EchoLink station can supply a long callsign or info string to overflow the buffer, potentially enabling code execution.
Statement
svxlink is not shipped in any Red Hat Enterprise product. It is available in Fedora as a community-maintained package.
Mitigation
Update svxlink to version 26.05.1 or later.
Understanding the Weakness (CWE)
Availability
Technical Impact: Modify Memory; DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory)
Buffer overflows generally lead to crashes. Other attacks leading to lack of availability are possible, including putting the program into an infinite loop.
Integrity,Confidentiality,Availability,Access Control
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands; Bypass Protection Mechanism
Buffer overflows often can be used to execute arbitrary code, which is usually outside the scope of a program's implicit security policy.
Integrity,Confidentiality,Availability,Access Control,Other
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands; Bypass Protection Mechanism; Other
When the consequence is arbitrary code execution, this can often be used to subvert any other security service.
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