CVE-2026-49426: Incorrect audit records for ptrace(2) syscall requests

Vulnerability summary

CVE-2026-49426 is a low (CVSS 3.3) vulnerability in freebsd. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.2% of scored vulnerabilities.

Timeline

1. 19-08-2026
   PublishedVulnerability first disclosed.
2. 26-08-2026
   Last modifiedVulnerability information updated.

Description

When auditing a system call executed via ptrace(PT_SC_REMOTE), the kernel passed the return value of an internal setup function to AUDIT_SYSCALL_EXIT() rather than the actual result of the executed system call. As a result, committed audit records for system calls which returned an error do not reflect the true outcome of the operation. That is, they indicate that the operation succeeded when it in fact failed. Audit records for system calls executed via ptrace(PT_SC_REMOTE) may show an incorrect error status. An attacker with the ability to debug a process could use this to produce misleading audit trails, potentially undermining audit-based Intrusion Detection Systems (IDS).

• CWE-223Omission of Security-relevant InformationThe product does not record or display information that would be important for identifying the source or nature of an attack, or determining if an action is safe.
• CWE-224Obscured Security-relevant Information by Alternate NameThe product records security-relevant information according to an alternate name of the affected entity, instead of the canonical name.