FreeBSD Kernel: Audit Records May Misreport Syscall via ptrace(PT_SC_REMOTE)
CVE-2026-49426 Published on August 19, 2026
Incorrect audit records for ptrace(2) syscall requests
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).
Weakness Types
Omission of Security-relevant Information
The application 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.
Obscured Security-relevant Information by Alternate Name
The software records security-relevant information according to an alternate name of the affected entity, instead of the canonical name.
Products Associated with CVE-2026-49426
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Affected Versions
FreeBSD:- Version 15.1-RELEASE and below p1 is affected.
- Version 15.0-RELEASE and below p11 is affected.
- Version 14.4-RELEASE and below p7 is affected.
- Version 14.3-RELEASE and below p16 is affected.