CVE-2026-49426 Incorrect audit records for ptrace(2) syscall requests
Attackers can generate misleading audit records for ptrace syscalls, undermining audit-based intrusion detection systems on FreeBSD.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-49426?
CVE-2026-49426 is a low-severity vulnerability in Freebsd Freebsd, published on 19 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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).
Which versions are affected by CVE-2026-49426?
It affects 1 product.
Products include Freebsd Freebsd.
How do I fix CVE-2026-49426?
No fix has been published for CVE-2026-49426 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-49426 being exploited?
There is no known exploitation of CVE-2026-49426 in the wild and no public exploit code.