CVE-2026-49415 Local privilege escalation via execve(2) TOCTOU race
An unprivileged local user can exploit a race condition in execve to modify SUID binary memory and gain root privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-49415?
CVE-2026-49415 is a high-severity vulnerability in Freebsd Freebsd, published on 19 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
During execve(2) of a SUID binary, the new virtual address space is installed before the process credentials are updated. During this window, a process running as the same user can access the target process's memory via procfs or linprocfs, because the kernel's debugging permission check still saw the original credentials.
An unprivileged local user can exploit this race to modify the address space of a SUID binary before its credentials are elevated, potentially gaining full control of the affected system.
Weakness: CWE-367
Which versions are affected by CVE-2026-49415?
It affects 1 product.
Products include Freebsd Freebsd.
How do I fix CVE-2026-49415?
No fix has been published for CVE-2026-49415 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-49415 being exploited?
There is no known exploitation of CVE-2026-49415 in the wild and no public exploit code.
Other vulnerabilities in Freebsd Freebsd
Sources
Also known as GHSA-c9vm-fv4g-fr7v.