CVE-2026-49413 Flaw in Linuxulator execution of setugid binaries
An unprivileged local user can gain elevated privileges by injecting a shared library into set-user-ID Linux binaries via the Linuxulator.
- 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-2026-49413?
CVE-2026-49413 is a high-severity vulnerability in Freebsd Freebsd, published on 27 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The Linuxulator determined whether a binary was set-user-ID or set-group-ID by checking the P_SUGID process flag. During execve(2), this flag is not yet set at the point where the auxiliary vector is constructed, so AT_SECURE was incorrectly set to zero for set-user-ID and set-group-ID executables.
An unprivileged local user can inject a shared library via LD_PRELOAD into a set-user-ID or set-group-ID Linux binary, gaining the privileges of that binary.
Weakness: CWE-266
Which versions are affected by CVE-2026-49413?
It affects 1 product.
Products include Freebsd Freebsd.
How do I fix CVE-2026-49413?
No fix has been published for CVE-2026-49413 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-49413 being exploited?
There is no known exploitation of CVE-2026-49413 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.