CVE-2026-49424 Kernel stack disclosure in Linux compatibility layer
An unprivileged user can read uninitialized kernel stack data via the Linux compatibility layer's waitid() implementation.
- 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-2026-49424?
CVE-2026-49424 is a medium-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
The Linux waitid() implementation translates a FreeBSD siginfo_t struct into a stack-declared Linux siginfo_t. It did not first zero the stack struct.
An unprivileged user may observe 104 bytes of uninitialized kernel stack data, which may contain sensitive information.
Weakness: CWE-908
Which versions are affected by CVE-2026-49424?
It affects 1 product.
Products include Freebsd Freebsd.
How do I fix CVE-2026-49424?
No fix has been published for CVE-2026-49424 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-49424 being exploited?
There is no known exploitation of CVE-2026-49424 in the wild and no public exploit code.
Other vulnerabilities in Freebsd Freebsd
Sources
Also known as GHSA-vv7x-5v76-w79j.