CVE-2026-49430 Kernel heap overflow in ZFS_IOC_RECV_NEW ioctl
A local attacker with ZFS receive permissions can trigger kernel memory corruption via integer truncation in the ZFS_IOC_RECV_NEW ioctl, potentially leading to code execution.
- 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-2026-49430?
CVE-2026-49430 is a high-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 ZFS_IOC_RECV_NEW ioctl, in the heal receive path, similarly truncated a 64-bit payload size to a 32-bit integer for allocation, then used the original 64-bit size as the length for a byteswap operation.
A local user with the "receive" delegated ZFS permission can trigger kernel memory corruption via ZFS_IOC_RECV_NEW by sending a crafted receive stream in heal mode.
Weakness: CWE-122
Which versions are affected by CVE-2026-49430?
It affects 1 product.
Products include Freebsd Freebsd.
How do I fix CVE-2026-49430?
No fix has been published for CVE-2026-49430 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-49430 being exploited?
There is no known exploitation of CVE-2026-49430 in the wild and no public exploit code.
Other vulnerabilities in Freebsd Freebsd
Sources
Also known as GHSA-gx22-rr34-hq5j.