CVE-2025-38437 ksmbd: fix potential use-after-free in oplock/lease break ack
A use-after-free vulnerability in the Linux kernel's ksmbd module allows attackers to potentially execute code or escalate privileges via crafted oplock/lease break acknowledgments.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-38437?
CVE-2025-38437 is a high-severity use after free vulnerability in Debian Debian Linux, published on 25 Jul 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix potential use-after-free in oplock/lease break ack
If ksmbd_iov_pin_rsp return error, use-after-free can happen by accessing opinfo->state and opinfo_put and ksmbd_fd_put could called twice.
Weakness: CWE-416
Which versions are affected by CVE-2025-38437?
It affects 2 products.
Products include Debian Debian Linux, Linux kernel.
How do I fix CVE-2025-38437?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2025-38437 being exploited?
There is no known exploitation of CVE-2025-38437 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as AZL-65702, BELL-CVE-2025-38437, DEBIAN-CVE-2025-38437, GHSA-c6c4-gfjc-9wrj, ROOT-OS-DEBIAN-12-CVE-2025-38437, ROOT-OS-UBUNTU-2204-CVE-2025-38437 and 2 more.