CVE-2025-21967 ksmbd: fix use-after-free in ksmbd_free_work_struct
A use-after-free vulnerability in the Linux kernel's ksmbd module allows attackers to potentially execute arbitrary code or escalate privileges.
- 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-2025-21967?
CVE-2025-21967 is a high-severity use after free vulnerability in Linux kernel, published on 1 Apr 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 use-after-free in ksmbd_free_work_struct
->interim_entry of ksmbd_work could be deleted after oplock is freed. We don't need to manage it with linked list. The interim request could be immediately sent whenever a oplock break wait is needed.
Weakness: CWE-416
Which versions are affected by CVE-2025-21967?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-21967?
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-2025-21967 being exploited?
There is no known exploitation of CVE-2025-21967 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-21967, DEBIAN-CVE-2025-21967, GHSA-p3jf-39f4-gqr8, ROOT-OS-DEBIAN-12-CVE-2025-21967, ROOT-OS-UBUNTU-2204-CVE-2025-21967, ROOT-OS-UBUNTU-2404-CVE-2025-21967 and 1 more.