CVE-2025-22041 ksmbd: fix use-after-free in ksmbd_sessions_deregister()
A use-after-free in the Linux kernel ksmbd module allows attackers to potentially execute code or escalate privileges via multichannel SMB sessions.
- 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-2025-22041?
CVE-2025-22041 is a high-severity use after free vulnerability in Linux kernel, published on 16 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_sessions_deregister()
In multichannel mode, UAF issue can occur in session_deregister when the second channel sets up a session through the connection of the first channel. session that is freed through the global session table can be accessed again through ->sessions of connection.
Weakness: CWE-416
Which versions are affected by CVE-2025-22041?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-22041?
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-2025-22041 being exploited?
There is no known exploitation of CVE-2025-22041 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-22041, DEBIAN-CVE-2025-22041, GHSA-gj89-4h85-hv53, ROOT-OS-UBUNTU-2204-CVE-2025-22041, ROOT-OS-UBUNTU-2404-CVE-2025-22041, UBUNTU-CVE-2025-22041.