CVE-2023-53358 ksmbd: fix racy issue under cocurrent smb2 tree disconnect
A use-after-free vulnerability in the Linux kernel's ksmbd module allows attackers to execute arbitrary code or escalate privileges via concurrent SMB2 tree disconnects.
- 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-2023-53358?
CVE-2023-53358 is a high-severity use after free vulnerability in Linux kernel, published on 17 Sep 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 racy issue under cocurrent smb2 tree disconnect
There is UAF issue under cocurrent smb2 tree disconnect. This patch introduce TREE_CONN_EXPIRE flags for tcon to avoid cocurrent access.
Weakness: CWE-416
Which versions are affected by CVE-2023-53358?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-53358?
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-2023-53358 being exploited?
There is no known exploitation of CVE-2023-53358 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2023-53358, DEBIAN-CVE-2023-53358, GHSA-j8wr-29h3-4xqr, UBUNTU-CVE-2023-53358.