CVE-2023-52480 ksmbd: fix race condition between session lookup and expire
A race condition in the Linux kernel ksmbd module allows use-after-free, potentially leading to code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-52480?
CVE-2023-52480 is a critical vulnerability in Linux kernel, published on 29 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix race condition between session lookup and expire
Thread A + Thread B ksmbd_session_lookup | smb2_sess_setup sess = xa_load | | | xa_erase(&conn->sessions, sess->id); | | ksmbd_session_destroy(sess) --> kfree(sess) | // UAF! | sess->last_active = jiffies | +
This patch add rwsem to fix race condition between ksmbd_session_lookup and ksmbd_expire_session.
Weakness: CWE-362
Which versions are affected by CVE-2023-52480?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-52480?
Apply the vendor's patch.
Is CVE-2023-52480 being exploited?
There is no known exploitation of CVE-2023-52480 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2023-52480, DEBIAN-CVE-2023-52480, GHSA-v2j2-ph6r-wrg9, UBUNTU-CVE-2023-52480.