CVE-2024-35869 smb: client: guarantee refcounted children from parent session
A use-after-free vulnerability in the Linux kernel SMB client allows attackers to potentially execute code or cause a denial of service via DFS referrals.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-35869?
CVE-2024-35869 is a critical use after free vulnerability in Linux kernel, published on 19 May 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:
smb: client: guarantee refcounted children from parent session
Avoid potential use-after-free bugs when walking DFS referrals, mounting and performing DFS failover by ensuring that all children from parent @tcon->ses are also refcounted. They're all needed across the entire DFS mount. Get rid of @tcon->dfs_ses_list while we're at it, too.
Weakness: CWE-416
Which versions are affected by CVE-2024-35869?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-35869?
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-2024-35869 being exploited?
There is no known exploitation of CVE-2024-35869 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-35869, DEBIAN-CVE-2024-35869, GHSA-g2cf-q8fg-whrr, ROOT-OS-DEBIAN-11-CVE-2024-35869, ROOT-OS-DEBIAN-12-CVE-2024-35869, ROOT-OS-UBUNTU-2204-CVE-2024-35869 and 1 more.