CVE-2024-27069 ovl: relax WARN_ON in ovl_verify_area()
A local attacker can trigger a kernel warning assertion in overlayfs by modifying lower file sizes, potentially causing system instability or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-27069?
CVE-2024-27069 is a medium-severity denial of service vulnerability in Linux kernel, published on 1 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ovl: relax WARN_ON in ovl_verify_area()
syzbot hit an assertion in copy up data loop which looks like it is the result of a lower file whose size is being changed underneath overlayfs.
This type of use case is documented to cause undefined behavior, so returning EIO error for the copy up makes sense, but it should not be causing a WARN_ON assertion.
Which versions are affected by CVE-2024-27069?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-27069?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2024-27069 being exploited?
There is no known exploitation of CVE-2024-27069 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-27069, GHSA-8gpf-qj7v-hp3f, UBUNTU-CVE-2024-27069.