CVE-2023-52765 mfd: qcom-spmi-pmic: Fix revid implementation
A null pointer dereference in the Qualcomm SPMI PMIC driver can cause a kernel crash, requiring a patch to the Linux kernel.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-52765?
CVE-2023-52765 is a medium-severity vulnerability in Linux kernel, published on 21 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:
mfd: qcom-spmi-pmic: Fix revid implementation
The Qualcomm SPMI PMIC revid implementation is broken in multiple ways.
First, it assumes that just because the sibling base device has been registered that means that it is also bound to a driver, which may not be the case (e.g. due to probe deferral or asynchronous probe). This could trigger a NULL-pointer dereference when attempting to access the driver data of the unbound device.
Second, it accesses driver data of a sibling device directly and without any locking, which means that the driver data may be freed while it is being accessed (e.g. on driver unbind).
Third, it leaks a struct device reference to the sibling device which is looked up using the spmi_device_from_of() every time a function (child) device is calling the revid function (e.g. on probe).
Fix this mess by reimplementing the revid lookup so that it is done only at probe of the PMIC device; the base device fetches the revid info from the hardware, while any secondary SPMI device fetches the information from the base device and caches it so that it can be accessed safely from its children. If the base device has not been probed yet then probe of a secondary device is deferred.
Weakness: CWE-476
Which versions are affected by CVE-2023-52765?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-52765?
Apply the vendor's patch.
Is CVE-2023-52765 being exploited?
There is no known exploitation of CVE-2023-52765 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2023-52765, DEBIAN-CVE-2023-52765, GHSA-wgf9-7m97-x4xg, UBUNTU-CVE-2023-52765.