CVE-2024-26866 spi: lpspi: Avoid potential use-after-free in probe()
A use-after-free vulnerability in the Linux kernel's LPSPI driver probe function can cause a system crash via NULL pointer dereference.
- 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-2024-26866?
CVE-2024-26866 is a medium-severity use after free vulnerability in Linux kernel, published on 17 Apr 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:
spi: lpspi: Avoid potential use-after-free in probe()
fsl_lpspi_probe() is allocating/disposing memory manually with spi_alloc_host()/spi_alloc_target(), but uses devm_spi_register_controller(). In case of error after the latter call the memory will be explicitly freed in the probe function by spi_controller_put() call, but used afterwards by "devm" management outside probe() (spi_unregister_controller() <- devm_spi_unregister() below).
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000070 ... Call trace: kernfs_find_ns kernfs_find_and_get_ns sysfs_remove_group sysfs_remove_groups device_remove_attrs device_del spi_unregister_controller devm_spi_unregister release_nodes devres_release_all really_probe driver_probe_device __device_attach_driver bus_for_each_drv __device_attach device_initial_probe bus_probe_device deferred_probe_work_func process_one_work worker_thread kthread ret_from_fork
Weakness: CWE-416
Which versions are affected by CVE-2024-26866?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-26866?
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-2024-26866 being exploited?
There is no known exploitation of CVE-2024-26866 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-55974, BELL-CVE-2024-26866, DEBIAN-CVE-2024-26866, GHSA-c37g-rxhp-7mqc, ROOT-OS-DEBIAN-11-CVE-2024-26866, ROOT-OS-DEBIAN-12-CVE-2024-26866 and 2 more.