CVE-2024-50093 thermal: intel: int340x: processor: Fix warning during module unload
A bug in the Intel processor thermal driver causes a kernel warning during module unload, potentially leading to 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-2024-50093?
CVE-2024-50093 is a medium-severity denial of service vulnerability in Linux kernel, published on 5 Nov 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:
thermal: intel: int340x: processor: Fix warning during module unload
The processor_thermal driver uses pcim_device_enable() to enable a PCI device, which means the device will be automatically disabled on driver detach. Thus there is no need to call pci_disable_device() again on it.
With recent PCI device resource management improvements, e.g. commit f748a07a0b64 ("PCI: Remove legacy pcim_release()"), this problem is exposed and triggers the warining below.
[ 224.010735] proc_thermal_pci 0000:00:04.0: disabling already-disabled device [ 224.010747] WARNING: CPU: 8 PID: 4442 at drivers/pci/pci.c:2250 pci_disable_device+0xe5/0x100 ... [ 224.010844] Call Trace: [ 224.010845] <TASK> [ 224.010847] ? show_regs+0x6d/0x80 [ 224.010851] ? __warn+0x8c/0x140 [ 224.010854] ? pci_disable_device+0xe5/0x100 [ 224.010856] ? report_bug+0x1c9/0x1e0 [ 224.010859] ? handle_bug+0x46/0x80 [ 224.010862] ? exc_invalid_op+0x1d/0x80 [ 224.010863] ? asm_exc_invalid_op+0x1f/0x30 [ 224.010867] ? pci_disable_device+0xe5/0x100 [ 224.010869] ? pci_disable_device+0xe5/0x100 [ 224.010871] ? kfree+0x21a/0x2b0 [ 224.010873] pcim_disable_device+0x20/0x30 [ 224.010875] devm_action_release+0x16/0x20 [ 224.010878] release_nodes+0x47/0xc0 [ 224.010880] devres_release_all+0x9f/0xe0 [ 224.010883] device_unbind_cleanup+0x12/0x80 [ 224.010885] device_release_driver_internal+0x1ca/0x210 [ 224.010887] driver_detach+0x4e/0xa0 [ 224.010889] bus_remove_driver+0x6f/0xf0 [ 224.010890] driver_unregister+0x35/0x60 [ 224.010892] pci_unregister_driver+0x44/0x90 [ 224.010894] proc_thermal_pci_driver_exit+0x14/0x5f0 [processor_thermal_device_pci] ... [ 224.010921] ---[ end trace 0000000000000000 ]---
Remove the excess pci_disable_device() calls.
[ rjw: Subject and changelog edits ]
Which versions are affected by CVE-2024-50093?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-50093?
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-2024-50093 being exploited?
There is no known exploitation of CVE-2024-50093 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-52489, BELL-CVE-2024-50093, DEBIAN-CVE-2024-50093, GHSA-cjm2-6jxj-2465, UBUNTU-CVE-2024-50093.