CVE-2024-58093 PCI/ASPM: Fix link state exit during switch upstream function removal
A use-after-free in the Linux kernel PCI/ASPM subsystem can cause a general protection fault during device hot-unplug, leading to system crashes.
- 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-2024-58093?
CVE-2024-58093 is a high-severity use after free vulnerability in Linux kernel, published on 16 Apr 2025. 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:
PCI/ASPM: Fix link state exit during switch upstream function removal
Before 456d8aa37d0f ("PCI/ASPM: Disable ASPM on MFD function removal to avoid use-after-free"), we would free the ASPM link only after the last function on the bus pertaining to the given link was removed.
That was too late. If function 0 is removed before sibling function, link->downstream would point to free'd memory after.
After above change, we freed the ASPM parent link state upon any function removal on the bus pertaining to a given link.
That is too early. If the link is to a PCIe switch with MFD on the upstream port, then removing functions other than 0 first would free a link which still remains parent_link to the remaining downstream ports.
The resulting GPFs are especially frequent during hot-unplug, because pciehp removes devices on the link bus in reverse order.
On that switch, function 0 is the virtual P2P bridge to the internal bus. Free exactly when function 0 is removed -- before the parent link is obsolete, but after all subordinate links are gone.
[kwilczynski: commit log]
Weakness: CWE-416
Which versions are affected by CVE-2024-58093?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-58093?
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-2024-58093 being exploited?
There is no known exploitation of CVE-2024-58093 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-58093, DEBIAN-CVE-2024-58093, GHSA-xcjf-5v2r-gvc9, ROOT-OS-DEBIAN-11-CVE-2024-58093, ROOT-OS-DEBIAN-12-CVE-2024-58093, ROOT-OS-DEBIAN-13-CVE-2024-58093 and 1 more.