CVE-2026-64462 PCI: altera: Fix resource leaks on probe failure
A use-after-free vulnerability in the Linux kernel Altera PCI driver allows local attackers to cause denial of service or potentially execute code via probe failure.
- 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-2026-64462?
CVE-2026-64462 is an use after free vulnerability in Linux, published on 25 Jul 2026. 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: altera: Fix resource leaks on probe failure
The chained IRQ handler is set during probe, but is only removed during the driver remove(). If pci_host_probe() fails, the handler and INTx IRQ domain remain set even though the devm-managed host bridge storage containing struct altera_pcie will be released, leaving the handler with a stale data pointer.
Interrupts are also enabled before pci_host_probe() is called. If probe fails after that point, the controller interrupt source should be disabled before the chained handler and INTx domain are removed.
So set the chained handler only after the INTx domain has been created. Disable controller interrupts during IRQ teardown, and tear the IRQ setup down if pci_host_probe() fails.
[mani: commit log]
Which versions are affected by CVE-2026-64462?
How do I fix CVE-2026-64462?
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-2026-64462 being exploited?
There is no known exploitation of CVE-2026-64462 in the wild and no public exploit code.
Sources
Also known as AZL-93786, BELL-CVE-2026-64462, DEBIAN-CVE-2026-64462, GHSA-w9v7-p38p-x494, ROOT-OS-UBUNTU-2204-CVE-2026-64462, UBUNTU-CVE-2026-64462.