UBUNTU-CVE-2026-64462: Medium severity ubuntu/linux-hwe-edge vulnerability
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 pcihostprobe() fails, the handler and INTx IRQ domain remain set even though the devm-managed host bridge storage containing struct alterapcie will be released, leaving the handler with a stale data pointer. Interrupts are also enabled before pcihostprobe() 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 pcihostprobe() fails. [mani: commit log]
Affected Software
Remediation
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Disable the controller interrupt source before removing the chained IRQ handler and INTx IRQ domain.
Altera PCIe controller controller interrupt source during IRQ teardown = disabled - Compensating control
Tear down the chained IRQ handler and INTx IRQ domain if pci_host_probe() fails, and set the chained handler only after the INTx IRQ domain has been created.
Event History
Frequently Asked Questions
When can this issue be triggered?
It can be triggered when the Altera PCIe host controller driver's probe path fails after interrupts have been enabled. The failure leaves IRQ-related state in place while the associated devm-managed driver data is released.
What is the impact of a failed probe?
A chained IRQ handler and INTx IRQ domain can remain configured with a stale data pointer. Subsequent interrupts may reach the stale handler, and controller interrupt sources may remain enabled.
What does the fix change?
The fix creates the INTx domain before installing the chained handler, disables controller interrupts during IRQ teardown, and tears down IRQ setup when pci_host_probe() fails.