Bug 2507221 (CVE-2026-64462)

Summary: CVE-2026-64462 kernel: PCI: altera: Fix resource leaks on probe failure
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: unspecified Docs Contact:
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's PCI Altera driver. When the driver fails to initialize properly, it can leave interrupt handlers and related resources active with outdated information. This resource leak and stale data pointer can lead to system instability or a denial of service, where the system becomes unresponsive or crashes.
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Description OSIDB Bzimport 2026-07-25 10:11:24 UTC 
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]
Comment 1 Mauro Matteo Cascella 2026-08-02 13:21:53 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026072543-CVE-2026-64462-85ea@gregkh/T