Bugzilla – Bug 1222625
VUL-0: CVE-2024-27437: kernel: vfio/pci: Disable auto-enable of exclusive INTx IRQ
Last modified: 2024-05-03 16:48:20 UTC
In the Linux kernel, the following vulnerability has been resolved: vfio/pci: Disable auto-enable of exclusive INTx IRQ Currently for devices requiring masking at the irqchip for INTx, ie. devices without DisINTx support, the IRQ is enabled in request_irq() and subsequently disabled as necessary to align with the masked status flag. This presents a window where the interrupt could fire between these events, resulting in the IRQ incrementing the disable depth twice. This would be unrecoverable for a user since the masked flag prevents nested enables through vfio. Instead, invert the logic using IRQF_NO_AUTOEN such that exclusive INTx is never auto-enabled, then unmask as required. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-27437 https://www.cve.org/CVERecord?id=CVE-2024-27437 https://git.kernel.org/stable/c/139dfcc4d723ab13469881200c7d80f49d776060 https://git.kernel.org/stable/c/2a4a666c45107206605b7b5bc20545f8aabc4fa2 https://git.kernel.org/stable/c/3b3491ad0f80d913e7d255941d4470f4a4d9bfda https://git.kernel.org/stable/c/bf0bc84a20e6109ab07d5dc072067bd01eb931ec https://git.kernel.org/stable/c/fe9a7082684eb059b925c535682e68c34d487d43 https://bugzilla.redhat.com/show_bug.cgi?id=2273657 https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-27437.mbox