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CVE-2021-47284 is an error-handling flaw in the Linux kernel mISDN Netjet ISDN driver. During device probing, nj_setup can fail with an I/O error after the driver has populated card->irq. The cleanup routine, nj_release, then interprets that positive IRQ value as an allocated interrupt and invokes free_irq even though request_irq was never successfully called. The upstream correction removes the premature IRQ assignment and retains assignment immediately before the interrupt request operation.
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A low-severity Linux kernel vulnerability in the ISDN mISDN Netjet driver's nj_probe path that can cause a crash. The issue was resolved upstream and is fixed in multiple Linux kernel versions and Red Hat Enterprise Linux 8 updates.
A Linux kernel mISDN netjet driver flaw involving release of an unrequested IRQ after nj_setup failure. It can cause a local denial of service/kernel panic; Red Hat rates it CVSS 5.5 (local, low privileges required, high availability impact).
A Linux kernel mISDN NetJet driver error-handling flaw that can trigger an invalid free_irq call during device probing when setup fails, resulting in a kernel crash or panic.
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