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CVE-2026-89964: parisc: eisa: Fix infinite loop when parsing invalid IRQ value

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: parisc: eisa: Fix infinite loop when parsing invalid IRQ value When an invalid value is passed via the "eisa_irq_edge=" kernel command line parameter (e.g. "eisa_irq_edge=16,5"), eisa_irq_setup() prints an error message and continues without advancing the current position. As a result the same invalid value is parsed again and again, causing an infinite loop while the kernel boots. Advance to the next comma-separated entry, or stop parsing when there is no next entry, before continuing so that the remaining entries are processed normally.

Affected products

• Linux kernel: 2.6.12 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/16a62a3f2128b3d86fefc082d8f631becd02bff5
• https://git.kernel.org/stable/c/21f063e3c2b11fb9078ccdfd3b23634313ce4f0c
• https://git.kernel.org/stable/c/3e2691eeee83a819125dba3f42c74e1b6730d5cd
• https://git.kernel.org/stable/c/62d88e93ef5e1e04041e347945f7d7510eba1797
• https://git.kernel.org/stable/c/68659b627770f3c8d8f578e8ddee78a07d5f1d0e
• https://git.kernel.org/stable/c/8640ade22369e248f77fbdd31a9d71b338499eef
• https://git.kernel.org/stable/c/8b585431a16cfb9d8f2955a9fa0787ce3dceb3c2
• https://git.kernel.org/stable/c/bb10d54b74845eb4547baa1b9e908ecd32aa64e1

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