# CVE-2026-99215: Linux kernel power supply use-after-free in callback handling

Source: https://junglewise.ai/threats/cve-2026-99215-in-the-linux-kernel-the-following-vulnerability-has-been-resolved  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-28. Updated: 2026-10-28  
License: CC BY 4.0 with a link back

CVE-2026-99215 · Severity: info · Published 2026-10-28

The Linux kernel's power supply subsystem can crash when a power supply device is unregistered while its callback is still executing. If hardware malfunctions immediately after power supply registration, the kernel may attempt to access freed memory, causing a system crash or data corruption.

Technologies: [Linux Kernel](https://junglewise.ai/threats/technologies/kernel). Vendors: [Linux](https://junglewise.ai/threats/vendors/linux).

## Quick answers

**Is CVE-2026-99215 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-99215 being exploited in the wild.

**How severe is CVE-2026-99215?** Informational severity, published 28 October 2026.

**Which products and versions are affected?** Linux Linux kernel.

**Is there a fix for CVE-2026-99215?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-99215 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-99215?** Check whether you run Linux Kernel. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A use-after-free vulnerability exists in the power supply core when unregistering a power supply during active callback execution from other contexts like the TCPM stack. The vulnerability occurs because driver data can be freed while external_power_changed() callbacks are still running. The fix introduces a read-write semaphore between external_power_changed() and power_supply_unregister() to prevent premature data deallocation.

## Affected products

- Linux Linux kernel

## Timeline

- 2026-10-28: disclosed

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