# CVE-2026-99034: Linux kernel sdhci-sprd runtime PM cleanup on remove

Source: https://junglewise.ai/threats/cve-2026-99034-in-the-linux-kernel-the-following-vulnerability-has-been-resolved  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-23. Updated: 2026-10-23  
License: CC BY 4.0 with a link back

CVE-2026-99034 · Severity: info · Published 2026-10-23

The Linux kernel's SD Host Controller driver for Spreadtrum processors failed to properly disable runtime power management when removing the device, potentially leaving clocks disabled during shutdown. This could cause device driver malfunction or system instability when the SD card controller is removed or unloaded.

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

## Quick answers

**Is CVE-2026-99034 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-99034 being exploited in the wild.

**How severe is CVE-2026-99034?** Informational severity, published 23 October 2026.

**Which products and versions are affected?** Unknown Linux kernel versions with fb8bd90f83c4 applied, prior to fix commit e1c6c10a6a70a69e29b04fcc1ebe4b9bcbc7a49a.

**Is there a fix for CVE-2026-99034?** 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-2026-99034 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-99034?** Check whether you run Unknown Linux kernel at an affected version. 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

The sdhci_sprd_remove() function did not perform runtime PM cleanup that was enabled in sdhci_sprd_probe(), causing a clock management mismatch when the device was runtime suspended. The fix resumes the device, disables runtime PM, and drops the PM reference before disabling clocks, preventing attempts to disable already-suspended clock resources.

## Affected products

- <UNKNOWN> Linux kernel versions with fb8bd90f83c4 applied, prior to fix commit e1c6c10a6a70a69e29b04fcc1ebe4b9bcbc7a49a

## Timeline

- 2026-10-23: disclosed
- 2026-09-16: other: Patch authored

## References

- [https://git.kernel.org/stable/c/03244b8713d044425db5dbee08037ecd79b684f9](https://git.kernel.org/stable/c/03244b8713d044425db5dbee08037ecd79b684f9)
- [https://git.kernel.org/stable/c/3a1caa886d41d9bcc9a402906336eda34a90d323](https://git.kernel.org/stable/c/3a1caa886d41d9bcc9a402906336eda34a90d323)

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