CVE-2026-99034: mmc: sdhci-sprd: disable runtime PM on remove
In the Linux kernel, the following vulnerability has been resolved:
mmc: sdhci-sprd: disable runtime PM on remove
sdhcisprdprobe() enables runtime PM, while sdhcisprdremove() does not perform the corresponding runtime PM cleanup.
The probe failure path disables runtime PM before disabling the clocks, but the normal remove path directly disables clocks that are also managed by the runtime PM callbacks. If the device is runtime suspended, those clocks may already be disabled.
Resume the device before removal, disable runtime PM and drop the temporary runtime PM reference before disabling the clocks.
This issue was found by manual code inspection.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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ubuntu/linuxto a version that resolves this vulnerability.Fixed in 7.0.0-43.43 - Upgrade
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ubuntu/linux-awsto a version that resolves this vulnerability.Fixed in 7.0.0-1017.18 - Upgrade
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ubuntu/linux-gcpto a version that resolves this vulnerability.Fixed in 7.0.0-1017.19 - Upgrade
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ubuntu/linux-gketo a version that resolves this vulnerability.Fixed in 7.0.0-1010.11 - Upgrade
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ubuntu/linux-realtimeto a version that resolves this vulnerability.Fixed in 7.0.0-43.43.1 - Configuration
In sdhci_sprd_remove(), resume the device before removal, disable runtime PM, and drop the temporary runtime PM reference before disabling the clocks.
Linux kernel mmc: sdhci-sprd runtime PM during device removal = disabled
Event History
Frequently Asked Questions
Which systems are exposed to this issue?
The issue affects Linux kernel systems using the Spreadtrum SDHCI driver (sdhci-sprd) where runtime power management is enabled for the device.
When can the issue occur?
It occurs during normal device removal when the device is runtime suspended. In that state, removal can disable clocks that runtime PM callbacks may have already disabled.
What mitigation is indicated if the fix cannot be applied immediately?
The described safe removal sequence is to resume the device before removal, disable runtime PM, and release the temporary runtime PM reference before disabling clocks.
How was this issue identified?
The issue was found through manual code inspection.