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CVE-2026-72214: power: supply: cpcap-battery: Fix missing nvmem_device_put() causing reference leak

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-08-17

Description

In the Linux kernel, the following vulnerability has been resolved: power: supply: cpcap-battery: Fix missing nvmem_device_put() causing reference leak In cpcap_battery_detect_battery_type(), the reference to an nvmem device obtained via nvmem_device_find() is not released with nvmem_device_put() on the success or read-failure paths, causing a permanent reference leak. The driver’s retry logic on subsequent battery property reads can compound this leak, preventing the nvmem device from ever being freed. Found by code review.

Affected products

• Linux kernel: 5.18 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/700c225d829a1256b59053c34a1a9d1a6ab70b09
• https://git.kernel.org/stable/c/a2c14ff63e0e02e3c832385e523e9cc81301171c
• https://git.kernel.org/stable/c/a3d81de441233a92ec21469cd0c4eb3c26b95cd8
• https://git.kernel.org/stable/c/b56a5cbf8f1f1a5740f1137c89b14d0373309d8d
• https://git.kernel.org/stable/c/deaf6b3f8187231ad8f7770b10ed0be2cd47e9b2
• https://git.kernel.org/stable/c/fc65520fe0781a1ff46631f111e07b4a1c677b96

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