CVE-2026-31399: nvdimm/bus: Fix potential use after free in asynchronous initialization

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-03 · updated 2026-07-24
Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: nvdimm/bus: Fix potential use after free in asynchronous initialization Dingisoul with KASAN reports a use after free if device_add() fails in nd_async_device_register(). Commit b6eae0f61db2 ("libnvdimm: Hold reference on parent while scheduling async init") correctly added a reference on the parent device to be held until asynchronous initialization was complete. However, if device_add() results in an allocation failure the ref count of the device drops to 0 prior to the parent pointer being accessed. Thus resulting in use after free. The bug bot AI correctly identified the fix. Save a reference to the parent pointer to be used to drop the parent reference regardless of the outcome of device_add().

Affected products

Linux kernel: from 4.4.164 before 4.5; from 4.9.137 before 4.10; from 4.14.81 before 4.15; from 4.18.19 before 4.19; from 4.19.2 before 5.10.253; from 5.11 before 5.15.203 — fixed in 4.10, 4.15, 4.19, 4.5, 5.10.253, 5.15.203

How to fix

Upgrade to a fixed version: Linux kernel 4.10, 4.15, 4.19, 4.5. Check the vendor advisory for mitigations.

References

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