CVE-2026-31399: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

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 Linux Kernel: from 4.4.164, before 4.5 (fixed in 4.5); from 4.9.137, before 4.10 (fixed in 4.10); from 4.14.81, before 4.15 (fixed in 4.15); from 4.18.19, before 4.19 (fixed in 4.19); from 4.19.2, before 5.10.253 (fixed in 5.10.253); from 5.11, before 5.15.203 (fixed in 5.15.203); …

Published 2026-04-03. Last modified 2026-07-24.