CVE-2026-31399
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().
How to fix
- linux linux_kernel4.5, 4.10, 4.15, 4.19, 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.20, 6.19.10 or later
- git.kernel.org/stable/c/2c638259ad750833fd46a0cf57672a618542d84c
- git.kernel.org/stable/c/6fc36c2a925ceaba203eb13d75a8f0879a2c121b
- git.kernel.org/stable/c/84af19855d1abdee3c9d57c0684e2868e391793c
- git.kernel.org/stable/c/9a0fb16ba5b372465a3a1ecd761c6fa911a4ab4d
- git.kernel.org/stable/c/a226e5b49e5fe8c98b14f8507de670189d191348
- git.kernel.org/stable/c/a36cf138500e56f50db9f9a33222df6969b38326
- git.kernel.org/stable/c/a8aec14230322ed8f1e8042b6d656c1631d41163
- git.kernel.org/stable/c/e48bf8f1d2b12c1c5ba1f609edbd4cde5dadc20e
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 4.4.164 ≤ v < 4.5, 4.9.137 ≤ v < 4.10, 4.14.81 ≤ v < 4.15, 4.18.19 ≤ v < 4.19, 4.19.2 ≤ v < 5.10.253, 5.11 ≤ v < 5.15.203, 5.16 ≤ v < 6.1.167, 6.2 ≤ v < 6.6.130, 6.7 ≤ v < 6.12.78, 6.13 ≤ v < 6.18.20, 6.19 ≤ v < 6.19.10, 7.0 | 4.5, 4.10, 4.15, 4.19, 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.20, 6.19.10 |
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