Description
In the Linux kernel, the following vulnerability has been resolved: virtio-mmio: don't break lifecycle of vm_dev vm_dev has a separate lifecycle because it has a 'struct device' embedded. Thus, having a release callback for it is correct. Allocating the vm_dev struct with devres totally breaks this protection, though. Instead of waiting for the vm_dev release callback, the memory is freed when the platform_device is removed. Resulting in a use-after-free when finally the callback is to be called. To easily see the problem, compile the kernel with CONFIG_DEBUG_KOBJECT_RELEASE and unbind with sysfs. The fix is easy, don't use devres in this case. Found during my research about object lifetime problems.
Affected products
linux: linux kernel
References7
- git.kernel.org/stable/c/2dcb368fe5a8eee498ca75c93a18ce2f3b0d6a8e Patch
- git.kernel.org/stable/c/3ff54d904fafabd0912796785e53cce4e69ca123 Patch
- git.kernel.org/stable/c/55c91fedd03d7b9cf0c5199b2eb12b9b8e95281a Patch
- git.kernel.org/stable/c/5b7d5c2dd664eb8b9a06ecbc06e28d39359c422e Patch
- git.kernel.org/stable/c/97a2d55ead76358245b446efd87818e919196d7a Patch
- git.kernel.org/stable/c/af5818c35173e096085c6ae2e3aac605d3d15e41 Patch
- git.kernel.org/stable/c/b788ad3b2468512339c05f23692e36860264e674 Patch
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 4 · as of 9 November 2026
- CWE
- CWE-416
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.