Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 before 97a2d55ead76358245b446efd87818e919196d7a; affected 7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 before b788ad3b2468512339c05f23692e36860264e674; affected 7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 before 3ff54d904fafabd0912796785e53cce4e69ca123; affected 7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 before 5b7d5c2dd664eb8b9a06ecbc06e28d39359c422e; affected 7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 before af5818c35173e096085c6ae2e3aac605d3d15e41; affected 7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 before 2dcb368fe5a8eee498ca75c93a18ce2f3b0d6a8e; affected 7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 before 55c91fedd03d7b9cf0c5199b2eb12b9b8e95281a |
| Linux / Linux | affected 4.15; unaffected 0 before 4.15; unaffected 4.19.293 through 4.19.*; unaffected 5.4.255 through 5.4.*; unaffected 5.10.192 through 5.10.*; unaffected 5.15.128 through 5.15.*; unaffected 6.1.47 through 6.1.*; unaffected 6.4.12 through 6.4.*; unaffected 6.5 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/97a2d55ead76358245b446efd87818e919196d7a
- https://git.kernel.org/stable/c/b788ad3b2468512339c05f23692e36860264e674
- https://git.kernel.org/stable/c/3ff54d904fafabd0912796785e53cce4e69ca123
- https://git.kernel.org/stable/c/5b7d5c2dd664eb8b9a06ecbc06e28d39359c422e
- https://git.kernel.org/stable/c/af5818c35173e096085c6ae2e3aac605d3d15e41
- https://git.kernel.org/stable/c/2dcb368fe5a8eee498ca75c93a18ce2f3b0d6a8e
- https://git.kernel.org/stable/c/55c91fedd03d7b9cf0c5199b2eb12b9b8e95281a