CVE-2023-53515

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 < 97a2d55ead76358245b446efd87818e919196d7aaffected
LinuxLinux7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 < b788ad3b2468512339c05f23692e36860264e674affected
LinuxLinux7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 < 3ff54d904fafabd0912796785e53cce4e69ca123affected
LinuxLinux7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 < 5b7d5c2dd664eb8b9a06ecbc06e28d39359c422eaffected
LinuxLinux7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 < af5818c35173e096085c6ae2e3aac605d3d15e41affected
LinuxLinux7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 < 2dcb368fe5a8eee498ca75c93a18ce2f3b0d6a8eaffected
LinuxLinux7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 < 55c91fedd03d7b9cf0c5199b2eb12b9b8e95281aaffected
LinuxLinux4.15affected
LinuxLinux0 < 4.15unaffected
LinuxLinux4.19.293 <= 4.19.*unaffected
LinuxLinux5.4.255 <= 5.4.*unaffected
LinuxLinux5.10.192 <= 5.10.*unaffected
LinuxLinux5.15.128 <= 5.15.*unaffected
LinuxLinux6.1.47 <= 6.1.*unaffected
LinuxLinux6.4.12 <= 6.4.*unaffected
LinuxLinux6.5 <= *unaffected

Weaknesses

References