Tracker / CVE-2023-53515
CVE-2023-53515
High 7.8
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 and versions
| linux | linux_kernel |
|---|---|
| linux | linux_kernel · 4.15.1 → 4.19.293 |
| linux | linux_kernel · 4.20 → 5.4.255 |
| linux | linux_kernel · 5.11 → 5.15.128 |
| linux | linux_kernel · 5.16 → 6.1.47 |
| linux | linux_kernel · 5.5 → 5.10.192 |
| linux | linux_kernel · 6.2 → 6.4.12 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.