CVE-2023-53515
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.15%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.15% probability · 4th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/2dcb368fe5a8eee498ca75c93a18ce2f3b0d6a8ePatch
- https://git.kernel.org/stable/c/3ff54d904fafabd0912796785e53cce4e69ca123Patch
- https://git.kernel.org/stable/c/55c91fedd03d7b9cf0c5199b2eb12b9b8e95281aPatch
- https://git.kernel.org/stable/c/5b7d5c2dd664eb8b9a06ecbc06e28d39359c422ePatch
- https://git.kernel.org/stable/c/97a2d55ead76358245b446efd87818e919196d7aPatch
- https://git.kernel.org/stable/c/af5818c35173e096085c6ae2e3aac605d3d15e41Patch
- https://git.kernel.org/stable/c/b788ad3b2468512339c05f23692e36860264e674Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.