CVE-2023-53515None▾ SunlitIn 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 corre…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
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.
Linux >= 7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 < 97a2d55ead76358245b446efd87818e919196d7aLinux >= 7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 < b788ad3b2468512339c05f23692e36860264e674Linux >= 7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 < 3ff54d904fafabd0912796785e53cce4e69ca123Linux >= 7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 < 5b7d5c2dd664eb8b9a06ecbc06e28d39359c422eLinux >= 7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 < af5818c35173e096085c6ae2e3aac605d3d15e41Linux >= 7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 < 2dcb368fe5a8eee498ca75c93a18ce2f3b0d6a8eLinux >= 7eb781b1bbb7136fe78fb8c28c1c223c61fa32b5 < 55c91fedd03d7b9cf0c5199b2eb12b9b8e95281aLinux 4.15Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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