Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mcb: fix error handling in mcb_alloc_bus() There are two bugs: 1) If ida_simple_get() fails then this code calls put_device(carrier) but we haven't yet called get_device(carrier) and probably that leads to a use after free. 2) After device_initialize() then we need to use put_device() to release the bus. This will free the internal resources tied to the device and call mcb_free_bus() which will free the rest.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.7, < 4.9.285 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/115b07d9f47e3996430b8f2007edd9768e1f807fPatch
- https://git.kernel.org/stable/c/25a1433216489de4abc889910f744e952cb6dbaePatch
- https://git.kernel.org/stable/c/66f74ba9be9daf9c47fface6af3677f602774f6bPatch
- https://git.kernel.org/stable/c/7751f609eadf36b1f53712bae430019c53a16eb0Patch
- https://git.kernel.org/stable/c/8a558261fa57a6deefb0925ab1829f698b194aeaPatch
- https://git.kernel.org/stable/c/91e4ad05bf18322b5921d1a6c9b603f6eb1694f0Patch
- https://git.kernel.org/stable/c/9fc198f415dee070a1de957bb5bf5921d8df3499Patch
- https://git.kernel.org/stable/c/115b07d9f47e3996430b8f2007edd9768e1f807fPatch
- https://git.kernel.org/stable/c/25a1433216489de4abc889910f744e952cb6dbaePatch
- https://git.kernel.org/stable/c/66f74ba9be9daf9c47fface6af3677f602774f6bPatch
- https://git.kernel.org/stable/c/7751f609eadf36b1f53712bae430019c53a16eb0Patch
- https://git.kernel.org/stable/c/8a558261fa57a6deefb0925ab1829f698b194aeaPatch
- https://git.kernel.org/stable/c/91e4ad05bf18322b5921d1a6c9b603f6eb1694f0Patch
- https://git.kernel.org/stable/c/9fc198f415dee070a1de957bb5bf5921d8df3499Patch
FAQ
What is CVE-2021-47361?
CVE-2021-47361 is a vulnerability with a CVSS score of 7.8 (HIGH). In the Linux kernel, the following vulnerability has been resolved: mcb: fix error handling in mcb_alloc_bus() There are two bugs: 1) If ida_simple_get() fails then this code calls put_device(carrie...
How severe is CVE-2021-47361?
CVE-2021-47361 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47361?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.