CVE-2021-47361
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.24%). 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: 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 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.24% probability · 16th 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/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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.