CVE-2021-47061
In the Linux kernel, the following vulnerability has been resolved: KVM: Destroy I/O bus devices on unregister failure _after_ sync'ing SRCU If allocating a new instance of an I/O bus fails when unregistering a device, wait to destroy the device until…
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: KVM: Destroy I/O bus devices on unregister failure _after_ sync'ing SRCU If allocating a new instance of an I/O bus fails when unregistering a device, wait to destroy the device until after all readers are guaranteed to see the new null bus. Destroying devices before the bus is nullified could lead to use-after-free since readers expect the devices on their reference of the bus to remain valid.
- 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 · 15th 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/03c6cccedd3913006744faa252a4da5145299343Patch
- https://git.kernel.org/stable/c/2ee3757424be7c1cd1d0bbfa6db29a7edd82a250Patch
- https://git.kernel.org/stable/c/30f46c6993731efb2a690c9197c0fd9ed425da2dPatch
- https://git.kernel.org/stable/c/4e899ca848636b37e9ac124bc1723862a7d7d927Patch
- https://git.kernel.org/stable/c/03c6cccedd3913006744faa252a4da5145299343Patch
- https://git.kernel.org/stable/c/2ee3757424be7c1cd1d0bbfa6db29a7edd82a250Patch
- https://git.kernel.org/stable/c/30f46c6993731efb2a690c9197c0fd9ed425da2dPatch
- https://git.kernel.org/stable/c/4e899ca848636b37e9ac124bc1723862a7d7d927Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.