CVE-2021-47060 - CVE House
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Status published Unknown CVE-2021-47060

KVM: Stop looking for coalesced MMIO zones if the bus is destroyed

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: KVM: Stop looking for coalesced MMIO zones if the bus is destroyed Abort the walk of coalesced MMIO zones if kvm_io_bus_unregister_dev() fails to allocate memory for the new instance of the bus. If it can't instantiate a new bus, unregister_dev() destroys all devices _except_ the target device. But, it doesn't tell the caller that it obliterated the bus and invoked the destructor for all devices that were on the bus. In the coalesced MMIO case, this can result in a deleted list entry dereference due to attempting to continue iterating on coalesced_zones after future entries (in the walk) have been deleted. Opportunistically add curly braces to the for-loop, which encompasses many lines but sneaks by without braces due to the guts being a single if statement.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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Affected Vendor

Affected Software

Linux
Vulnerable Versions:
41b2ea7a6a11e2b1a7f2c29e1675a709a6b2b98d, f65886606c2d3b562716de030706dfe1bea4ed5e, f0dfffce3f4ffd5f822568a4a6fb34c010e939d1, 840e124f89a5127e7eb97ebf377f4b8ca745c070, 40a023f681befd9b2862a3c16fb306a38b359ae5, 19184bd06f488af62924ff1747614a8cb284ad63, 68c125324b5e1d1d22805653735442923d896a1d, 5.4.66, 4.4.238, 4.9.238, 4.14.200, 4.19.148, 5.8.10, 5.9, 0, 5.4.119, 5.10.37, 5.11.21, 5.12.4, 5.13

Timeline

Official Publish: February 29th, 2024
Last Modified: May 23rd, 2026
Added to House: July 21st, 2026

CVSS Vectors

No vector data available

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.