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CVE-2021-47060

7.8 · HIGH

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_unregis…

Published Feb 29, 2024EPSS 0.24%

Overview

CVE-2021-47060 is a high-severity vulnerability. It was published on February 29, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/168e82f640ed1891a700bdb43e37da354b2ab63cRefgit.kernel.org/stable/c/2a20592baff59c5351c5200ec667e1a2aa22af85Refgit.kernel.org/stable/c/50cbad42bfea8c052b7ca590bd4126cdc898713cRefgit.kernel.org/stable/c/5d3c4c79384af06e3c8e25b7770b6247496b4417Refgit.kernel.org/stable/c/7d1bc32d6477ff96a32695ea4be8144e4513ab2dRefgit.kernel.org/stable/c/168e82f640ed1891a700bdb43e37da354b2ab63cRefgit.kernel.org/stable/c/2a20592baff59c5351c5200ec667e1a2aa22af85Refgit.kernel.org/stable/c/50cbad42bfea8c052b7ca590bd4126cdc898713cRefgit.kernel.org/stable/c/5d3c4c79384af06e3c8e25b7770b6247496b4417Refgit.kernel.org/stable/c/7d1bc32d6477ff96a32695ea4be8144e4513ab2d

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47060?

CVE-2021-47060 is a high-severity vulnerability. It was published on February 29, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47060?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47060?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47060?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47060 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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