CVE-2021-47060

Medium

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.

Package Linux Kernel
Published 2024-02-29
Last modified 2025-04-08
CVSS version 3.1
Patch available
Yes

CVSS 3.1 score

6.0

out of 10
Medium
Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High
Vector string
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H

Affected versions

Linux kernel versions 5.4.66, 4.4.238, 4.9.238, 4.14.200, 4.19.148, 5.8.10, 5.9 and later are affected. Fixed in 5.4.119, 5.10.37, 5.11.21, 5.12.4, 5.13 and their respective stable series.

Affected from
≥ 5.4.66 ≥ 4.4.238 ≥ 4.9.238 ≥ 4.14.200 ≥ 4.19.148 ≥ 5.8.10 ≥ 5.9
Fixed in
✓ 5.4.119 5.4.x ✓ 5.10.37 5.10.x ✓ 5.11.21 5.11.x ✓ 5.12.4 5.12.x ✓ 5.13

References

5 total

Frequently asked questions

  • What is CVE-2021-47060?

    CVE-2021-47060 is a Medium severity Linux kernel vulnerability with a CVSS score of 6.0 out of 10 . It affects Linux kernel versions from 5.4.66 onward and has been patched in 5.4.119, 5.10.37, 5.11.21 and others. CVE-2021-47060 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2021-47060?

    CVE-2021-47060 has a CVSS score of 6.0 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H .

  • Is there a patch available for CVE-2021-47060?

    Yes. CVE-2021-47060 has been patched. Fixed versions include 5.4.119, 5.10.37, 5.11.21 and others. If you are running Linux kernel 5.4.66 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2021-47060 actively exploited?

    No. CVE-2021-47060 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Back to
All CVEs
View on
NVD / NIST