CVE-2021-47060
KVM: Stop looking for coalesced MMIO zones if the bus is destroyed
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.
INFO
Published Date :
Feb. 29, 2024, 11:15 p.m.
Last Modified :
April 8, 2025, 3:01 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update the affected Linux kernel packages.
- Reboot the system to apply the update.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-47060.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-47060 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-47060
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-47060 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-47060 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Apr. 08, 2025
Action Type Old Value New Value Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.11.21 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.12 up to (excluding) 5.12.4 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.9 up to (excluding) 5.10.37 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.4.66 up to (excluding) 5.4.119 Added Reference Type CVE: https://git.kernel.org/stable/c/168e82f640ed1891a700bdb43e37da354b2ab63c Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/168e82f640ed1891a700bdb43e37da354b2ab63c Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/2a20592baff59c5351c5200ec667e1a2aa22af85 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/2a20592baff59c5351c5200ec667e1a2aa22af85 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/50cbad42bfea8c052b7ca590bd4126cdc898713c Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/50cbad42bfea8c052b7ca590bd4126cdc898713c Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/5d3c4c79384af06e3c8e25b7770b6247496b4417 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/5d3c4c79384af06e3c8e25b7770b6247496b4417 Types: Patch Added Reference Type CVE: https://git.kernel.org/stable/c/7d1bc32d6477ff96a32695ea4be8144e4513ab2d Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/7d1bc32d6477ff96a32695ea4be8144e4513ab2d Types: Patch -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/168e82f640ed1891a700bdb43e37da354b2ab63c Added Reference https://git.kernel.org/stable/c/2a20592baff59c5351c5200ec667e1a2aa22af85 Added Reference https://git.kernel.org/stable/c/50cbad42bfea8c052b7ca590bd4126cdc898713c Added Reference https://git.kernel.org/stable/c/5d3c4c79384af06e3c8e25b7770b6247496b4417 Added Reference https://git.kernel.org/stable/c/7d1bc32d6477ff96a32695ea4be8144e4513ab2d -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Nov. 07, 2024
Action Type Old Value New Value Added CVSS V3.1 CISA-ADP AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 28, 2024
Action Type Old Value New Value -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 14, 2024
Action Type Old Value New Value -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Feb. 29, 2024
Action Type Old Value New Value Added 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. Added Reference Linux https://git.kernel.org/stable/c/7d1bc32d6477ff96a32695ea4be8144e4513ab2d [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/2a20592baff59c5351c5200ec667e1a2aa22af85 [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/168e82f640ed1891a700bdb43e37da354b2ab63c [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/50cbad42bfea8c052b7ca590bd4126cdc898713c [No types assigned] Added Reference Linux https://git.kernel.org/stable/c/5d3c4c79384af06e3c8e25b7770b6247496b4417 [No types assigned]