# CVE-2021-47060: linux: In the Linux kernel, the following vulnerability has been resolved:  KVM: Stop looking for coalesced MMIO zones if th...

CVE-2021-47060 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47060, released February 29, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-47060
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 29, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.38-1 | [DEBIAN-CVE-2021-47060](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47060.md) | Feb 29, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.38-1 | [DEBIAN-CVE-2021-47060](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47060.md) | Feb 29, 2024 |
| Linux | linux Debian 14 | 5.10.38-1 | [DEBIAN-CVE-2021-47060](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47060.md) | Feb 29, 2024 |

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