# CVE-2021-47061: linux: In the Linux kernel, the following vulnerability has been resolved:  KVM: Destroy I/O bus devices on unregister failu...

CVE-2021-47061 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47061, released February 29, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-47061
- 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: Destroy I/O bus devices on unregister failure _after_ sync'ing SRCU  If allocating a new instance of an I/O bus fails when unregistering a device, wait to destroy the device until after all readers are guaranteed to see the new null bus.  Destroying devices before the bus is nullified could lead to use-after-free since readers expect the devices on their reference of the bus to remain valid.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.10.38-1 | [DEBIAN-CVE-2021-47061](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47061.md) | Feb 29, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.10.38-1 | [DEBIAN-CVE-2021-47061](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47061.md) | Feb 29, 2024 |
| Linux | linux Debian 14 | 5.10.38-1 | [DEBIAN-CVE-2021-47061](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47061.md) | Feb 29, 2024 |

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