CVE-2021-20221 · cross-distro fix matrix

CVE-2021-20221: An out-of-bounds heap buffer access issue was found in the ARM Generic Interrupt Controller emulator of QEMU up to and including qemu 4.2.0on aarch64 platform. The issue occurs because while writing an interrupt ID to the controller memory area, it is not masked to be 4 bits wide. It may lead to the

Affects 8 Linux releases across 8 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-20221 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

qemu→ fixed in1:5.2+dfsg-4urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y qemu
```

Debian bookworm

Source: Debian Security Tracker

qemu→ fixed in1:5.2+dfsg-4urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y qemu
```

Debian trixie

Source: Debian Security Tracker

qemu→ fixed in1:5.2+dfsg-4urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y qemu
```

Alpine v3.20

Source: Alpine secdb

qemu→ fixed in5.0.0-r0
```
apk update && apk add --upgrade qemu
```

Alpine v3.21

Source: Alpine secdb

qemu→ fixed in5.0.0-r0
```
apk update && apk add --upgrade qemu
```

Alpine edge

Source: Alpine secdb

qemu→ fixed in5.0.0-r0
```
apk update && apk add --upgrade qemu
```

Alpine v3.18

Source: Alpine secdb

qemu→ fixed in5.0.0-r0
```
apk update && apk add --upgrade qemu
```

Alpine v3.19

Source: Alpine secdb

qemu→ fixed in5.0.0-r0
```
apk update && apk add --upgrade qemu
```

Are YOU affected by CVE-2021-20221?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

curl https://mindsparkstack.com/scan.sh | bash

Form-based quickscan View on NVD

Continuous monitoring beats manual checking

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