CVE-2021-30465 · cross-distro fix matrix

CVE-2021-30465: runc before 1.0.0-rc95 allows a Container Filesystem Breakout via Directory Traversal. To exploit the vulnerability, an attacker must be able to create multiple containers with a fairly specific mount configuration. The problem occurs via a symlink-exchange attack that relies on a race condition.

Affects 8 Linux releases across 13 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-30465 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

runc→ fixed in1.0.0~rc93+ds1-5urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y runc
```

Debian bookworm

Source: Debian Security Tracker

runc→ fixed in1.0.0~rc93+ds1-5urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y runc
```

Debian trixie

Source: Debian Security Tracker

runc→ fixed in1.0.0~rc93+ds1-5urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y runc
```

Alpine v3.20

Source: Alpine secdb

k3s→ fixed in1.21.1.1-r0
```
apk update && apk add --upgrade k3s
```
runc→ fixed in1.0.0_rc95-r0
```
apk update && apk add --upgrade runc
```

Alpine v3.21

Source: Alpine secdb

k3s→ fixed in1.21.1.1-r0
```
apk update && apk add --upgrade k3s
```
runc→ fixed in1.0.0_rc95-r0
```
apk update && apk add --upgrade runc
```

Alpine edge

Source: Alpine secdb

k3s→ fixed in1.21.1.1-r0
```
apk update && apk add --upgrade k3s
```
runc→ fixed in1.0.0_rc95-r0
```
apk update && apk add --upgrade runc
```

Alpine v3.18

Source: Alpine secdb

k3s→ fixed in1.21.1.1-r0
```
apk update && apk add --upgrade k3s
```
runc→ fixed in1.0.0_rc95-r0
```
apk update && apk add --upgrade runc
```

Alpine v3.19

Source: Alpine secdb

k3s→ fixed in1.21.1.1-r0
```
apk update && apk add --upgrade k3s
```
runc→ fixed in1.0.0_rc95-r0
```
apk update && apk add --upgrade runc
```

Are YOU affected by CVE-2021-30465?

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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