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CVE-2021-3995 · cross-distro fix matrix

CVE-2021-3995: A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows an unprivileged local attacker to unmount FUSE filesystems that belong to certain other users who have a UID that is a prefix of the UID of th

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

Fix per ecosystem

Each block below is a distro release where CVE-2021-3995 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

  • util-linux→ fixed in2.36.1-8+deb11u1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y util-linux

Debian bookworm

Source: Debian Security Tracker

  • util-linux→ fixed in2.37.3-1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y util-linux

Debian trixie

Source: Debian Security Tracker

  • util-linux→ fixed in2.37.3-1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y util-linux

Alpine v3.20

Source: Alpine secdb

  • util-linux→ fixed in2.37.3-r0
    apk update && apk add --upgrade util-linux

Alpine v3.21

Source: Alpine secdb

  • util-linux→ fixed in2.37.3-r0
    apk update && apk add --upgrade util-linux

Alpine edge

Source: Alpine secdb

  • util-linux→ fixed in2.37.3-r0
    apk update && apk add --upgrade util-linux

Alpine v3.18

Source: Alpine secdb

  • util-linux→ fixed in2.37.3-r0
    apk update && apk add --upgrade util-linux

Alpine v3.19

Source: Alpine secdb

  • util-linux→ fixed in2.37.3-r0
    apk update && apk add --upgrade util-linux
Are YOU affected by CVE-2021-3995?

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