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CVE-2021-44538 · cross-distro fix matrix

CVE-2021-44538: The olm_session_describe function in Matrix libolm before 3.2.7 is vulnerable to a buffer overflow. The Olm session object represents a cryptographic channel between two parties. Therefore, its state is partially controllable by the remote party of the channel. Attackers can construct a crafted sequ

Affects 8 Linux releases across 15 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-44538 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

  • thunderbird→ fixed in1:91.4.1-1~deb11u1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y thunderbird

Debian bookworm

Source: Debian Security Tracker

  • olm→ fixed in3.2.8~dfsg-1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y olm
  • thunderbird→ fixed in1:91.4.1-1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y thunderbird

Debian trixie

Source: Debian Security Tracker

  • olm→ fixed in3.2.8~dfsg-1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y olm
  • thunderbird→ fixed in1:91.4.1-1urgency: not yet assigned
    sudo apt-get install --only-upgrade -y thunderbird

Alpine v3.20

Source: Alpine secdb

  • element-web→ fixed in1.9.7-r0
    apk update && apk add --upgrade element-web
  • thunderbird→ fixed in91.4.1-r0
    apk update && apk add --upgrade thunderbird

Alpine v3.21

Source: Alpine secdb

  • element-web→ fixed in1.9.7-r0
    apk update && apk add --upgrade element-web
  • thunderbird→ fixed in91.4.1-r0
    apk update && apk add --upgrade thunderbird

Alpine edge

Source: Alpine secdb

  • element-web→ fixed in1.9.7-r0
    apk update && apk add --upgrade element-web
  • thunderbird→ fixed in91.4.1-r0
    apk update && apk add --upgrade thunderbird

Alpine v3.18

Source: Alpine secdb

  • element-web→ fixed in1.9.7-r0
    apk update && apk add --upgrade element-web
  • thunderbird→ fixed in91.4.1-r0
    apk update && apk add --upgrade thunderbird

Alpine v3.19

Source: Alpine secdb

  • element-web→ fixed in1.9.7-r0
    apk update && apk add --upgrade element-web
  • thunderbird→ fixed in91.4.1-r0
    apk update && apk add --upgrade thunderbird
Are YOU affected by CVE-2021-44538?

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.

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