CVE-2021-29955 · cross-distro fix matrix

CVE-2021-29955: A transient execution vulnerability, named Floating Point Value Injection (FPVI) allowed an attacker to leak arbitrary memory addresses and may have also enabled JIT type confusion attacks. (A related vulnerability, Speculative Code Store Bypass (SCSB), did not affect Firefox.). This vulnerability a

Affects 3 Linux releases across 3 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2021-29955 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

firefox-esr→ fixed in78.9.0esr-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y firefox-esr
```

Debian bookworm

Source: Debian Security Tracker

firefox-esr→ fixed in78.9.0esr-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y firefox-esr
```

Debian trixie

Source: Debian Security Tracker

firefox-esr→ fixed in78.9.0esr-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y firefox-esr
```

Are YOU affected by CVE-2021-29955?

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

CVE-2021-29955dropped silently in your distro's update channel. Every new CVE is the same story. StackPatch runs the matcher hourly against all 5 sources and emails the exact remediation when something new applies to one of your servers. $99 lifetime, 50 founder seats, 30-day refund.

See StackPatch ($99 lifetime)