CVE-2025-40909 · cross-distro fix matrix

CVE-2025-40909: Perl threads have a working directory race condition where file operations may target unintended paths. If a directory handle is open at thread creation, the process-wide current working directory is temporarily changed in order to clone that handle for the new thread, which is visible from any thi

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

Fix per ecosystem

Each block below is a distro release where CVE-2025-40909 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

perl→ fixed in5.32.1-4+deb11u5urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y perl
```

Debian bookworm

Source: Debian Security Tracker

perl→ fixed in5.36.0-7+deb12u3urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y perl
```

Debian trixie

Source: Debian Security Tracker

perl→ fixed in5.40.1-5urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y perl
```

Are YOU affected by CVE-2025-40909?

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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