CVE-2019-5094

What it actually does

Out-of-bounds write on the heap in quota file handling of e2fsprogs allows arbitrary code execution when processing a malicious ext4 partition.

Why it matters to the business

Attackers with local access could execute code on systems processing untrusted disk images or partitions, risking compromise of affected infrastructure; the vulnerability affects 98 downstream dependents and remains exploitable years after disclosure despite available patches.

How an attack unfolds

An attacker creates a specially crafted ext4 partition that triggers an out-of-bounds write during quota file processing in e2fsprogs; when a privileged process such as a file-system tool or dependent application like TensorFlow mounts or inspects the partition, the heap corruption leads to code execution. Public exploits exist and the flaw has been known since 2019.

How to fix it

Upgrade e2fsprogs to a version beyond 1.45.3 and ensure dependent packages such as tensorflow (Bitnami) are updated to at least 2.6.1; rebuild any containers or images that bundle the vulnerable library.

How to confirm the fix worked

Confirm e2fsprogs version is newer than 1.45.3 via package manager or binary inspection; verify tensorflow (Bitnami) reports version 2.6.1 or later; test by attempting to process a known-good partition with the updated tools.

Typical attack path

1. Attacker crafts malicious ext4 partition with corrupted quota structures
2. Victim system or application processes or mounts the tainted partition using affected e2fsprogs
3. Out-of-bounds write occurs on the heap during quota parsing
4. Attacker gains arbitrary code execution in the context of the processing process

How to detect it

Review process execution logs and file-system tool invocations for unexpected crashes or errors when handling ext4 volumes; look for child processes spawned from e2fsprogs binaries or dependent applications after partition operations; check package versions in build artifacts and running containers.

What your security team should do

• Prioritize patching tensorflow (Bitnami) deployments to 2.6.1 or newer within standard change windows
• Inventory all systems and containers using e2fsprogs or its dependents and schedule upgrades
• Restrict local access to systems that process untrusted disk images until patched
• Monitor EPSS and exploit availability trends; no CISA KEV listing reduces immediate external urgency but does not eliminate local risk