---
id: CVE-2026-99142
title: 'tracing: Check operator stack capacity before pushing'
summary: |-
  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 incr…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 39f7c41c908bc82947ce47cdd021520ff486c53f <
    a866a8a753922cdf7710b8eb3f686dc0efc06505
  - >-
    Linux >= 39f7c41c908bc82947ce47cdd021520ff486c53f <
    75e894f92417390f0ef44fd350f2d3634c784876
  - >-
    Linux >= 39f7c41c908bc82947ce47cdd021520ff486c53f <
    c47a7b11bcb3d45e29723afcf6336866476b1d08
  - Linux 6.6
published: '2026-10-28'
updated: '2026-10-28'
sourceUpdated: '2026-10-28T10:34:53.839Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-99142'
references:
  - url: 'https://git.kernel.org/stable/c/a866a8a753922cdf7710b8eb3f686dc0efc06505'
  - url: 'https://git.kernel.org/stable/c/75e894f92417390f0ef44fd350f2d3634c784876'
  - url: 'https://git.kernel.org/stable/c/c47a7b11bcb3d45e29723afcf6336866476b1d08'
tags:
  - cve.org
ingestedAt: '2026-10-28T11:09:40.427Z'
---

## Overview

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.

## Affected

- `Linux >= 39f7c41c908bc82947ce47cdd021520ff486c53f < a866a8a753922cdf7710b8eb3f686dc0efc06505`
- `Linux >= 39f7c41c908bc82947ce47cdd021520ff486c53f < 75e894f92417390f0ef44fd350f2d3634c784876`
- `Linux >= 39f7c41c908bc82947ce47cdd021520ff486c53f < c47a7b11bcb3d45e29723afcf6336866476b1d08`
- `Linux 6.6`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.