CVE-2026-99234
Description
A flaw was found in the Linux kernel's tracing subsystem. When configuring event triggers, a failure during command parsing does not unregister the trigger before releasing its internal tracking memory. A local user with access to the kernel tracing interface could exploit this flaw by submitting a malformed command, leaving an active trigger that references freed memory. This issue can cause kernel memory corruption, leading to a system crash and Denial of Service (DoS).
Statement
This vulnerability is evaluated with a Moderate severity impact because triggering the flaw requires local execution and elevated administrative privileges on the target host. In default Red Hat Enterprise Linux environments, writing to event trigger interfaces in tracefs is restricted to root or users granted the CAP_SYS_ADMIN capability. Although improperly handled trigger errors can result in kernel memory corruption and a system crash, the prerequisite for high privileges contains the attack surface to trusted administrators.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4.4 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | High | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Other,Confidentiality,Integrity
Technical Impact: Other; Read Application Data; Modify Application Data; DoS: Resource Consumption (Other)
It is possible to overflow the number of temporary files because directories typically have limits on the number of files allowed. This could create a denial of service problem.
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