CVE-2026-23014
Description
A use-after-free vulnerability was found in the Linux kernel's perf subsystem. When freeing a software event (swevent), the hrtimer used for sampling may still be active because perf_swevent_cancel_hrtimer() uses hrtimer_try_to_cancel() which can fail if the timer is currently executing. This leaves a dangling reference that can cause a use-after-free when the timer fires after the event structure is freed.
Statement
This race condition affects perf software events that use high-resolution timers for sampling. Exploitation requires the ability to create and destroy perf events rapidly, which requires CAP_PERFMON or CAP_SYS_ADMIN capabilities (or perf_event_paranoid sysctl allowing unprivileged access). The impact is a kernel crash or potential memory corruption.
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 | 5.5 | 5.5 | 7.8 |
| Attack Vector | Local | Local | Local |
| Attack Complexity | Low | Low | Low |
| Privileges Required | Low | Low | Low |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | None | None | High |
| Integrity Impact | None | None | High |
| Availability Impact | High | High | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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