Is CVE-2026-45251 actively exploited?

No active exploitation of CVE-2026-45251 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-45251 be exploited remotely?

No. CVE-2026-45251 requires local access to exploit.

What is the CVSS score of CVE-2026-45251?

CVE-2026-45251 has a CVSS score of 7.8 (HIGH).

HOME VULNERABILITIESCVE-2026-45251

HIGH

CVE-2026-45251

CWE-416Published: May 21, 2026· Updated: May 21, 2026

7.8

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:0.3th

Official Description

A file descriptor can be closed while a thread is blocked in a poll(2) or select(2) call waiting for that descriptor. Because the blocked thread does not hold a reference to the underlying object, this closure may result in the object being freed while the thread remains blocked. In this situation, the kernel must remove the blocked thread from the per-object wait queue prior to freeing the object.

In the case of some file descriptor types, the kernel failed to unlink blocked threads from the object before freeing it. When the blocked thread is subsequently woken, it accesses memory that has already been freed resulting in a use-after-free vulnerability.

The use-after-free vulnerability may be triggered by an unprivileged local user and can be exploited to obtain superuser privileges.

NVD Source

Technical Analysis

CVE-2026-45251 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.