External risk intelligence

Linux Kernel could allow local attackers to gain administrative root access

The Linux kernel could allow local attackers to gain administrative root access, potentially compromising host systems and critical infrastructure. As this flaw is being actively exploited in the wild, organizations should prioritize deploying vendor-supplied security updates to protect their operations.

NVD published April 22, 2026 (23 days ago)

External risk briefKnown Exploit

CVE-2026-31431

Halo Surface Signal

1/ 5

This is a local privilege escalation vulnerability within the Linux kernel. Successful exploitation requires the attacker to already have local access or an existing user session on the target system. It is not an entry vector directly reachable or exploitable from the public internet.

Exposure facts

CVSS

7.8

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

KEV

Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerability

EPSS

2.57%

H – Horizon Alert

A security concern has been identified within the Linux kernel related to how the system handles specific cryptographic data. This vulnerability involves an incorrect resource transfer between system components, which could potentially allow an unauthorized user to gain elevated access to the system. Addressing this is important, as the flaw could enable privilege escalation, potentially allowing an unauthorized party to gain administrative-level control over affected infrastructure.

A – Asset Exposure

This vulnerability affects infrastructure running the Linux Kernel, specifically impacting the cryptographic components used for data processing. If leveraged, this issue could result in unauthorized privilege escalation, potentially granting an attacker admin access to the host system. This risk is typically internal to the operating environment, and the actual exposure depends on whether your deployed applications rely on these specific kernel interfaces.

L – Live Threat

This vulnerability is currently recognized as actively exploited in the wild, as evidenced by its inclusion in federal threat catalogs. Furthermore, there is publicly available proof-of-concept exploit code associated with this issue, which increases the likelihood of potential targeting. Given these confirmed signals, organizations should be aware that the flaw could facilitate unauthorized privilege escalation.

O – Operational Fix

Security updates are now available to address a vulnerability in the Linux kernel that could potentially allow for unauthorized privilege escalation. As this issue is actively exploited, your IT and security teams should prioritize deploying the latest vendor-supplied kernel updates across all impacted systems. If immediate patching is not feasible, please consult your vendor's specific guidance for alternative mitigations or configuration changes to protect your infrastructure.