CVE-2026-52940

medium Red Hat
CVSS v3 Base Score
7.0
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score
0.2%
Exploitation probability in 30 days
Top 95% most likely to be exploited
Attack Characteristics
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Published: June 24, 2026 (15 days ago)
Last Modified: June 24, 2026
Vendor: Red Hat
Source: REDHAT

Description

A flaw was found in the Linux kernel's `tun` driver. An unprivileged user can exploit this vulnerability by setting the virtual network (vnet) header size to 24 bytes. This action causes the kernel to copy partially initialized stack memory to userspace when reading non-tunnel packets, leading to the disclosure of 14 bytes of kernel stack memory. This information disclosure could potentially expose sensitive kernel data.

CWE

CWE-909

Affected Products

Red Hat Enterprise Linux 10Red Hat Enterprise Linux 6Red Hat Enterprise Linux 7Red Hat Enterprise Linux 8Red Hat Enterprise Linux 9

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov 🔗 lore.kernel.org