Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

Go to Calendar     Go to Press Room     Go to Newsletters subscription

Search

CVE-2026-64004

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
19/07/2026
Last modified:
20/07/2026

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net/iucv: fix locking in .getsockopt<br /> <br /> Mirror iucv_sock_setsockopt() and wrap the whole switch in<br /> lock_sock()/release_sock(). The pre-existing SO_MSGLIMIT-only lock<br /> becomes redundant and is removed.<br /> <br /> Any AF_IUCV HIPER user can potentially crash the kernel by racing<br /> recvmsg() with getsockopt(SO_MSGSIZE): the SO_MSGSIZE arm dereferences<br /> iucv-&gt;hs_dev-&gt;mtu after iucv_sock_close() (called from the racing<br /> recvmsg()) has set hs_dev to NULL, producing a NULL pointer dereference<br /> oops.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
7.80
Severity 3.x
HIGH

References to Advisories, Solutions, and Tools