Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2026-64004

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: net/iucv: fix locking in .getsockopt Mirror iucv_sock_setsockopt() and wrap the whole switch in lock_sock()/release_sock().

Published Jul 19, 2026EPSS 0.10%

Overview

CVE-2026-64004 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

net/iucv: fix locking in .getsockopt

Mirror iucv_sock_setsockopt() and wrap the whole switch in

lock_sock()/release_sock(). The pre-existing SO_MSGLIMIT-only lock

becomes redundant and is removed.

Any AF_IUCV HIPER user can potentially crash the kernel by racing

recvmsg() with getsockopt(SO_MSGSIZE): the SO_MSGSIZE arm dereferences

iucv->hs_dev->mtu after iucv_sock_close() (called from the racing

recvmsg()) has set hs_dev to NULL, producing a NULL pointer dereference

oops.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1fc30bd4e55e2dd622d2d366cecd732c1841bbeeRefgit.kernel.org/stable/c/3589d20a666caf30ad100c960a2de7de390fce88Refgit.kernel.org/stable/c/45bb8de8c95d8899f4b8f61bd9bceb8132af73cbRefgit.kernel.org/stable/c/69554adc7a6fa04ede3ad7512321d83748e3c920Refgit.kernel.org/stable/c/6e792b8dd3002bbc4136745928a9605df1a72b8aRefgit.kernel.org/stable/c/884eb247b74d86db97e3a37f0d6fc8e1e83590ddRefgit.kernel.org/stable/c/9817369243380e287ebe5525411557eaa3aa2a79Refgit.kernel.org/stable/c/cd691beafea0dd779e69e81ccc26b0ab50efcb5e

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64004?

CVE-2026-64004 is a high-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-64004?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-64004?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-64004?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64004 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2026

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999