Bug 2393507 (CVE-2025-39718)

Summary:	CVE-2025-39718 kernel: vsock/virtio: Validate length in packet header before skb_put()
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	Keywords:	Security
Target Milestone:	---
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Hardware:	All
OS:	Linux
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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Description OSIDB Bzimport 2025-09-05 18:03:01 UTC

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

vsock/virtio: Validate length in packet header before skb_put()

When receiving a vsock packet in the guest, only the virtqueue buffer
size is validated prior to virtio_vsock_skb_rx_put(). Unfortunately,
virtio_vsock_skb_rx_put() uses the length from the packet header as the
length argument to skb_put(), potentially resulting in SKB overflow if
the host has gone wonky.

Validate the length as advertised by the packet header before calling
virtio_vsock_skb_rx_put().

Comment 1 Jon Moroney 2025-09-05 21:40:57 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025090551-CVE-2025-39718-2e2c@gregkh/T

Comment 5 errata-xmlrpc 2025-10-27 16:19:23 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2025:19104 https://access.redhat.com/errata/RHSA-2025:19104

Comment 6 errata-xmlrpc 2025-10-27 18:31:37 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2025:19106 https://access.redhat.com/errata/RHSA-2025:19106

Comment 7 errata-xmlrpc 2025-10-27 19:34:09 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:19105 https://access.redhat.com/errata/RHSA-2025:19105

Comment 8 errata-xmlrpc 2025-11-12 11:25:11 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:21112 https://access.redhat.com/errata/RHSA-2025:21112

Comment 9 errata-xmlrpc 2025-11-12 12:22:09 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2025:21118 https://access.redhat.com/errata/RHSA-2025:21118

Comment 10 errata-xmlrpc 2025-11-17 00:35:58 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2025:21397 https://access.redhat.com/errata/RHSA-2025:21397

Comment 11 errata-xmlrpc 2025-11-17 00:45:22 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2025:21398 https://access.redhat.com/errata/RHSA-2025:21398