Bug 2521498 (CVE-2026-74705) - CVE-2026-74705 kernel: udp: fix potential use-after-free in tunnel segmentation
Summary: CVE-2026-74705 kernel: udp: fix potential use-after-free in tunnel segmentation
Keywords:
Status: NEW
Alias: CVE-2026-74705
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-22 15:48 UTC by OSIDB Bzimport
Modified: 2026-11-12 17:42 UTC (History)
18 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:77634 0 None None None 2026-10-07 15:42:30 UTC
Red Hat Product Errata RHSA-2026:77690 0 None None None 2026-10-08 09:52:28 UTC
Red Hat Product Errata RHSA-2026:79778 0 None None None 2026-10-09 07:12:54 UTC
Red Hat Product Errata RHSA-2026:79782 0 None None None 2026-10-09 09:03:37 UTC
Red Hat Product Errata RHSA-2026:79783 0 None None None 2026-10-09 08:58:07 UTC
Red Hat Product Errata RHSA-2026:79784 0 None None None 2026-10-09 10:48:52 UTC
Red Hat Product Errata RHSA-2026:79786 0 None None None 2026-10-09 13:27:28 UTC
Red Hat Product Errata RHSA-2026:80908 0 None None None 2026-10-12 14:20:48 UTC
Red Hat Product Errata RHSA-2026:81349 0 None None None 2026-10-12 16:31:02 UTC
Red Hat Product Errata RHSA-2026:81371 0 None None None 2026-10-12 16:01:22 UTC
Red Hat Product Errata RHSA-2026:82860 0 None None None 2026-10-14 10:50:26 UTC
Red Hat Product Errata RHSA-2026:83156 0 None None None 2026-10-14 21:23:22 UTC
Red Hat Product Errata RHSA-2026:83157 0 None None None 2026-10-14 21:10:09 UTC
Red Hat Product Errata RHSA-2026:83159 0 None None None 2026-10-14 21:11:43 UTC
Red Hat Product Errata RHSA-2026:95587 0 None None None 2026-11-05 16:36:20 UTC
Red Hat Product Errata RHSA-2026:95600 0 None None None 2026-11-05 17:20:41 UTC
Red Hat Product Errata RHSA-2026:95601 0 None None None 2026-11-05 17:22:58 UTC
Red Hat Product Errata RHSA-2026:96090 0 None None None 2026-11-09 02:48:24 UTC
Red Hat Product Errata RHSA-2026:96091 0 None None None 2026-11-09 02:51:00 UTC
Red Hat Product Errata RHSA-2026:96093 0 None None None 2026-11-09 02:39:37 UTC
Red Hat Product Errata RHSA-2026:97873 0 None None None 2026-11-10 22:14:24 UTC
Red Hat Product Errata RHSA-2026:98608 0 None None None 2026-11-11 11:32:01 UTC
Red Hat Product Errata RHSA-2026:99722 0 None None None 2026-11-12 17:42:40 UTC

Description OSIDB Bzimport 2026-08-22 15:48:29 UTC 
In the Linux kernel, the following vulnerability has been resolved:

udp: fix potential use-after-free in tunnel segmentation

__skb_udp_tunnel_segment() gets the UDP header before ensuring the
tunnel header is in the skb head. If the pull reallocates skb->head,
the saved UDP header pointer is no longer valid.

Get the UDP header after the pull to avoid a potential use-after-free.
Comment 1 gkamathe 2026-08-24 13:29:35 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082236-CVE-2026-74705-49e4@gregkh/T
Comment 7 Jon Orris 2026-10-07 15:42:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:77634 https://access.redhat.com/errata/RHSA-2026:77634
Comment 8 Jon Orris 2026-10-08 09:52:26 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:77690 https://access.redhat.com/errata/RHSA-2026:77690
Comment 9 Jon Orris 2026-10-09 07:12:52 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:79778 https://access.redhat.com/errata/RHSA-2026:79778
Comment 10 Jon Orris 2026-10-09 08:58:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:79783 https://access.redhat.com/errata/RHSA-2026:79783
Comment 11 Jon Orris 2026-10-09 09:03:35 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:79782 https://access.redhat.com/errata/RHSA-2026:79782
Comment 12 Jon Orris 2026-10-09 10:48:50 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:79784 https://access.redhat.com/errata/RHSA-2026:79784
Comment 13 Jon Orris 2026-10-09 13:27:26 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:79786 https://access.redhat.com/errata/RHSA-2026:79786
Comment 14 Jon Orris 2026-10-12 14:20:46 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:80908 https://access.redhat.com/errata/RHSA-2026:80908
Comment 15 Jon Orris 2026-10-12 16:01:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:81371 https://access.redhat.com/errata/RHSA-2026:81371
Comment 16 Jon Orris 2026-10-12 16:31:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:81349 https://access.redhat.com/errata/RHSA-2026:81349
Comment 17 Jon Orris 2026-10-14 10:50:24 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:82860 https://access.redhat.com/errata/RHSA-2026:82860
Comment 18 Jon Orris 2026-10-14 21:10:07 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:83157 https://access.redhat.com/errata/RHSA-2026:83157
Comment 19 Jon Orris 2026-10-14 21:11:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:83159 https://access.redhat.com/errata/RHSA-2026:83159
Comment 20 Jon Orris 2026-10-14 21:23:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:83156 https://access.redhat.com/errata/RHSA-2026:83156
Comment 22 Jon Orris 2026-11-05 16:36:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:95587 https://access.redhat.com/errata/RHSA-2026:95587
Comment 23 Jon Orris 2026-11-05 17:20:40 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:95600 https://access.redhat.com/errata/RHSA-2026:95600
Comment 24 Jon Orris 2026-11-05 17:22:56 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

Via RHSA-2026:95601 https://access.redhat.com/errata/RHSA-2026:95601
Comment 25 errata-xmlrpc 2026-11-09 02:39:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:96093 https://access.redhat.com/errata/RHSA-2026:96093
Comment 26 errata-xmlrpc 2026-11-09 02:48:23 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:96090 https://access.redhat.com/errata/RHSA-2026:96090
Comment 27 errata-xmlrpc 2026-11-09 02:50:58 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:96091 https://access.redhat.com/errata/RHSA-2026:96091
Comment 28 errata-xmlrpc 2026-11-10 22:14:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:97873 https://access.redhat.com/errata/RHSA-2026:97873
Comment 29 errata-xmlrpc 2026-11-11 11:31:58 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:98608 https://access.redhat.com/errata/RHSA-2026:98608
Comment 30 errata-xmlrpc 2026-11-12 17:42:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.2 Extended Update Support

Via RHSA-2026:99722 https://access.redhat.com/errata/RHSA-2026:99722
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