Bug 2513477 (CVE-2026-68426) - CVE-2026-68426 kernel: xfrm: fix stale skb->prev after async crypto steals a GSO segment
Summary: CVE-2026-68426 kernel: xfrm: fix stale skb->prev after async crypto steals a ...
Keywords:
Status: NEW
Alias: CVE-2026-68426
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-10 12:39 UTC by OSIDB Bzimport
Modified: 2026-10-14 10:50 UTC (History)
2 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-2026:67471 0 None None None 2026-09-15 06:14:36 UTC
Red Hat Product Errata RHSA-2026:68531 0 None None None 2026-09-17 07:21:01 UTC
Red Hat Product Errata RHSA-2026:68532 0 None None None 2026-09-17 06:57:03 UTC
Red Hat Product Errata RHSA-2026:68570 0 None None None 2026-09-17 12:16:30 UTC
Red Hat Product Errata RHSA-2026:74174 0 None None None 2026-10-01 09:02:08 UTC
Red Hat Product Errata RHSA-2026:75560 0 None None None 2026-10-05 00:36:17 UTC
Red Hat Product Errata RHSA-2026:77216 0 None None None 2026-10-07 02:49:26 UTC
Red Hat Product Errata RHSA-2026:77217 0 None None None 2026-10-07 03:39:11 UTC
Red Hat Product Errata RHSA-2026:77218 0 None None None 2026-10-07 06:27:41 UTC
Red Hat Product Errata RHSA-2026:77301 0 None None None 2026-10-07 07:04:49 UTC
Red Hat Product Errata RHSA-2026:80908 0 None None None 2026-10-12 14:20:46 UTC
Red Hat Product Errata RHSA-2026:82860 0 None None None 2026-10-14 10:50:19 UTC

Description OSIDB Bzimport 2026-08-10 12:39:33 UTC 
In the Linux kernel, the following vulnerability has been resolved:

xfrm: fix stale skb->prev after async crypto steals a GSO segment

skb_gso_segment() leaves the segment list head with ->prev pointing at
the last segment, an invariant validate_xmit_skb_list() relies on when
it sets its tail pointer (tail = skb->prev).

When validate_xmit_xfrm() walks a GSO list and some segments are stolen
by async crypto (->xmit() returns -EINPROGRESS), those segments are
unlinked from the list but the head ->prev is never updated.  If the
last segment is the one stolen, the returned head still has ->prev
pointing at it, even though it is now owned by the crypto engine and may
be freed.  validate_xmit_skb_list() later does tail->next = skb, writing
through that stale pointer -- a use-after-free.

Repoint skb->prev at the last retained segment before returning.
Comment 1 Mauro Matteo Cascella 2026-08-11 08:02:58 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081053-CVE-2026-68426-9cce@gregkh/T
Comment 4 Jon Orris 2026-09-15 06:14:35 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:67471 https://access.redhat.com/errata/RHSA-2026:67471
Comment 5 Jon Orris 2026-09-17 06:57:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:68532 https://access.redhat.com/errata/RHSA-2026:68532
Comment 6 Jon Orris 2026-09-17 07:21:00 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:68531 https://access.redhat.com/errata/RHSA-2026:68531
Comment 7 Jon Orris 2026-09-17 12:16:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:68570 https://access.redhat.com/errata/RHSA-2026:68570
Comment 8 Jon Orris 2026-10-01 09:02:06 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:74174 https://access.redhat.com/errata/RHSA-2026:74174
Comment 9 Jon Orris 2026-10-05 00:36:16 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:75560 https://access.redhat.com/errata/RHSA-2026:75560
Comment 11 Jon Orris 2026-10-07 02:49:25 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-2026:77216 https://access.redhat.com/errata/RHSA-2026:77216
Comment 12 Jon Orris 2026-10-07 03:39:11 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-2026:77217 https://access.redhat.com/errata/RHSA-2026:77217
Comment 13 Jon Orris 2026-10-07 06:27:41 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:77218 https://access.redhat.com/errata/RHSA-2026:77218
Comment 14 Jon Orris 2026-10-07 07:04:48 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-2026:77301 https://access.redhat.com/errata/RHSA-2026:77301
Comment 15 Jon Orris 2026-10-12 14:20:45 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 16 Jon Orris 2026-10-14 10:50:18 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
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