Bug 2492270 (CVE-2026-53091) - CVE-2026-53091 kernel: net: pull headers in qdisc_pkt_len_segs_init()
Summary: CVE-2026-53091 kernel: net: pull headers in qdisc_pkt_len_segs_init()
Keywords:
Status: NEW
Alias: CVE-2026-53091
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: 2026-06-24 18:02 UTC by OSIDB Bzimport
Modified: 2026-10-01 09:01 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-2026:65334 0 None None None 2026-09-08 11:35:09 UTC
Red Hat Product Errata RHSA-2026:66324 0 None None None 2026-09-10 05:18:37 UTC
Red Hat Product Errata RHSA-2026:66325 0 None None None 2026-09-10 05:39:55 UTC
Red Hat Product Errata RHSA-2026:67150 0 None None None 2026-09-14 13:35:56 UTC
Red Hat Product Errata RHSA-2026:73645 0 None None None 2026-09-30 00:46:09 UTC
Red Hat Product Errata RHSA-2026:74174 0 None None None 2026-10-01 09:01:36 UTC

Description OSIDB Bzimport 2026-06-24 18:02:03 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: pull headers in qdisc_pkt_len_segs_init()

Most ndo_start_xmit() methods expects headers of gso packets
to be already in skb->head.

net/core/tso.c users are particularly at risk, because tso_build_hdr()
does a memcpy(hdr, skb->data, hdr_len);

qdisc_pkt_len_segs_init() already does a dissection of gso packets.

Use pskb_may_pull() instead of skb_header_pointer() to make
sure drivers do not have to reimplement this.

Some malicious packets could be fed, detect them so that we can
drop them sooner with a new SKB_DROP_REASON_SKB_BAD_GSO drop_reason.
Comment 1 Mauro Matteo Cascella 2026-06-24 19:14:11 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062409-CVE-2026-53091-cb58@gregkh/T
Comment 4 errata-xmlrpc 2026-09-08 11:35:08 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:65334 https://access.redhat.com/errata/RHSA-2026:65334
Comment 5 errata-xmlrpc 2026-09-10 05:18:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:66324 https://access.redhat.com/errata/RHSA-2026:66324
Comment 6 errata-xmlrpc 2026-09-10 05:39:54 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:66325 https://access.redhat.com/errata/RHSA-2026:66325
Comment 7 Jon Orris 2026-09-14 13:35:55 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:67150 https://access.redhat.com/errata/RHSA-2026:67150
Comment 9 Jon Orris 2026-09-30 00:46:08 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:73645 https://access.redhat.com/errata/RHSA-2026:73645
Comment 10 Jon Orris 2026-10-01 09:01:35 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
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