Bug 2516251 (CVE-2026-68476)

Summary:	CVE-2026-68476 kernel: ipvs: reload ip header after head reallocation
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's IP Virtual Server (IPVS) module. When processing network packets, a buffer reallocation can leave an IP header pointer referencing freed memory. An attacker could exploit this use-after-free condition to cause a Denial of Service (DoS) by crashing the system or potentially corrupt system memory.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-08-15 06:02:44 UTC

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

ipvs: reload ip header after head reallocation

__ip_vs_get_out_rt() calls skb_ensure_writable() which may
reallocate skb->head.

Comment 1 Keith Grant 2026-08-17 14:38:11 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081505-CVE-2026-68476-47ba@gregkh/T

Comment 5 Jon Orris 2026-10-07 20:29:04 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:76738 https://access.redhat.com/errata/RHSA-2026:76738

Comment 6 Jon Orris 2026-10-24 16:39:32 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:89082 https://access.redhat.com/errata/RHSA-2026:89082

Comment 7 Jon Orris 2026-10-24 16:48:44 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:89083 https://access.redhat.com/errata/RHSA-2026:89083

Comment 8 Jon Orris 2026-10-26 21:02:47 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:90365 https://access.redhat.com/errata/RHSA-2026:90365

Comment 9 Jon Orris 2026-11-03 15:40:49 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-2026:94596 https://access.redhat.com/errata/RHSA-2026:94596

Comment 10 Jon Orris 2026-11-04 04:44:18 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-2026:94996 https://access.redhat.com/errata/RHSA-2026:94996