CVE-2026-68477: ipvs: fix more places with wrong ipv6 transport offsets

From: Greg Kroah-Hartman <[email protected]>

Description
===========

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

ipvs: fix more places with wrong ipv6 transport offsets

Sashiko reports for more incorrect IPv6 transport offsets.

The app code for TCP was assuming IPv4 network header
even after the ipvsh argument was provided. This can
cause problems with apps over IPv6. As for the only
official app in the kernel tree (FTP) this problem is
harmless because we use Netfilter to mangle the FTP
ports and we do not adjust the TCP seq numbers.

Also, provide correct offset of the ICMPV6 header in
ip_vs_out_icmp_v6() for correct checksum checks when
the IPv6 packet has extension headers.

The Linux kernel CVE team has assigned CVE-2026-68477 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 2.6.28 with commit 2a3b791e6e1169f374224d164738e9f7be703d77 and fixed in 5.10.261 with commit 613ce63711b8d431bba90781f133c39a21684f87
	Issue introduced in 2.6.28 with commit 2a3b791e6e1169f374224d164738e9f7be703d77 and fixed in 5.15.212 with commit 95d4511d81b2b37e5d2bdde5d912e48243eae517
	Issue introduced in 2.6.28 with commit 2a3b791e6e1169f374224d164738e9f7be703d77 and fixed in 6.1.178 with commit 3a9dc9b55b53d94613a587604b77d3b20024090c
	Issue introduced in 2.6.28 with commit 2a3b791e6e1169f374224d164738e9f7be703d77 and fixed in 6.6.145 with commit a3f0d5b605cd5da5c95279969fb8cea4e55cee5b
	Issue introduced in 2.6.28 with commit 2a3b791e6e1169f374224d164738e9f7be703d77 and fixed in 6.12.97 with commit 7350eb7ead172ae8024897d4b0f2e15c5318279c
	Issue introduced in 2.6.28 with commit 2a3b791e6e1169f374224d164738e9f7be703d77 and fixed in 6.18.40 with commit d4ec18f48ce78a3bf7c999ac908691007375fe99
	Issue introduced in 2.6.28 with commit 2a3b791e6e1169f374224d164738e9f7be703d77 and fixed in 7.1.5 with commit 905d7a363ade96a19f214815361e11981142c547
	Issue introduced in 2.6.28 with commit 2a3b791e6e1169f374224d164738e9f7be703d77 and fixed in 7.2-rc4 with commit b3fe4cbd583895987935a9bdad01c8f9d3a02310

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-68477
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	net/netfilter/ipvs/ip_vs_app.c
	net/netfilter/ipvs/ip_vs_core.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/613ce63711b8d431bba90781f133c39a21684f87
	https://git.kernel.org/stable/c/95d4511d81b2b37e5d2bdde5d912e48243eae517
	https://git.kernel.org/stable/c/3a9dc9b55b53d94613a587604b77d3b20024090c
	https://git.kernel.org/stable/c/a3f0d5b605cd5da5c95279969fb8cea4e55cee5b
	https://git.kernel.org/stable/c/7350eb7ead172ae8024897d4b0f2e15c5318279c
	https://git.kernel.org/stable/c/d4ec18f48ce78a3bf7c999ac908691007375fe99
	https://git.kernel.org/stable/c/905d7a363ade96a19f214815361e11981142c547
	https://git.kernel.org/stable/c/b3fe4cbd583895987935a9bdad01c8f9d3a02310