CVE-2026-72041: espintcp: use sk_msg_free_partial to fix partial send

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

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

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

espintcp: use sk_msg_free_partial to fix partial send

sk_msg_free_partial() ensures consistency of the skmsg at every
iteration, without having to manually handle uncharges and offsets.
This simplifies the code, and fixes some bugs in skmsg accounting when
we don't send the full contents.

The Linux kernel CVE team has assigned CVE-2026-72041 to this issue.


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

	Issue introduced in 5.6 with commit e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and fixed in 6.6.145 with commit 54d73f18f8919735f4d04d6f43374f75756c0180
	Issue introduced in 5.6 with commit e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and fixed in 6.12.97 with commit 14c0b42c8a2cd9b5361bbff45b52f69c62c6a286
	Issue introduced in 5.6 with commit e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and fixed in 6.18.40 with commit a66d45e0ce6d73cd79962d422388e61bfaf0cb50
	Issue introduced in 5.6 with commit e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and fixed in 7.1.5 with commit a338ce41bc933d8f74c39d9b3b6f1d8ca53d9714
	Issue introduced in 5.6 with commit e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and fixed in 7.2-rc1 with commit 007800408002d871f5699bdb944f985896730b8f

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-2026-72041
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/xfrm/espintcp.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/54d73f18f8919735f4d04d6f43374f75756c0180
	https://git.kernel.org/stable/c/14c0b42c8a2cd9b5361bbff45b52f69c62c6a286
	https://git.kernel.org/stable/c/a66d45e0ce6d73cd79962d422388e61bfaf0cb50
	https://git.kernel.org/stable/c/a338ce41bc933d8f74c39d9b3b6f1d8ca53d9714
	https://git.kernel.org/stable/c/007800408002d871f5699bdb944f985896730b8f