CVE-2026-98323: RDMA/siw: Bound fragmented header copies by the remaining length

CVE-2026-98323: RDMA/siw: Bound fragmented header copies by the remaining length

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

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

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

RDMA/siw: Bound fragmented header copies by the remaining length

siw_get_hdr() can receive an extended DDP/RDMAP header across more than
one TCP callback. The first callback may receive most of the header,
while the next one still limits the copy to hdrlen - MIN_DDP_HDR instead
of the number of missing bytes. This makes the destination move past the
end of the header and overwrite the receive state, including
fpdu_part_rcvd. A later callback can then use a negative fpdu_part_rcvd
value as a copy offset, which creates an OOB write.

Use the number of header bytes already received when calculating the
next copy length.

The Linux kernel CVE team has assigned CVE-2026-98323 to this issue.


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

	Issue introduced in 5.10.150 with commit e3917c85f41ef1df64e27dc0e46ab0d803c5e73e and fixed in 5.10.271 with commit 2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7
	Issue introduced in 5.15.75 with commit 308cd50f174c95a507527037f4de1a0396aa4325 and fixed in 5.15.222 with commit af9f5b474a260ad23ffb9793d716a5e3bbce3b48
	Issue introduced in 6.1 with commit 754209850df8367c954ac1de7671c7430b1f342c and fixed in 6.1.189 with commit 262dcd809723723ed8a4e05437ec7e9c21a8f17e
	Issue introduced in 6.1 with commit 754209850df8367c954ac1de7671c7430b1f342c and fixed in 6.6.158 with commit eb4d7a946970469b3ab0c762432bf161d5b0836c
	Issue introduced in 6.1 with commit 754209850df8367c954ac1de7671c7430b1f342c and fixed in 6.12.112 with commit 8628f8ebf41669302513fb3f0bf0eba38b226742
	Issue introduced in 6.1 with commit 754209850df8367c954ac1de7671c7430b1f342c and fixed in 6.18.54 with commit b72dcfb9bf1f0f0147cda03dc59e4002a315067f
	Issue introduced in 6.1 with commit 754209850df8367c954ac1de7671c7430b1f342c and fixed in 7.2.8 with commit e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9d
	Issue introduced in 6.1 with commit 754209850df8367c954ac1de7671c7430b1f342c and fixed in 7.3-rc4 with commit 9ff797e516dbc1ecb73701ec4c24055712d44411
	Issue introduced in 5.4.220 with commit e09caa38e10bcf027100cc22b0e3cc745a39ef0a
	Issue introduced in 5.19.17 with commit 0c14f795a9eab9344230f9933798b8ee496f497d
	Issue introduced in 6.0.3 with commit 7fada7c6962219b6fc4ff4e62e46a936af110dd9

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-2026-98323
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:
	drivers/infiniband/sw/siw/siw_qp_rx.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/2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7
	https://git.kernel.org/stable/c/af9f5b474a260ad23ffb9793d716a5e3bbce3b48
	https://git.kernel.org/stable/c/262dcd809723723ed8a4e05437ec7e9c21a8f17e
	https://git.kernel.org/stable/c/eb4d7a946970469b3ab0c762432bf161d5b0836c
	https://git.kernel.org/stable/c/8628f8ebf41669302513fb3f0bf0eba38b226742
	https://git.kernel.org/stable/c/b72dcfb9bf1f0f0147cda03dc59e4002a315067f
	https://git.kernel.org/stable/c/e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9d
	https://git.kernel.org/stable/c/9ff797e516dbc1ecb73701ec4c24055712d44411