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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-64268 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: bound Read Response placement to the RREAD length In drivers/infiniband/sw/siw/siw_qp_rx.c, siw_proc_rresp() places each inbound Read Response DDP segment at sge->laddr + wqe->processed and then accumulates wqe->processed, but it never checks the running total against the sink buffer length on continuation segments. siw_check_sge() resolves and validates the sink memory only on the first fragment (the if (!*mem) branch), and siw_rresp_check_ntoh() compares the cumulative length against wqe->bytes only on the final segment (the !frx->more_ddp_segs guard). A connected siw peer that answers an outstanding RREAD with Read Response segments that keep the DDP Last flag clear, carrying more total payload than the RREAD requested, drives wqe->processed past the validated sink buffer; the next siw_rx_data() call writes out of bounds at sge->laddr + wqe->processed. siw runs iWARP over ordinary routable TCP, so the peer is the remote end of an established RDMA connection and needs no local privilege. Bound every segment before placement, exactly as siw_proc_send() and siw_proc_write() already do for their tagged and untagged paths, and terminate the connection with a base-or-bounds DDP error when the Read Response would overrun the sink buffer. This is the second receive-path length fix for this file. A separate change rejects an MPA FPDU length that underflows the per-fragment remainder in the header decode; that guard does not cover this case, because here each individual segment length is self-consistent and only the accumulated placement offset overruns the buffer.


Metrics

 
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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/3ef7e052cbd05a8b13a51a07b185a39ec93ee1cf kernel.org
https://git.kernel.org/stable/c/423a78ff7928c2601013f73ec6d896f5597d0df5 kernel.org
https://git.kernel.org/stable/c/595e6537ad1a210da32cbb9a7f91aa73090915ba kernel.org
https://git.kernel.org/stable/c/6bc89f34a4597f9f6d41f7a60c67a3153bfe8851 kernel.org
https://git.kernel.org/stable/c/75c93cd3c421890f49ea93f0b978b9b7bb10e5e3 kernel.org
https://git.kernel.org/stable/c/7d29f7e9dbd844cae4d3e559cf78324b9642fd6b kernel.org
https://git.kernel.org/stable/c/a31b6d18ded3cc32d9ee85a6ff0726d4274887b2 kernel.org
https://git.kernel.org/stable/c/b2e26c955f8dd7e8d3f16c858db05245ea4fa817 kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-64268
NVD Published Date:
07/25/2026
NVD Last Modified:
07/25/2026
Source:
kernel.org