SB20260727302 - Out-of-bounds write in Linux kernel sw siw driver

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Main Vulnerability Database SB20260727302

SB20260727302 - Out-of-bounds write in Linux kernel sw siw driver

Published: July 27, 2026

Security Bulletin ID SB20260727302
CSH Severity
High
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

High 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds write (CVE-ID: CVE-2026-64268)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 7.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote user to write out of bounds.

The vulnerability exists due to an out-of-bounds write in siw_proc_rresp() in drivers/infiniband/sw/siw/siw_qp_rx.c when processing Read Response DDP segments for an outstanding RREAD over an established RDMA connection. A remote user can send Read Response segments with more total payload than requested while keeping the DDP Last flag clear to write out of bounds.

Exploitation requires a connected siw peer on an established RDMA connection over routable TCP.


Remediation

Install update from vendor's website.

References