SB2026081576 - Out-of-bounds write in Linux kernel hw irdma driver

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Main Vulnerability Database SB2026081576

SB2026081576 - Out-of-bounds write in Linux kernel hw irdma driver

Published: August 15, 2026

Security Bulletin ID SB2026081576
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds write (CVE-ID: CVE-2026-74390)

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

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service or execute arbitrary code.

The vulnerability exists due to out-of-bounds write in irdma_copy_user_pgaddrs when processing user-supplied RDMA memory registration data with lvl set to 0. A local user can provide a umem with more DMA blocks than the supplied page count to cause a denial of service or execute arbitrary code.

The issue affects the lvl==0 case that uses the fixed-size iwmr->pgaddrmem array for QP, CQ, and SRQ rings.


Remediation

Install update from vendor's website.

References