CVE-2026-45856 (GCVE-0-2026-45856)
Vulnerability from cvelistv5
Published
2026-05-27 12:15
Modified
2026-10-19 19:26
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/uverbs: Validate wqe_size before using it in ib_uverbs_post_send ib_uverbs_post_send() uses cmd.wqe_size from userspace without any validation before passing it to kmalloc() and using the allocated buffer as struct ib_uverbs_send_wr. If a user provides a small wqe_size value (e.g., 1), kmalloc() will succeed, but subsequent accesses to user_wr->opcode, user_wr->num_sge, and other fields will read beyond the allocated buffer, resulting in an out-of-bounds read from kernel heap memory. This could potentially leak sensitive kernel information to userspace. Additionally, providing an excessively large wqe_size can trigger a WARNING in the memory allocation path, as reported by syzkaller. This is inconsistent with ib_uverbs_unmarshall_recv() which properly validates that wqe_size >= sizeof(struct ib_uverbs_recv_wr) before proceeding. Add the same validation for ib_uverbs_post_send() to ensure wqe_size is at least sizeof(struct ib_uverbs_send_wr).
References
Impacted products
Vendor Product Version
Linux Linux Version: c3bea3d2dc5358e05541527283279102383b0231
Version: c3bea3d2dc5358e05541527283279102383b0231
Version: c3bea3d2dc5358e05541527283279102383b0231
Version: c3bea3d2dc5358e05541527283279102383b0231
Version: c3bea3d2dc5358e05541527283279102383b0231
Version: c3bea3d2dc5358e05541527283279102383b0231
Version: c3bea3d2dc5358e05541527283279102383b0231
Version: c3bea3d2dc5358e05541527283279102383b0231
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\"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T15:18:03.663Z\"}, \"title\": \"CISA ADP Vulnrichment\"}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-45856\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"Linux\", \"dateReserved\": \"2026-05-13T15:03:33.079Z\", \"datePublished\": \"2026-05-27T12:15:33.209Z\", \"dateUpdated\": \"2026-10-19T19:26:38.460Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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