CVE-2026-74378

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix TOCTOU heap overflow in get_srq_wqe get_srq_wqe() reads wqe->dma.num_sge from the shared receive queue buffer, which is mapped into userspace. It validates num_sge against max_sge, but then re-reads the same field to calculate the memcpy size. A concurrent userspace thread can modify num_sge between validation and use, causing a heap buffer overflow when copying the WQE into qp->resp.srq_wqe. Read num_sge into a local variable and use it for both the bounds check and the size calculation.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/02558c86b6b761063e9399e6b939984500327ef1
https://git.kernel.org/stable/c/22b8fbded65b8c441b634a185f8da67657df6c50
https://git.kernel.org/stable/c/3cfa2a3adc51b7c57729961a03446962ff10e3d2
https://git.kernel.org/stable/c/3e07ea9579dc9553d2285c26c2823931358aa3b8
https://git.kernel.org/stable/c/b9800d7953d119bcc068c74587d48e4ba0313629
https://git.kernel.org/stable/c/c8db0e5ab0b6c540214c46c56aaac7cbcb0967fe
https://git.kernel.org/stable/c/cd19a6345e3727adafafa5954b58b13c92e13b80
https://git.kernel.org/stable/c/e48daa94ad2d406225b73491fc935064716f0ec7

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-15 06:22

Updated : 2026-09-14 12:17

NVD link : CVE-2026-74378

Mitre link : CVE-2026-74378

CVE.ORG link : CVE-2026-74378

JSON object : View

Products Affected

No product.

CWE

No CWE.

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It validates num_sge against\nmax_sge, but then re-reads the same field to calculate the memcpy\nsize. A concurrent userspace thread can modify num_sge between\nvalidation and use, causing a heap buffer overflow when copying the\nWQE into qp->resp.srq_wqe.\n\nRead num_sge into a local variable and use it for both the bounds\ncheck and the size calculation."}], "lastModified": "2026-09-14T12:17:45.817", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}