CVE-2026-74378

Kernel memory corruption via raced WQE size

Published Aug 15, 2026 · Updated Aug 15, 2026

Heap buffer overflow in the Linux kernel RDMA/rxe driver allows local users to corrupt kernel memory through a shared receive queue. The get_srq_wqe function validates wqe->dma.num_sge from a userspace-mapped SRQ buffer, then rereads the mutable field to size a memcpy into qp->resp.srq_wqe. A low-privileged local process that races the WQE update can overwrite kernel heap memory, leading to a crash or arbitrary code execution.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in the Linux kernel RDMA/rxe driver allows local users to corrupt kernel memory through a shared receive queue. The get_srq_wqe function validates wqe->dma.num_sge from a userspace-mapped SRQ buffer, then rereads the mutable field to size a memcpy into qp->resp.srq_wqe. A low-privileged local process that races the WQE update can overwrite kernel heap memory, leading to a crash or arbitrary code execution.

The record

CVE
CVE-2026-74378
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-131, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.8
  2. Affected versionversion=8700e3e7c4857d28ebaa824509934556da0b3e76 <02558c86b6b761063e9399e6b939984500327ef1
  3. Affected versionversion=8700e3e7c4857d28ebaa824509934556da0b3e76 <22b8fbded65b8c441b634a185f8da67657df6c50
  4. Affected versionversion=8700e3e7c4857d28ebaa824509934556da0b3e76 <3cfa2a3adc51b7c57729961a03446962ff10e3d2
  5. Affected versionversion=8700e3e7c4857d28ebaa824509934556da0b3e76 <3e07ea9579dc9553d2285c26c2823931358aa3b8
  6. Affected versionversion=8700e3e7c4857d28ebaa824509934556da0b3e76 <b9800d7953d119bcc068c74587d48e4ba0313629
  7. Affected versionversion=8700e3e7c4857d28ebaa824509934556da0b3e76 <cd19a6345e3727adafafa5954b58b13c92e13b80

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.8; version=8700e3e7c4857d28ebaa824509934556da0b3e76 <02558c86b6b761063e9399e6b939984500327ef1; version=8700e3e7c4857d28ebaa824509934556da0b3e76 <22b8fbded65b8c441b634a185f8da67657df6c50; version=8700e3e7c4857d28ebaa824509934556da0b3e76 <3cfa2a3adc51b7c57729961a03446962ff10e3d2; version=8700e3e7c4857d28ebaa824509934556da0b3e76 <3e07ea9579dc9553d2285c26c2823931358aa3b8; version=8700e3e7c4857d28ebaa824509934556da0b3e76 <b9800d7953d119bcc068c74587d48e4ba0313629; version=8700e3e7c4857d28ebaa824509934556da0b3e76 <cd19a6345e3727adafafa5954b58b13c92e13b80

Published CVSS scores

7.0SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.3SUSECVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-131Incorrect Calculation of Buffer Size
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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