CVE-2026-31743

Kernel memory corruption via undersized DMA buffer

Published May 1, 2026 · Updated May 1, 2026

Out-of-bounds write in the Linux Kernel zynqmp_nvmem driver allows local users to corrupt kernel memory through an eFuse access. In zynqmp_efuse_access, dma_alloc_coherent allocates sizeof(bytes) rather than bytes, while memcpy copies the full requested length into that undersized DMA buffer. Exploitation requires low-privileged local access and a system using the ZynqMP eFuse NVMEM driver; successful corruption can disclose or alter kernel memory or interrupt the system.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in the Linux Kernel zynqmp_nvmem driver allows local users to corrupt kernel memory through an eFuse access. In zynqmp_efuse_access, dma_alloc_coherent allocates sizeof(bytes) rather than bytes, while memcpy copies the full requested length into that undersized DMA buffer. Exploitation requires low-privileged local access and a system using the ZynqMP eFuse NVMEM driver; successful corruption can disclose or alter kernel memory or interrupt the system.

The record

CVE
CVE-2026-31743
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 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=6.9
  2. Affected versionversion=737c0c8d07b5f671c0a33cec95965fcb2d2ea893 <2f6e5b9964d0a63a5ba84fca2642876afb70a662
  3. Affected versionversion=737c0c8d07b5f671c0a33cec95965fcb2d2ea893 <6c01e7f11f5e5f22285d19510a9643e2506e13c3
  4. Affected versionversion=737c0c8d07b5f671c0a33cec95965fcb2d2ea893 <784ed4abded1ca4b525fa4cade8b02f8c5d2a087
  5. Affected versionversion=737c0c8d07b5f671c0a33cec95965fcb2d2ea893 <f9b88613ff402aa6fe8fd020573cb95867ae947e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.9; version=737c0c8d07b5f671c0a33cec95965fcb2d2ea893 <2f6e5b9964d0a63a5ba84fca2642876afb70a662; version=737c0c8d07b5f671c0a33cec95965fcb2d2ea893 <6c01e7f11f5e5f22285d19510a9643e2506e13c3; version=737c0c8d07b5f671c0a33cec95965fcb2d2ea893 <784ed4abded1ca4b525fa4cade8b02f8c5d2a087; version=737c0c8d07b5f671c0a33cec95965fcb2d2ea893 <f9b88613ff402aa6fe8fd020573cb95867ae947e

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/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-787Out-of-bounds Write
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

See the directory against your own environment.

Your stack

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