CVE-2026-31774

Kernel memory disclosure and crash via length overflow

Published May 1, 2026 · Updated May 1, 2026

Out-of-bounds read in Linux Kernel 6.10 allows local users to read kernel memory or crash the system through a crafted io_uring request. In io_uring/net.c, an unsigned sqe->len above INT_MAX is stored in signed sr->len, becomes negative, and makes io_bundle_nbufs() advance beyond its allocated iovec array. A local low-privileged user must submit a bundle send or receive request with an oversized length; the kernel-slab read can expose memory and interrupt the system through a crash.

CVSS severity7.1
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 read in Linux Kernel 6.10 allows local users to read kernel memory or crash the system through a crafted io_uring request. In io_uring/net.c, an unsigned sqe->len above INT_MAX is stored in signed sr->len, becomes negative, and makes io_bundle_nbufs() advance beyond its allocated iovec array. A local low-privileged user must submit a bundle send or receive request with an oversized length; the kernel-slab read can expose memory and interrupt the system through a crash.

The record

CVE
CVE-2026-31774
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125
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=6.10
  2. Affected versionversion=a05d1f625c7aa681d8816bc0f10089289ad07aad <1b655cd311344117d3052f6552cb20d9901c9d7c
  3. Affected versionversion=a05d1f625c7aa681d8816bc0f10089289ad07aad <90ced24c500ad4e129e9e34b7e56fd7849e350b6
  4. Affected versionversion=a05d1f625c7aa681d8816bc0f10089289ad07aad <b948f9d5d3057b01188e36664e7c7604d1c8ecb5
  5. Affected versionversion=a05d1f625c7aa681d8816bc0f10089289ad07aad <c314b405dcc4d8b9041124f928f81715d6328bec

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.10; version=a05d1f625c7aa681d8816bc0f10089289ad07aad <1b655cd311344117d3052f6552cb20d9901c9d7c; version=a05d1f625c7aa681d8816bc0f10089289ad07aad <90ced24c500ad4e129e9e34b7e56fd7849e350b6; version=a05d1f625c7aa681d8816bc0f10089289ad07aad <b948f9d5d3057b01188e36664e7c7604d1c8ecb5; version=a05d1f625c7aa681d8816bc0f10089289ad07aad <c314b405dcc4d8b9041124f928f81715d6328bec

Published CVSS scores

7.1kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

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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