CVE-2026-46029

Kernel memory corruption via NMI allocator reentry

Published May 27, 2026 · Updated May 27, 2026

Memory corruption in affected Linux Kernel builds allows local users to corrupt slab state through an NMI-context allocation. On uniprocessor builds, kmalloc_nolock reenters SLUB and takes n->list_lock because spin_trylock succeeds while the interrupted context already holds it. Exploitation requires local low-privileged access, high-complexity timing, and CONFIG_SMP disabled; the resulting corruption can trigger a kernel BUG.

CVSS severity7.0
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in affected Linux Kernel builds allows local users to corrupt slab state through an NMI-context allocation. On uniprocessor builds, kmalloc_nolock reenters SLUB and takes n->list_lock because spin_trylock succeeds while the interrupted context already holds it. Exploitation requires local low-privileged access, high-complexity timing, and CONFIG_SMP disabled; the resulting corruption can trigger a kernel BUG.

The record

CVE
CVE-2026-46029
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.18
  2. Affected versionversion=af92793e52c3a99b828ed4bdd277fd3e11c18d08 <5b31044e649e3e54c2caef135c09b371c2fbcd08
  3. Affected versionversion=af92793e52c3a99b828ed4bdd277fd3e11c18d08 <a8d95d274be241ad21f6523bf2d6ba0d7d7e46b7
  4. Affected versionversion=af92793e52c3a99b828ed4bdd277fd3e11c18d08 <d66553204a15bdb257d9ef8aca1e12f5fbb910b2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.18; version=af92793e52c3a99b828ed4bdd277fd3e11c18d08 <5b31044e649e3e54c2caef135c09b371c2fbcd08; version=af92793e52c3a99b828ed4bdd277fd3e11c18d08 <a8d95d274be241ad21f6523bf2d6ba0d7d7e46b7; version=af92793e52c3a99b828ed4bdd277fd3e11c18d08 <d66553204a15bdb257d9ef8aca1e12f5fbb910b2

Published CVSS scores

7.0kernel.orgCVSS: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

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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