CVE-2026-43129

Boot crash via unchecked IMA buffer range

Published May 6, 2026 · Updated May 6, 2026

A page-fault flaw in the Linux kernel allows local users to crash an x86_64 kexec boot during IMA measurement restoration. ima_get_kexec_buffer passes the previous kernel's physical IMA buffer to ima_restore_measurement_list without first confirming that the entire range is mapped in the new kernel. The fault requires an x86_64 kexec boot with IMA handoff and a memory-limiting command line that leaves the inherited buffer outside addressable RAM; it interrupts the second-stage boot without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A page-fault flaw in the Linux kernel allows local users to crash an x86_64 kexec boot during IMA measurement restoration. ima_get_kexec_buffer passes the previous kernel's physical IMA buffer to ima_restore_measurement_list without first confirming that the entire range is mapped in the new kernel. The fault requires an x86_64 kexec boot with IMA handoff and a memory-limiting command line that leaves the inherited buffer outside addressable RAM; it interrupts the second-stage boot without reported data disclosure or modification.

The record

CVE
CVE-2026-43129
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <10d1c75ed4382a8e79874379caa2ead8952734f9
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5366ec7d2f793ce703c403d7fd4c25a3db365b9d
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9e1f51c1ad57cc76a0e8b5eb27038f8973fff4fa
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f11d7d088f5ed54b31c6735854c12845eb60eb4a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <10d1c75ed4382a8e79874379caa2ead8952734f9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5366ec7d2f793ce703c403d7fd4c25a3db365b9d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9e1f51c1ad57cc76a0e8b5eb27038f8973fff4fa; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f11d7d088f5ed54b31c6735854c12845eb60eb4a

Published CVSS scores

5.5NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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 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

T1499.004Application or System Exploitation

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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