CVE-2024-39477

Local kernel compromise via hugetlb reservation corruption

Published Jul 5, 2024 · Updated Aug 5, 2026

Memory corruption in Linux kernel 6.9 allows local users to read or modify kernel memory through crafted hugetlb mappings. After vma_needs_reservation returns ENOMEM, __unmap_hugepage_range still calls vma_add_reservation, underflowing reservation state and corrupting heap objects. An unprivileged local process can drive the syscall sequence without user interaction, but the host must have a nonzero hugepage pool; outcomes include kernel data exposure, writes, hangs, or panic.

CVSS severity7.8
High
EPSS probability0.19%
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 Linux kernel 6.9 allows local users to read or modify kernel memory through crafted hugetlb mappings. After vma_needs_reservation returns ENOMEM, __unmap_hugepage_range still calls vma_add_reservation, underflowing reservation state and corrupting heap objects. An unprivileged local process can drive the syscall sequence without user interaction, but the host must have a nonzero hugepage pool; outcomes include kernel data exposure, writes, hangs, or panic.

The record

CVE
CVE-2024-39477
Published
Jul 5, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=df7a6d1f64056aec572162c5d35ed9ff86ece6f3 <8daf9c702ee7f825f0de8600abff764acfedea13
  3. Affected versionversion=df7a6d1f64056aec572162c5d35ed9ff86ece6f3 <aa998f9dcb34c28448f86e8f5490f20d5eb0eac7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.9; version=df7a6d1f64056aec572162c5d35ed9ff86ece6f3 <8daf9c702ee7f825f0de8600abff764acfedea13; version=df7a6d1f64056aec572162c5d35ed9ff86ece6f3 <aa998f9dcb34c28448f86e8f5490f20d5eb0eac7

Published CVSS scores

5.5Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8Linux Kernel CVE TeamCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

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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