CVE-2024-42084

File truncation via compat offset sign error

Published Jul 29, 2024 · Updated May 11, 2026

Improper input handling in Linux allows local users to truncate writable files to sizes between 2 GiB and 4 GiB. The 32-bit compat ftruncate syscall on 64-bit kernels accepts a negative length without sign-extending it and interprets the value as a large positive offset. Exploitation requires local syscall access and permission to change the target file; native ftruncate and loff_t variants are unaffected.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input handling in Linux allows local users to truncate writable files to sizes between 2 GiB and 4 GiB. The 32-bit compat ftruncate syscall on 64-bit kernels accepts a negative length without sign-extending it and interprets the value as a large positive offset. Exploitation requires local syscall access and permission to change the target file; native ftruncate and loff_t variants are unaffected.

The record

CVE
CVE-2024-42084
Published
Jul 29, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1565.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 29, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=3.9
  2. Affected versionversion=3f6d078d4accfff8b114f968259a060bfdc7c682 <4b8e88e563b5f666446d002ad0dc1e6e8e7102b0
  3. Affected versionversion=3f6d078d4accfff8b114f968259a060bfdc7c682 <5ae6af68410bdad6181ec82104bb9985a7a6a0fa
  4. Affected versionversion=3f6d078d4accfff8b114f968259a060bfdc7c682 <836359247b0403e0634bfbc83e5bb8063fad287a
  5. Affected versionversion=3f6d078d4accfff8b114f968259a060bfdc7c682 <84bf6b64a1a0dfc6de7e1b1c776d58d608e7865a
  6. Affected versionversion=3f6d078d4accfff8b114f968259a060bfdc7c682 <930a4c369f74da26816eaaa71b5888d29b759c27
  7. Affected versionversion=3f6d078d4accfff8b114f968259a060bfdc7c682 <c329760749b5419769e57cb2be80955d2805f9c9
  8. Affected versionversion=3f6d078d4accfff8b114f968259a060bfdc7c682 <dbb226d81cd02cee140139c2369791e6f61f2007
  9. Affected versionversion=3f6d078d4accfff8b114f968259a060bfdc7c682 <f531d4bc6c5588d713359e42ed65e46816d841d8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.9; version=3f6d078d4accfff8b114f968259a060bfdc7c682 <4b8e88e563b5f666446d002ad0dc1e6e8e7102b0; version=3f6d078d4accfff8b114f968259a060bfdc7c682 <5ae6af68410bdad6181ec82104bb9985a7a6a0fa; version=3f6d078d4accfff8b114f968259a060bfdc7c682 <836359247b0403e0634bfbc83e5bb8063fad287a; version=3f6d078d4accfff8b114f968259a060bfdc7c682 <84bf6b64a1a0dfc6de7e1b1c776d58d608e7865a; version=3f6d078d4accfff8b114f968259a060bfdc7c682 <930a4c369f74da26816eaaa71b5888d29b759c27; version=3f6d078d4accfff8b114f968259a060bfdc7c682 <c329760749b5419769e57cb2be80955d2805f9c9; version=3f6d078d4accfff8b114f968259a060bfdc7c682 <dbb226d81cd02cee140139c2369791e6f61f2007; version=3f6d078d4accfff8b114f968259a060bfdc7c682 <f531d4bc6c5588d713359e42ed65e46816d841d8

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
6.3SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
7.2SUSECVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

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

T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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