CVE-2024-49884

Kernel memory corruption via stale ext4 extent path

Published Oct 21, 2024 · Updated Aug 5, 2026

Use-after-free in the ext4 extent-splitting path in Linux allows local users to corrupt kernel memory through ordinary file I/O. The ext4_split_extent_at function retains a stale path after ext4_find_extent frees it and nulls the caller's path pointer on an allocation or I/O error, then dereferences the freed path. A local low-privileged user with write access to an ext4 file can trigger writeback and cause kernel memory disclosure, corruption, or a panic without user interaction.

CVSS severity7.8
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the ext4 extent-splitting path in Linux allows local users to corrupt kernel memory through ordinary file I/O. The ext4_split_extent_at function retains a stale path after ext4_find_extent frees it and nulls the caller's path pointer on an allocation or I/O error, then dereferences the freed path. A local low-privileged user with write access to an ext4 file can trigger writeback and cause kernel memory disclosure, corruption, or a panic without user interaction.

The record

CVE
CVE-2024-49884
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 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=3.18
  2. Affected versionversion=dfe5080939ea4686b3414b5d970a9b26733c57a4 <393a46f60ea4f249dc9d496d4eb2d542f5e11ade
  3. Affected versionversion=dfe5080939ea4686b3414b5d970a9b26733c57a4 <448100a29395b0c8b4c42967155849fe0fbe808f
  4. Affected versionversion=dfe5080939ea4686b3414b5d970a9b26733c57a4 <5d949ea75bb529ea6342e83465938a3b0ac51238
  5. Affected versionversion=dfe5080939ea4686b3414b5d970a9b26733c57a4 <8fe117790b37c84c651e2bad9efc0e7fda73c0e3
  6. Affected versionversion=dfe5080939ea4686b3414b5d970a9b26733c57a4 <915ac3630488af0ca194dc63b86d99802b4f6e18
  7. Affected versionversion=dfe5080939ea4686b3414b5d970a9b26733c57a4 <a5401d4c3e2a3d25643c567d26e6de327774a2c9
  8. Affected versionversion=dfe5080939ea4686b3414b5d970a9b26733c57a4 <c26ab35702f8cd0cdc78f96aa5856bfb77be798f
  9. Affected versionversion=dfe5080939ea4686b3414b5d970a9b26733c57a4 <cafcc1bd62934547c76abf46c6d0d54f135006fe
  10. Affected versionversion=dfe5080939ea4686b3414b5d970a9b26733c57a4 <e52f933598b781d291b9297e39c463536da0e185

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.18; version=dfe5080939ea4686b3414b5d970a9b26733c57a4 <393a46f60ea4f249dc9d496d4eb2d542f5e11ade; version=dfe5080939ea4686b3414b5d970a9b26733c57a4 <448100a29395b0c8b4c42967155849fe0fbe808f; version=dfe5080939ea4686b3414b5d970a9b26733c57a4 <5d949ea75bb529ea6342e83465938a3b0ac51238; version=dfe5080939ea4686b3414b5d970a9b26733c57a4 <8fe117790b37c84c651e2bad9efc0e7fda73c0e3; version=dfe5080939ea4686b3414b5d970a9b26733c57a4 <915ac3630488af0ca194dc63b86d99802b4f6e18; version=dfe5080939ea4686b3414b5d970a9b26733c57a4 <a5401d4c3e2a3d25643c567d26e6de327774a2c9; version=dfe5080939ea4686b3414b5d970a9b26733c57a4 <c26ab35702f8cd0cdc78f96aa5856bfb77be798f; version=dfe5080939ea4686b3414b5d970a9b26733c57a4 <cafcc1bd62934547c76abf46c6d0d54f135006fe; version=dfe5080939ea4686b3414b5d970a9b26733c57a4 <e52f933598b781d291b9297e39c463536da0e185

Published CVSS scores

7.8Linux kernel CNACVSS: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.

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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

CWE-416Use After Free
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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