CVE-2024-49983

Kernel memory corruption via ext4 path double-free

Published Oct 21, 2024 · Updated Aug 5, 2026

A double-free in Linux kernel ext4 fast-commit replay allows local users to corrupt kernel memory while replaying an extent update. ext4_ext_replay_update_ex passes a copied path pointer to ext4_force_split_extent_at; when ext4_find_extent frees and nulls that copy while growing the extent tree, the caller frees the stale original path again. Reaching the flaw requires local low-privileged access and an extent replay that grows the tree depth; the record does not specify a resulting crash or privilege gain.

CVSS severity7.8
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A double-free in Linux kernel ext4 fast-commit replay allows local users to corrupt kernel memory while replaying an extent update. ext4_ext_replay_update_ex passes a copied path pointer to ext4_force_split_extent_at; when ext4_find_extent frees and nulls that copy while growing the extent tree, the caller frees the stale original path again. Reaching the flaw requires local low-privileged access and an extent replay that grows the tree depth; the record does not specify a resulting crash or privilege gain.

The record

CVE
CVE-2024-49983
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-415
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=5.10
  2. Affected versionversion=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <1b558006d98b7b0b730027be0ee98973dd10ee0d
  3. Affected versionversion=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <3ff710662e8d86a63a39b334e9ca0cb10e5c14b0
  4. Affected versionversion=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95
  5. Affected versionversion=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <6367d3f04c69e2b8770b8137bd800e0784b0abbc
  6. Affected versionversion=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <63adc9016917e6970fb0104ee5fd6770f02b2d80
  7. Affected versionversion=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <8c26d9e53e5fbacda0732a577e97c5a5b7882aaf
  8. Affected versionversion=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <a34bed978364114390162c27e50fca50791c568d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.10; version=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <1b558006d98b7b0b730027be0ee98973dd10ee0d; version=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <3ff710662e8d86a63a39b334e9ca0cb10e5c14b0; version=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <5c0f4cc84d3a601c99bc5e6e6eb1cbda542cce95; version=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <6367d3f04c69e2b8770b8137bd800e0784b0abbc; version=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <63adc9016917e6970fb0104ee5fd6770f02b2d80; version=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <8c26d9e53e5fbacda0732a577e97c5a5b7882aaf; version=8016e29f4362e285f0f7e38fadc61a5b7bdfdfa2 <a34bed978364114390162c27e50fca50791c568d

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

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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-415Double Free

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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