CVE-2024-47741

Kernel memory leak and use-after-free via concurrent lseek

Published Oct 21, 2024 · Updated Aug 5, 2026

A race condition in the Linux btrfs implementation allows local users to leak kernel memory via concurrent lseek calls. In find_desired_extent(), threads sharing one file descriptor can both observe a null private_data pointer, allocate separate private structures, and overwrite the same pointer. The trigger requires SEEK_DATA or SEEK_HOLE calls from the same process; shared cached state can subsequently be freed while another thread still uses it.

CVSS severity7.0
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in the Linux btrfs implementation allows local users to leak kernel memory via concurrent lseek calls. In find_desired_extent(), threads sharing one file descriptor can both observe a null private_data pointer, allocate separate private structures, and overwrite the same pointer. The trigger requires SEEK_DATA or SEEK_HOLE calls from the same process; shared cached state can subsequently be freed while another thread still uses it.

The record

CVE
CVE-2024-47741
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362
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=3c32c7212f1639471ec0197ff1179b8ef2e0f3d3 <33d1310d4496e904123dab9c28b2d8d2c1800f97
  2. Affected versionversion=3c32c7212f1639471ec0197ff1179b8ef2e0f3d3 <7ee85f5515e86a4e2a2f51969795920733912bad
  3. Affected versionversion=3c32c7212f1639471ec0197ff1179b8ef2e0f3d3 <a412ca489ac27b9d0e603499315b7139c948130d
  4. Affected versionversion=3c32c7212f1639471ec0197ff1179b8ef2e0f3d3 <f56a6d9c267ec7fa558ede7755551c047b1034cd
  5. Affected versionversion=6.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3c32c7212f1639471ec0197ff1179b8ef2e0f3d3 <33d1310d4496e904123dab9c28b2d8d2c1800f97; version=3c32c7212f1639471ec0197ff1179b8ef2e0f3d3 <7ee85f5515e86a4e2a2f51969795920733912bad; version=3c32c7212f1639471ec0197ff1179b8ef2e0f3d3 <a412ca489ac27b9d0e603499315b7139c948130d; version=3c32c7212f1639471ec0197ff1179b8ef2e0f3d3 <f56a6d9c267ec7fa558ede7755551c047b1034cd; version=6.2

Published CVSS scores

7.0CanonicalCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0NVDCVSS:3.1/AV:L/AC:H/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

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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