CVE-2023-2513Public exploit

System crash via underflowed ext4 xattr offsets

Published May 8, 2023 · Updated Apr 23, 2025

Use-after-free in Linux Kernel 5.19 and earlier allows local users with high privileges to crash the system through an ext4 xattr write. In ext4_xattr_set_entry, a maximum i_extra_isize makes the computed min_offs and free sizes wrap before memcpy writes the extended attribute. High local privileges and a mounted ext4 filesystem with crafted extra inode sizing are required; successful triggering can crash the host.

CVSS severity6.7
Medium
EPSS probability0.24%
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 Linux Kernel 5.19 and earlier allows local users with high privileges to crash the system through an ext4 xattr write. In ext4_xattr_set_entry, a maximum i_extra_isize makes the computed min_offs and free sizes wrap before memcpy writes the extended attribute. High local privileges and a mounted ext4 filesystem with crafted extra inode sizing are required; successful triggering can crash the host.

The record

CVE
CVE-2023-2513
Published
May 8, 2023
Updated
Apr 23, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. May 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record 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=Fixed in kernel 6.0-rc1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Fixed in kernel 6.0-rc1

Published CVSS scores

6.7NIST NVDCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.7CISA-ADPCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.7UbuntuCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.7OracleCVSS:3.0/AV:L/AC:L/PR:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

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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