CVE-2023-53100

Kernel memory corruption via stale inline-data offset

Published May 2, 2025 · Updated Aug 5, 2026

Memory corruption in Linux before 6.3 allows local users to read or write kernel memory via file operations on a mounted ext4 volume. After ext4_xattr_shift_entries moves extended-attribute entries, the code leaves i_inline_off stale, so inline-data helpers read an incorrect entry and convert a negative free-space calculation into a huge unsigned allocation. The path requires write access to an ext4 inline-data directory whose inode needs extra-isize expansion; out-of-bounds accesses can disclose or corrupt kernel memory, and the demonstrated allocation path can crash the kernel.

CVSS severity7.8
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Memory corruption in Linux before 6.3 allows local users to read or write kernel memory via file operations on a mounted ext4 volume. After ext4_xattr_shift_entries moves extended-attribute entries, the code leaves i_inline_off stale, so inline-data helpers read an incorrect entry and convert a negative free-space calculation into a huge unsigned allocation. The path requires write access to an ext4 inline-data directory whose inode needs extra-isize expansion; out-of-bounds accesses can disclose or corrupt kernel memory, and the demonstrated allocation path can crash the kernel.

The record

CVE
CVE-2023-53100
Published
May 2, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 2, 2025CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.8
  2. Affected versionversion=67cf5b09a46f72e048501b84996f2f77bc42e947 <2b96b4a5d9443ca4cad58b0040be455803c05a42
  3. Affected versionversion=67cf5b09a46f72e048501b84996f2f77bc42e947 <35161cec76772f74526f5886ad4082ec48511d5c
  4. Affected versionversion=67cf5b09a46f72e048501b84996f2f77bc42e947 <39c5df2ca544368b44b59d0f6d80131e90763371
  5. Affected versionversion=67cf5b09a46f72e048501b84996f2f77bc42e947 <74d775083e9f3d9dadf9e3b5f3e0028d1ad0bd5c
  6. Affected versionversion=67cf5b09a46f72e048501b84996f2f77bc42e947 <92eee6a82a9a6f9f83559e17a2b6b935e1a5cd25
  7. Affected versionversion=67cf5b09a46f72e048501b84996f2f77bc42e947 <a9bd94f67b27739bbe8583c52256502bd4cc7e83
  8. Affected versionversion=67cf5b09a46f72e048501b84996f2f77bc42e947 <c5aa102b433b1890e1ccaa40c06826c77dda1665
  9. Affected versionversion=67cf5b09a46f72e048501b84996f2f77bc42e947 <ca500cf2eceb5a8e93bf71ab97b5f7a18ecabce2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.8; version=67cf5b09a46f72e048501b84996f2f77bc42e947 <2b96b4a5d9443ca4cad58b0040be455803c05a42; version=67cf5b09a46f72e048501b84996f2f77bc42e947 <35161cec76772f74526f5886ad4082ec48511d5c; version=67cf5b09a46f72e048501b84996f2f77bc42e947 <39c5df2ca544368b44b59d0f6d80131e90763371; version=67cf5b09a46f72e048501b84996f2f77bc42e947 <74d775083e9f3d9dadf9e3b5f3e0028d1ad0bd5c; version=67cf5b09a46f72e048501b84996f2f77bc42e947 <92eee6a82a9a6f9f83559e17a2b6b935e1a5cd25; version=67cf5b09a46f72e048501b84996f2f77bc42e947 <a9bd94f67b27739bbe8583c52256502bd4cc7e83; version=67cf5b09a46f72e048501b84996f2f77bc42e947 <c5aa102b433b1890e1ccaa40c06826c77dda1665; version=67cf5b09a46f72e048501b84996f2f77bc42e947 <ca500cf2eceb5a8e93bf71ab97b5f7a18ecabce2

Published CVSS scores

7.8LinuxCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo