CVE-2023-53492

Local privilege escalation via stale chain reference

Published Oct 1, 2025 · Updated Aug 5, 2026

Use-after-free in Linux kernel nf_tables allows local users to gain kernel privileges through a crafted netlink batch. The nft_chain_lookup_byid function ignores the transaction generation mask, so a rule added by chain ID after deletion in the same batch retains a reference to the freed chain. Triggering requires CAP_NET_ADMIN in the governing user namespace, which a local process can obtain in a new user and network namespace; exploitation can corrupt kernel memory, disclose or modify protected data, or panic the host.

CVSS severity7.8
High
EPSS probability0.17%
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

Use-after-free in Linux kernel nf_tables allows local users to gain kernel privileges through a crafted netlink batch. The nft_chain_lookup_byid function ignores the transaction generation mask, so a rule added by chain ID after deletion in the same batch retains a reference to the freed chain. Triggering requires CAP_NET_ADMIN in the governing user namespace, which a local process can obtain in a new user and network namespace; exploitation can corrupt kernel memory, disclose or modify protected data, or panic the host.

The record

CVE
CVE-2023-53492
Published
Oct 1, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 1, 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=5.9
  2. Affected versionversion=837830a4b439bfeb86c70b0115c280377c84714b <041e2ac88caef286b39064e83e825e3f53113d36
  3. Affected versionversion=837830a4b439bfeb86c70b0115c280377c84714b <4ae2e501331aaa506eaf760339bb2f43e5769395
  4. Affected versionversion=837830a4b439bfeb86c70b0115c280377c84714b <515ad530795c118f012539ed76d02bacfd426d89
  5. Affected versionversion=837830a4b439bfeb86c70b0115c280377c84714b <5e5e967e8505fbdabfb6497367ec1b808cadc356
  6. Affected versionversion=837830a4b439bfeb86c70b0115c280377c84714b <fc95c8b02c6160936f1f3d8d9d7f4f66f3c84b49

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.9; version=837830a4b439bfeb86c70b0115c280377c84714b <041e2ac88caef286b39064e83e825e3f53113d36; version=837830a4b439bfeb86c70b0115c280377c84714b <4ae2e501331aaa506eaf760339bb2f43e5769395; version=837830a4b439bfeb86c70b0115c280377c84714b <515ad530795c118f012539ed76d02bacfd426d89; version=837830a4b439bfeb86c70b0115c280377c84714b <5e5e967e8505fbdabfb6497367ec1b808cadc356; version=837830a4b439bfeb86c70b0115c280377c84714b <fc95c8b02c6160936f1f3d8d9d7f4f66f3c84b49

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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