CVE-2023-53731

System hang via IRQ-unsafe netlink locking

Published Oct 22, 2025 · Updated Oct 22, 2025

A deadlock in the Linux kernel netlink subsystem allows attackers to hang an affected system through concurrent netlink operations. netlink_set_err() and __netlink_diag_dump() take nl_table_lock without IRQ-safe locking, allowing an interrupt handler holding queue_stop_reason_lock to invert the lock order and deadlock. The published reproducer is a local syzkaller workload; required privileges and remote reachability are not established, and the demonstrated consequence is a system hang.

CVSS severityUnavailable
Unscored
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A deadlock in the Linux kernel netlink subsystem allows attackers to hang an affected system through concurrent netlink operations. netlink_set_err() and __netlink_diag_dump() take nl_table_lock without IRQ-safe locking, allowing an interrupt handler holding queue_stop_reason_lock to invert the lock order and deadlock. The published reproducer is a local syzkaller workload; required privileges and remote reachability are not established, and the demonstrated consequence is a system hang.

The record

CVE
CVE-2023-53731
Published
Oct 22, 2025
Updated
Oct 22, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 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=1d482e666b8e74c7555dbdfbfb77205eeed3ff2d <1556ba034b95cfd4f75ea93c1a2679ae0444bba1
  2. Affected versionversion=1d482e666b8e74c7555dbdfbfb77205eeed3ff2d <61ffe8b1ee084e5c82a4e4bbf9e7b68e0c06e464
  3. Affected versionversion=1d482e666b8e74c7555dbdfbfb77205eeed3ff2d <8d61f926d42045961e6b65191c09e3678d86a9cf
  4. Affected versionversion=1d482e666b8e74c7555dbdfbfb77205eeed3ff2d <a641240b7e071c5538dc0e7894ece833fce459dd
  5. Affected versionversion=1d482e666b8e74c7555dbdfbfb77205eeed3ff2d <eb8e27c8fa9397b4a7b181c48fa58157dbe9902e
  6. Affected versionversion=1d6d43d4805da9b3fa0f5841e8b1083c89868f35 <cde7b90e0539a3b11da377e463dfd2288a162dbf
  7. Affected versionversion=21df0c2e7d195de4a3c650de9361b3037fa6c59a <8f6652ed2ad98fe6d13b903483d9257762ab2ec6
  8. Affected versionversion=5.13
  9. Affected versionversion=59fba11d649854134c75ad88c8adafa9304ac419 <4b9adb8d4a62ff7608d4a7d4eb42036a88f30980
  10. Affected versionversion=5f155c4046200f067b1dc3140ea99ef56e4e0b74
  11. Affected versionversion=76cc8e04f38c2bbfcba07f62864a011f142bd40c
  12. Affected versionversion=82b2ea5f904b3826934df4a00f3b8806272185f6 <c09e8e3f7fd432984bf5422302b093d2371dfc48
  13. Affected versionversion=a8e9111a8625dd11e70edd61f7a1ccd26c041442

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=1d482e666b8e74c7555dbdfbfb77205eeed3ff2d <1556ba034b95cfd4f75ea93c1a2679ae0444bba1; version=1d482e666b8e74c7555dbdfbfb77205eeed3ff2d <61ffe8b1ee084e5c82a4e4bbf9e7b68e0c06e464; version=1d482e666b8e74c7555dbdfbfb77205eeed3ff2d <8d61f926d42045961e6b65191c09e3678d86a9cf; version=1d482e666b8e74c7555dbdfbfb77205eeed3ff2d <a641240b7e071c5538dc0e7894ece833fce459dd; version=1d482e666b8e74c7555dbdfbfb77205eeed3ff2d <eb8e27c8fa9397b4a7b181c48fa58157dbe9902e; version=1d6d43d4805da9b3fa0f5841e8b1083c89868f35 <cde7b90e0539a3b11da377e463dfd2288a162dbf; version=21df0c2e7d195de4a3c650de9361b3037fa6c59a <8f6652ed2ad98fe6d13b903483d9257762ab2ec6; version=5.13; version=59fba11d649854134c75ad88c8adafa9304ac419 <4b9adb8d4a62ff7608d4a7d4eb42036a88f30980; version=5f155c4046200f067b1dc3140ea99ef56e4e0b74; version=76cc8e04f38c2bbfcba07f62864a011f142bd40c; version=82b2ea5f904b3826934df4a00f3b8806272185f6 <c09e8e3f7fd432984bf5422302b093d2371dfc48; version=a8e9111a8625dd11e70edd61f7a1ccd26c041442

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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

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Your stack

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