CVE-2026-45901

Local system hang via nf_tables lock inversion

Published May 27, 2026 · Updated May 27, 2026

Deadlock in Linux Kernel nf_tables allows local users to hang the system by running concurrent nft, ipset, and iptables-nft operations. The nf_tables reset path acquires commit_mutex across dump-and-reset handling, creating a circular dependency with nfnl_subsys_ipset and nlk_cb_mutex. Exploitation requires local privileges and simultaneous nft reset, ipset list, and iptables-nft -m set activity; the bounded consequence is loss of availability.

CVSS severity5.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in Linux Kernel nf_tables allows local users to hang the system by running concurrent nft, ipset, and iptables-nft operations. The nf_tables reset path acquires commit_mutex across dump-and-reset handling, creating a circular dependency with nfnl_subsys_ipset and nlk_cb_mutex. Exploitation requires local privileges and simultaneous nft reset, ipset list, and iptables-nft -m set activity; the bounded consequence is loss of availability.

The record

CVE
CVE-2026-45901
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=3cb03edb4de33fd04c4ea55f47397b96a8657c53 <7f261bb906bf527c4a6e2a646e2d5f3679f2a8bc
  2. Affected versionversion=3cb03edb4de33fd04c4ea55f47397b96a8657c53 <ee3978b6a0dcd4215cb7cedcba705a12174786a7
  3. Affected versionversion=6.1.107 <6.2
  4. Affected versionversion=6.6.48 <6.7
  5. Affected versionversion=6.7
  6. Affected versionversion=f123293db16dcd0cd81b246ae60e6362f0025d0a
  7. Affected versionversion=fb1adb05ea87b6149e65a31e511756c4f470d0cd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3cb03edb4de33fd04c4ea55f47397b96a8657c53 <7f261bb906bf527c4a6e2a646e2d5f3679f2a8bc; version=3cb03edb4de33fd04c4ea55f47397b96a8657c53 <ee3978b6a0dcd4215cb7cedcba705a12174786a7; version=6.1.107 <6.2; version=6.6.48 <6.7; version=6.7; version=f123293db16dcd0cd81b246ae60e6362f0025d0a; version=fb1adb05ea87b6149e65a31e511756c4f470d0cd

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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

T1499.004Application or System Exploitation

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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