CVE-2024-56655

Local privilege escalation via unserialized rule destruction

Published Dec 27, 2024 · Updated Aug 5, 2026

Use-after-free in Linux kernel nf_tables 6.6.61 through 6.6.66 and 6.11.8 through 6.12.5 allows local users to gain kernel privileges. Rule destruction runs from call_rcu without the transaction mutex or an intervening synchronize_rcu, so deactivation callbacks race reference-count and object updates. An unprivileged local user can obtain CAP_NET_ADMIN in a user namespace, trigger the path through netlink, and cause kernel memory disclosure, corruption, or a panic.

CVSS severity7.8
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Use-after-free in Linux kernel nf_tables 6.6.61 through 6.6.66 and 6.11.8 through 6.12.5 allows local users to gain kernel privileges. Rule destruction runs from call_rcu without the transaction mutex or an intervening synchronize_rcu, so deactivation callbacks race reference-count and object updates. An unprivileged local user can obtain CAP_NET_ADMIN in a user namespace, trigger the path through netlink, and cause kernel memory disclosure, corruption, or a panic.

The record

CVE
CVE-2024-56655
Published
Dec 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE 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

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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=558f503f707f481bbf40efa74a938b8021df841d <2991dc357a28b61c13ed1f7b59e9251e2b4562fb
  2. Affected versionversion=6.11.8 <6.12
  3. Affected versionversion=6.12
  4. Affected versionversion=6.6.61 <6.6.67
  5. Affected versionversion=9eee6097ffb26cdd2adb988c0d378fa0d650c737 <5146c27b2780aac59876a887a5f4e793b8949862
  6. Affected versionversion=a394c160d57f4b083bd904a22802f6fb7f5b3cea <b8d8f53e1858178882b881b8c09f94ef0e83bf76
  7. Affected versionversion=bfd05c68e4c6320304e9f371ffa356b6e4b9cc53 <27f0574253f6c24c8ee4e3f0a685b75ed3a256ed
  8. Affected versionversion=c03d278fdf35e73dd0ec543b9b556876b9d9a8dc <7cf0bd232b565d9852cb25fd094f77254773e048
  9. Affected versionversion=c03d278fdf35e73dd0ec543b9b556876b9d9a8dc <b04df3da1b5c6f6dc7cdccc37941740c078c4043
  10. Affected versionversion=cb401e5799e0acacb405f2128097e9c4ccf82f8a
  11. Affected versionversion=e6c32a64d61184c2bdf89442b3d31ef530afba34 <b0f013bebf94fe7ae75e5a53be2f2bd1cc1841e3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=558f503f707f481bbf40efa74a938b8021df841d <2991dc357a28b61c13ed1f7b59e9251e2b4562fb; version=6.11.8 <6.12; version=6.12; version=6.6.61 <6.6.67; version=9eee6097ffb26cdd2adb988c0d378fa0d650c737 <5146c27b2780aac59876a887a5f4e793b8949862; version=a394c160d57f4b083bd904a22802f6fb7f5b3cea <b8d8f53e1858178882b881b8c09f94ef0e83bf76; version=bfd05c68e4c6320304e9f371ffa356b6e4b9cc53 <27f0574253f6c24c8ee4e3f0a685b75ed3a256ed; version=c03d278fdf35e73dd0ec543b9b556876b9d9a8dc <7cf0bd232b565d9852cb25fd094f77254773e048; version=c03d278fdf35e73dd0ec543b9b556876b9d9a8dc <b04df3da1b5c6f6dc7cdccc37941740c078c4043; version=cb401e5799e0acacb405f2128097e9c4ccf82f8a; version=e6c32a64d61184c2bdf89442b3d31ef530afba34 <b0f013bebf94fe7ae75e5a53be2f2bd1cc1841e3

Published CVSS scores

7.8Linux CVE Numbering AuthorityCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Oracle LinuxCVSS: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

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

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Your stack

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