CVE-2022-50212

Local privilege escalation via cross-table CHAIN_ID lookup

Published Jun 18, 2025 · Updated Aug 5, 2026

Use-after-free in Linux kernel nf_tables allows local users to execute code through a cross-table CHAIN_ID rule. The same-batch chain lookup accepts an ID from another table, leaving rule expressions tied to freed objects after their original table is deleted. A local process needs NETLINK_NETFILTER access and CAP_NET_ADMIN, obtainable in enabled user and network namespaces; processing the dangling expressions can disclose or overwrite kernel memory or crash the host.

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

What happened

Use-after-free in Linux kernel nf_tables allows local users to execute code through a cross-table CHAIN_ID rule. The same-batch chain lookup accepts an ID from another table, leaving rule expressions tied to freed objects after their original table is deleted. A local process needs NETLINK_NETFILTER access and CAP_NET_ADMIN, obtainable in enabled user and network namespaces; processing the dangling expressions can disclose or overwrite kernel memory or crash the host.

The record

CVE
CVE-2022-50212
Published
Jun 18, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 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

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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=5.9
  2. Affected versionversion=837830a4b439bfeb86c70b0115c280377c84714b <0f49613a213d918af790c1276f79da741968de11
  3. Affected versionversion=837830a4b439bfeb86c70b0115c280377c84714b <58e863f64ee3d0879297e5e53b646e4b91e59620
  4. Affected versionversion=837830a4b439bfeb86c70b0115c280377c84714b <91501513016903077f91033fa5d2aa26cac399b2
  5. Affected versionversion=837830a4b439bfeb86c70b0115c280377c84714b <95f466d22364a33d183509629d0879885b4f547e
  6. Affected versionversion=837830a4b439bfeb86c70b0115c280377c84714b <9e7dcb88ec8e85e4a8ad0ea494ea2f90f32d2583

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.9; version=837830a4b439bfeb86c70b0115c280377c84714b <0f49613a213d918af790c1276f79da741968de11; version=837830a4b439bfeb86c70b0115c280377c84714b <58e863f64ee3d0879297e5e53b646e4b91e59620; version=837830a4b439bfeb86c70b0115c280377c84714b <91501513016903077f91033fa5d2aa26cac399b2; version=837830a4b439bfeb86c70b0115c280377c84714b <95f466d22364a33d183509629d0879885b4f547e; version=837830a4b439bfeb86c70b0115c280377c84714b <9e7dcb88ec8e85e4a8ad0ea494ea2f90f32d2583

Published CVSS scores

7.8Linux kernel CVE teamCVSS: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.

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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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