CVE-2022-49672

Local privilege escalation via dangling TUN NAPI entry

Published Feb 26, 2025 · Updated Aug 5, 2026

Use-after-free in the TUN/TAP driver in Linux allows local users to crash the kernel or gain kernel privileges through local device operations. The queue-detachment path frees a tun_file without removing its embedded NAPI object from the network device's NAPI list, leaving a dangling list entry. Exploitation requires local access to /dev/net/tun and CAP_NET_ADMIN in a user-created network namespace; concurrent queue detach, link deletion, and file close can cause a kernel panic or memory corruption.

CVSS severity7.8
High
EPSS probability0.30%
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 the TUN/TAP driver in Linux allows local users to crash the kernel or gain kernel privileges through local device operations. The queue-detachment path frees a tun_file without removing its embedded NAPI object from the network device's NAPI list, leaving a dangling list entry. Exploitation requires local access to /dev/net/tun and CAP_NET_ADMIN in a user-created network namespace; concurrent queue detach, link deletion, and file close can cause a kernel panic or memory corruption.

The record

CVE
CVE-2022-49672
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 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=4.15
  2. Affected versionversion=943170998b200190f99d3fe7e771437e2c51f319 <3b9bc84d311104906d2b4995a9a02d7b7ddab2db
  3. Affected versionversion=943170998b200190f99d3fe7e771437e2c51f319 <8145f77d38de4f88b8a69e1463f5c09ba189d77c
  4. Affected versionversion=943170998b200190f99d3fe7e771437e2c51f319 <82e729aee59acefe135fceffadcbc5b86dd4f1b9
  5. Affected versionversion=943170998b200190f99d3fe7e771437e2c51f319 <8661d4b8faa2f7ee7a559969c0a7c57f077b1728
  6. Affected versionversion=943170998b200190f99d3fe7e771437e2c51f319 <a8cf919022373c97a84fe596bbea544f909c485d
  7. Affected versionversion=943170998b200190f99d3fe7e771437e2c51f319 <bec1be0a745ab420718217e3e0d9542a75108989

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.15; version=943170998b200190f99d3fe7e771437e2c51f319 <3b9bc84d311104906d2b4995a9a02d7b7ddab2db; version=943170998b200190f99d3fe7e771437e2c51f319 <8145f77d38de4f88b8a69e1463f5c09ba189d77c; version=943170998b200190f99d3fe7e771437e2c51f319 <82e729aee59acefe135fceffadcbc5b86dd4f1b9; version=943170998b200190f99d3fe7e771437e2c51f319 <8661d4b8faa2f7ee7a559969c0a7c57f077b1728; version=943170998b200190f99d3fe7e771437e2c51f319 <a8cf919022373c97a84fe596bbea544f909c485d; version=943170998b200190f99d3fe7e771437e2c51f319 <bec1be0a745ab420718217e3e0d9542a75108989

Published CVSS scores

5.5CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7OracleCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7Red HatCVSS:3.1/AV:L/AC:H/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.

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

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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