CVE-2022-49014

Local privilege escalation via TUN teardown use-after-free

Published Oct 21, 2024 · Updated Aug 5, 2026

Use-after-free in affected Linux kernel revisions allows local users to execute code in kernel context during TUN device teardown. In __tun_detach(), sock_put() drops the final reference to struct net before netdev_state_change() invokes notifier_call_chain() on the freed object. Opening /dev/net/tun, attaching a nonpersistent TUN interface with TUNSETIFF, and closing the descriptor requires CAP_NET_ADMIN in the user namespace; user namespaces let local users meet that gate, leading to kernel memory disclosure, arbitrary writes, code execution, or a kernel panic.

CVSS severity7.8
High
EPSS probability0.26%
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 affected Linux kernel revisions allows local users to execute code in kernel context during TUN device teardown. In __tun_detach(), sock_put() drops the final reference to struct net before netdev_state_change() invokes notifier_call_chain() on the freed object. Opening /dev/net/tun, attaching a nonpersistent TUN interface with TUNSETIFF, and closing the descriptor requires CAP_NET_ADMIN in the user namespace; user namespaces let local users meet that gate, leading to kernel memory disclosure, arbitrary writes, code execution, or a kernel panic.

The record

CVE
CVE-2022-49014
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 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=4.17
  2. Affected versionversion=83c1f36f9880814b24cdf6c2f91f66f61db65326 <04b995e963229501401810dab89dc73e7f12d054
  3. Affected versionversion=83c1f36f9880814b24cdf6c2f91f66f61db65326 <16c244bc65d1175775325ec0489a5a5c830e02c7
  4. Affected versionversion=83c1f36f9880814b24cdf6c2f91f66f61db65326 <1f23f1890d91812c35d32eab1b49621b6d32dc7b
  5. Affected versionversion=83c1f36f9880814b24cdf6c2f91f66f61db65326 <4cde8da2d814a3b7b176db81922d4ddaad7c0f0e
  6. Affected versionversion=83c1f36f9880814b24cdf6c2f91f66f61db65326 <5daadc86f27ea4d691e2131c04310d0418c6cd12
  7. Affected versionversion=83c1f36f9880814b24cdf6c2f91f66f61db65326 <5f442e1d403e0496bacb74a58e2be7f500695e6f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.17; version=83c1f36f9880814b24cdf6c2f91f66f61db65326 <04b995e963229501401810dab89dc73e7f12d054; version=83c1f36f9880814b24cdf6c2f91f66f61db65326 <16c244bc65d1175775325ec0489a5a5c830e02c7; version=83c1f36f9880814b24cdf6c2f91f66f61db65326 <1f23f1890d91812c35d32eab1b49621b6d32dc7b; version=83c1f36f9880814b24cdf6c2f91f66f61db65326 <4cde8da2d814a3b7b176db81922d4ddaad7c0f0e; version=83c1f36f9880814b24cdf6c2f91f66f61db65326 <5daadc86f27ea4d691e2131c04310d0418c6cd12; version=83c1f36f9880814b24cdf6c2f91f66f61db65326 <5f442e1d403e0496bacb74a58e2be7f500695e6f

Published CVSS scores

7.8NIST NVDCVSS: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

CWE-416Use After Free
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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