CVE-2022-50405Public exploit

Local privilege escalation via VXLAN socket race

Published Sep 18, 2025 · Updated Sep 18, 2025

Use-after-free in the Linux kernel VXLAN path allows local users to escalate privileges by racing tunnel teardown with packet receipt. The teardown path releases a UDP tunnel socket before RCU sk_user_data readers finish, letting vxlan_ecn_decapsulate use a freed vxlan_sock. Creating and deleting the tunnel requires CAP_NET_ADMIN in a network namespace; a successful race can expose or modify kernel memory or crash the host.

CVSS severity5.5
Medium
EPSS probability0.17%
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 the Linux kernel VXLAN path allows local users to escalate privileges by racing tunnel teardown with packet receipt. The teardown path releases a UDP tunnel socket before RCU sk_user_data readers finish, letting vxlan_ecn_decapsulate use a freed vxlan_sock. Creating and deleting the tunnel requires CAP_NET_ADMIN in a network namespace; a successful race can expose or modify kernel memory or crash the host.

The record

CVE
CVE-2022-50405
Published
Sep 18, 2025
Updated
Sep 18, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2025Record 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=3.18
  2. Affected versionversion=6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d <303000c793f705d07b551eb7c1c27001c5b33c8d
  3. Affected versionversion=6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d <3cf7203ca620682165706f70a1b12b5194607dce
  4. Affected versionversion=6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d <588d0b8462f5ffed3e677e65639825b2678117ab
  5. Affected versionversion=6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d <84e566d157cc22ad2da8bdd970495855fbf13d92
  6. Affected versionversion=6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d <91f09a776ae335ca836ed864b8f2a9461882a280
  7. Affected versionversion=6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d <9a6544343bba7da929d6d4a2dc44ec0f15970081
  8. Affected versionversion=6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d <b38aa7465411795e9e744b8d94633910497fec2a
  9. Affected versionversion=6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d <be34e79e0ae6adbf6e7e75ddaee9ad84795ab933
  10. Affected versionversion=6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d <e8316584b0a6c61c9c407631040c22712b26e38c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.18; version=6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d <303000c793f705d07b551eb7c1c27001c5b33c8d; version=6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d <3cf7203ca620682165706f70a1b12b5194607dce; version=6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d <588d0b8462f5ffed3e677e65639825b2678117ab; version=6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d <84e566d157cc22ad2da8bdd970495855fbf13d92; version=6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d <91f09a776ae335ca836ed864b8f2a9461882a280; version=6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d <9a6544343bba7da929d6d4a2dc44ec0f15970081; version=6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d <b38aa7465411795e9e744b8d94633910497fec2a; version=6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d <be34e79e0ae6adbf6e7e75ddaee9ad84795ab933; version=6a93cc9052748c6355ec9d5b6c38b77f85f1cb0d <e8316584b0a6c61c9c407631040c22712b26e38c

Published CVSS scores

5.5Canonical UbuntuCVSS: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 exploitPublished

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

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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