CVE-2022-50783Network attack vector

Kernel memory leak via wrong IPv6 destructor

Published Dec 24, 2025 · Updated Dec 24, 2025

Memory leakage in the IPv6 MPTCP request-socket path in Linux allows remote attackers to consume kernel memory via specific IPv6 options. The IPv6 subflow request-socket operations retain the IPv4 TCP destructor instead of installing the IPv6-aware MPTCP destructor, so IPv6 option resources are not released. Reachability requires MPTCP over IPv6 and request sockets carrying affected IPv6 options; the documented consequence is memory leakage, not data disclosure.

CVSS severity6.9
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leakage in the IPv6 MPTCP request-socket path in Linux allows remote attackers to consume kernel memory via specific IPv6 options. The IPv6 subflow request-socket operations retain the IPv4 TCP destructor instead of installing the IPv6-aware MPTCP destructor, so IPv6 option resources are not released. Reachability requires MPTCP over IPv6 and request sockets carrying affected IPv6 options; the documented consequence is memory leakage, not data disclosure.

The record

CVE
CVE-2022-50783
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 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=5.6
  2. Affected versionversion=79c0949e9a09f6a14a6dd18dc8396029423f9b68 <092953f3c4cd65f88b27b87a922f6c725f34ee04
  3. Affected versionversion=79c0949e9a09f6a14a6dd18dc8396029423f9b68 <1922ea6b0ae2ea0c9a09be0eafafe1cd1069d259
  4. Affected versionversion=79c0949e9a09f6a14a6dd18dc8396029423f9b68 <6eb02c596ec02e5897ae377e065cb7df55337a96
  5. Affected versionversion=79c0949e9a09f6a14a6dd18dc8396029423f9b68 <bd5dc96fea4edd16d2e22f41b4dd50a4cfbeb919
  6. Affected versionversion=79c0949e9a09f6a14a6dd18dc8396029423f9b68 <d3295fee3c756ece33ac0d935e172e68c0a4161b

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=79c0949e9a09f6a14a6dd18dc8396029423f9b68 <092953f3c4cd65f88b27b87a922f6c725f34ee04; version=79c0949e9a09f6a14a6dd18dc8396029423f9b68 <1922ea6b0ae2ea0c9a09be0eafafe1cd1069d259; version=79c0949e9a09f6a14a6dd18dc8396029423f9b68 <6eb02c596ec02e5897ae377e065cb7df55337a96; version=79c0949e9a09f6a14a6dd18dc8396029423f9b68 <bd5dc96fea4edd16d2e22f41b4dd50a4cfbeb919; version=79c0949e9a09f6a14a6dd18dc8396029423f9b68 <d3295fee3c756ece33ac0d935e172e68c0a4161b

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
6.9SUSECVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
5.3SUSECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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