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CVE Record

CVE-2022-50783: mptcp: use proper req destructor for IPv6

In the Linux kernel, the following vulnerability has been resolved: mptcp: use proper req destructor for IPv6 Before, only the destructor from TCP request sock in IPv4 was called even if the subflow was IPv6. It is important to use the right destructor to avoid memory leaks with some advanced IPv6 features, e.g. when the request socks contain specific IPv6 options.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2022-50783 is a Linux kernel MPTCP/IPv6 cleanup bug. The wrong cleanup routine could leave memory allocated in some IPv6 cases. The documented impact is memory leakage, which points to availability/resource risk rather than confirmed data theft or code execution.

Executive priority

Prioritize normal kernel patching for systems using MPTCP and IPv6, especially internet-facing or high-availability infrastructure. Treat as an availability maintenance issue unless vendor advisories add stronger severity or exploitation evidence.

Technical view

The Linux kernel MPTCP subflow request path called the TCP IPv4 request-socket destructor even when the subflow was IPv6. The fix uses the proper IPv6 destructor to avoid memory leaks when request sockets contain IPv6-specific options.

Likely exposure

Exposure is most likely on Linux systems using vulnerable kernel builds with MPTCP and IPv6 subflows, particularly where advanced IPv6 options are present. Systems not using MPTCP or already updated to vendor kernels containing the referenced stable fixes are less likely to be exposed.

Exploitation context

The provided sources do not report active exploitation, public exploit availability, CVSS, or CISA KEV listing. The source describes a kernel memory leak condition, not a confirmed privilege escalation or remote code execution path.

Researcher notes

Evidence is limited to the CVE record and upstream Linux stable commits. No CWE, CVSS, exploit status, or detailed attack preconditions are provided. Analysis should focus on affected kernel lineage, downstream backports, MPTCP enablement, and IPv6 request-socket option use.

Mitigation direction

  • Update affected Linux kernels using your distribution or vendor security channels.
  • Confirm the update includes the referenced upstream stable MPTCP IPv6 destructor fix.
  • If updating is delayed, review vendor guidance for MPTCP or IPv6 exposure reduction.

Validation and detection

  • Inventory Linux kernel versions across servers, appliances, containers hosts, and network-facing systems.
  • Identify systems with MPTCP enabled or dependent workloads using MPTCP over IPv6.
  • Verify installed kernel packages include the relevant stable commit or downstream backport.
  • Monitor affected systems for abnormal kernel memory growth until remediated.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2022-50783 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux79c0949e9a09f6a14a6dd18dc8396029423f9b68, 79c0949e9a09f6a14a6dd18dc8396029423f9b68, 79c0949e9a09f6a14a6dd18dc8396029423f9b68, 79c0949e9a09f6a14a6dd18dc8396029423f9b68, 79c0949e9a09f6a14a6dd18dc8396029423f9b68unaffected
LinuxLinux5.6, 0, 5.10.163, 5.15.87, 6.0.18, 6.1.4, 6.2affected
Weakness

CWE details

No CWE listed

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