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CVE Record

CVE-2022-49020: net/9p: Fix a potential socket leak in p9_socket_open

In the Linux kernel, the following vulnerability has been resolved: net/9p: Fix a potential socket leak in p9_socket_open Both p9_fd_create_tcp() and p9_fd_create_unix() will call p9_socket_open(). If the creation of p9_trans_fd fails, p9_fd_create_tcp() and p9_fd_create_unix() will return an error directly instead of releasing the cscoket, which will result in a socket leak. This patch adds sock_release() to fix the leak issue.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2022-49020 is a Linux kernel 9p networking bug where failed 9p TCP or Unix socket setup can leave a socket unreleased. The likely business impact is resource leakage, not confirmed data theft or code execution. Public severity and CVSS are not provided in the source bundle.

Executive priority

Handle through normal kernel patch management unless 9p is used in sensitive or high-availability environments. Escalate priority if vendor advisories assign higher severity or if resource leakage is observed in production.

Technical view

The bug is in net/9p p9_socket_open usage by p9_fd_create_tcp() and p9_fd_create_unix(). If p9_trans_fd creation fails, the error path returns without releasing the socket. The kernel fix adds sock_release() on that failure path.

Likely exposure

Exposure is most relevant to Linux systems using the kernel 9p client or transport paths. The bundle lists Linux kernel versions from 2.6.33 through 6.1 as affected, with multiple stable commit references as fixes.

Exploitation context

The source bundle does not show CISA KEV listing, public exploitation, exploit code, or a weaponized scenario. Treat this as a resource-leak vulnerability until vendor or distribution guidance says otherwise.

Researcher notes

Evidence is limited to the CVE record and kernel stable references. No CWE, CVSS, exploit status, or complete fixed-version mapping is provided. Validation should focus on patch presence and whether local workloads exercise Linux 9p paths.

Mitigation direction

  • Update affected Linux kernels using vendor or distribution security guidance.
  • Prioritize kernels using 9p networking, virtualization, or shared filesystem features.
  • Compare deployed kernels against the referenced stable kernel commits.
  • Disable unneeded 9p usage where operationally safe.
  • Track vendor advisories for fixed package versions.

Validation and detection

  • Inventory Linux kernel versions across servers, endpoints, and appliances.
  • Identify systems using 9p filesystem or transport functionality.
  • Confirm whether vendor kernel packages include the referenced fix commits.
  • Review change logs for sock_release() handling in the 9p socket failure path.
  • Monitor affected systems for unusual socket or file descriptor growth.
Prepared
Confidence
medium
Sources
10

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-2022-49020 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
3Timeline events
1ADP providers
9Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux6b18662e239a032f908b7f6e164bdf7e2e0a32c9, 6b18662e239a032f908b7f6e164bdf7e2e0a32c9, 6b18662e239a032f908b7f6e164bdf7e2e0a32c9, 6b18662e239a032f908b7f6e164bdf7e2e0a32c9, 6b18662e239a032f908b7f6e164bdf7e2e0a32c9, 6b18662e239a032f908b7f6e164bdf7e2e0a32c9, 6b18662e239a032f908b7f6e164bdf7e2e0a32c9, 6b18662e239a032f908b7f6e164bdf7e2e0a32c9unaffected
LinuxLinux2.6.33, 0, 4.9.335, 4.14.301, 4.19.268, 5.4.226, 5.10.158, 5.15.82, 6.0.12, 6.1affected
Weakness

CWE details

No CWE listed

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