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CVE Record

CVE-2022-48955: net: thunderbolt: fix memory leak in tbnet_open()

In the Linux kernel, the following vulnerability has been resolved: net: thunderbolt: fix memory leak in tbnet_open() When tb_ring_alloc_rx() failed in tbnet_open(), ida that allocated in tb_xdomain_alloc_out_hopid() is not released. Add tb_xdomain_release_out_hopid() to the error path to release ida.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue is a resource leak in Thunderbolt networking error handling. If opening the Thunderbolt network path fails at a specific allocation point, an allocated hop ID is not released. The public record does not provide CVSS, CWE, exploitability, or impact detail, so business urgency should be driven by affected kernel exposure and vendor patch availability.

Executive priority

Handle through standard Linux kernel patch governance unless critical assets use Thunderbolt networking. There is no provided evidence of active exploitation, but unresolved resource leaks can affect stability and should not be ignored in managed endpoint fleets.

Technical view

In tbnet_open(), failure of tb_ring_alloc_rx() did not release the IDA allocated by tb_xdomain_alloc_out_hopid(). The fix adds tb_xdomain_release_out_hopid() on that error path. The issue is tied to Linux Thunderbolt networking and kernel versions identified in the CVE source bundle, with stable kernel commits provided as references.

Likely exposure

Exposure appears limited to Linux systems running affected kernel versions with the Thunderbolt networking code present and relevant. The bundle lists Linux kernel versions and commit identifiers but provides no CPEs, distribution mapping, or deployment-specific exposure details.

Exploitation context

The CVE is not listed as KEV in the provided bundle, and no cited source states active exploitation. The sources describe a memory/resource leak on an error path, not a complete attack chain or remotely exploitable condition.

Researcher notes

Evidence is narrow: the record identifies a specific tbnet_open() cleanup bug and stable commits, but lacks CVSS, CWE, exploit preconditions, distribution advisories, and practical impact analysis. Avoid treating this as confirmed exploitable without additional vendor or upstream evidence.

Mitigation direction

  • Check Linux distribution advisories for CVE-2022-48955 applicability and fixed kernel packages.
  • Update affected systems to a kernel containing the referenced stable fixes.
  • Prioritize systems where Thunderbolt networking is enabled, exposed, or operationally important.
  • Use normal kernel maintenance windows if no higher-risk local context exists.

Validation and detection

  • Inventory Linux kernel versions across laptops, workstations, and servers.
  • Confirm whether Thunderbolt networking support is enabled or used on those systems.
  • Verify installed kernels include one of the referenced stable fix commits or vendor backports.
  • Record vendor advisory status where distribution package versions differ from upstream kernel versions.
Prepared
Confidence
medium
Sources
5

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-2022-48955 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
4Source 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
LinuxLinux180b0689425c6fb2b35e69a3316ee38371a782df, 180b0689425c6fb2b35e69a3316ee38371a782df, 180b0689425c6fb2b35e69a3316ee38371a782dfunaffected
LinuxLinux5.13, 0, 5.15.83, 6.0.13, 6.1affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.