LiveActive security incident?Get immediate response
CVE Record

CVE-2024-55639: net: renesas: rswitch: avoid use-after-put for a device tree node

In the Linux kernel, the following vulnerability has been resolved: net: renesas: rswitch: avoid use-after-put for a device tree node The device tree node saved in the rswitch_device structure is used at several driver locations. So passing this node to of_node_put() after the first use is wrong. Move of_node_put() for this node to exit paths.

HighCVSS 8.4Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A flaw in the Linux Renesas R-Switch network driver can reuse a device-tree reference after releasing it. On systems that use this driver, the resulting kernel memory corruption could affect confidentiality, integrity, and availability. The issue requires local access and appears limited to relevant Renesas hardware and affected kernel builds.

Executive priority

Prioritize confirmation and remediation for exposed Renesas networking platforms, especially multi-user or workload-hosting systems. Broad emergency action across unrelated Linux systems is not supported by the evidence. Escalate promptly where the affected driver is active because successful memory corruption could fully compromise the host or cause service failure.

Technical view

The rswitch driver stores a device-tree node in its device structure but previously called of_node_put() after its first use. Later driver paths could therefore access a released reference. The correction defers of_node_put() to exit paths. The supplied CVSS 3.1 score is 8.4 with local, low-complexity, no-privilege, no-user-interaction characteristics.

Likely exposure

Exposure is most likely on Linux systems using the Renesas rswitch driver and associated device-tree configuration. General-purpose Linux systems without this driver or hardware are unlikely to be exposed. The bundle identifies 6.3 and several later versions, but its version metadata does not clearly distinguish introduction and fixed boundaries.

Exploitation context

The supplied record is not in CISA KEV and provides no evidence of active exploitation or a public exploit. The CVSS vector describes local access without privileges or user interaction, but the sources do not document a proven attack path. Treat exploitability beyond the underlying lifetime error as unconfirmed.

Researcher notes

The defect is a device-tree node lifetime-management error: a stored reference is released before all consumers finish using it. The source bundle supplies no CWE, crash trace, exploitability analysis, or definitive version-range syntax. Duplicate commit identifiers and ambiguous affected-version metadata warrant verification against kernel or distribution advisories.

Mitigation direction

  • Update to a vendor-supported kernel containing the applicable linked stable fix.
  • Prioritize affected Renesas systems where untrusted users or local workloads can execute.
  • If updating is delayed, restrict local access and untrusted workload execution.
  • Check Linux distribution or device-vendor advisories for backported-fix status.

Validation and detection

  • Inventory kernel builds on systems using Renesas R-Switch hardware.
  • Confirm whether the rswitch driver and matching device-tree node are present.
  • Compare vendor patch status with the three linked stable-kernel commits.
  • After updating, verify the running kernel package includes the applicable fix.
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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2024-55639 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
High
CVSS
8.4 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

1CVSS vectors
3Timeline events
0ADP providers
4Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8.4CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.55.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

8.4High
CVSS 3.1 vector shape for CVE-2024-55639Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

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.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxb46f1e5793298c67efc2f1b917350a2cefacf9d6, b46f1e5793298c67efc2f1b917350a2cefacf9d6, b46f1e5793298c67efc2f1b917350a2cefacf9d6unaffected
LinuxLinux6.3, 0, 6.6.67, 6.12.6, 6.13affected
Weakness

CWE details

No CWE listed

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