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CVE Record

CVE-2024-47749: RDMA/cxgb4: Added NULL check for lookup_atid

In the Linux kernel, the following vulnerability has been resolved: RDMA/cxgb4: Added NULL check for lookup_atid The lookup_atid() function can return NULL if the ATID is invalid or does not exist in the identifier table, which could lead to dereferencing a null pointer without a check in the `act_establish()` and `act_open_rpl()` functions. Add a NULL check to prevent null pointer dereferencing. Found by Linux Verification Center (linuxtesting.org) with SVACE.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A flaw in the Linux cxgb4 RDMA driver can cause a kernel NULL-pointer dereference when an invalid or missing connection identifier is processed. The expected impact is loss of availability, potentially crashing an affected system. Confidentiality and data integrity impacts are not identified.

Executive priority

Prioritize remediation for systems actively using cxgb4 RDMA, especially where network traffic is untrusted or uptime is critical. Broader emergency action is not supported by the supplied evidence because active exploitation is unconfirmed and exposure depends on driver use. Complete targeted inventory and patch through normal high-severity timelines.

Technical view

lookup_atid() may return NULL for an invalid or absent ATID. act_establish() and act_open_rpl() previously used that result without checking it, enabling a NULL-pointer dereference. The stable-kernel correction adds the missing NULL check. The supplied CVSS 3.1 score is 7.5, with network reachability and availability-only impact.

Likely exposure

Exposure is most relevant where an affected Linux kernel uses the cxgb4 RDMA driver. The bundle identifies affected versions across several kernel branches through 6.12, but does not describe exact configurations or distribution backports. Systems without this driver active are less likely to be exposed; confirm with vendor-specific kernel status.

Exploitation context

The supplied record is not in KEV, and no cited source establishes active exploitation or a public exploit. The network CVSS vector indicates potentially remote reachability, but the bundle does not explain the required protocol state or environmental prerequisites. Treat exploitability details as incomplete.

Researcher notes

The defect is a missing return-value check in two cxgb4 connection-handling paths. The source bundle supports denial-of-service impact through NULL dereference, not code execution, information disclosure, or privilege escalation. Exact trigger conditions, reproducibility, and affected distribution package ranges are not fully documented here.

Mitigation direction

  • Install a vendor-supported kernel containing the applicable stable fix or distribution backport.
  • Check distribution advisories because package versions may not match upstream kernel version numbers.
  • If immediate patching is impossible, assess whether the cxgb4 RDMA driver can be safely disabled.
  • Prioritize internet-facing or untrusted-network systems where the affected driver is active.

Validation and detection

  • Inventory kernel and distribution package versions on systems using RDMA.
  • Confirm whether the cxgb4 driver is installed, loaded, and operational.
  • Compare vendor package status against CVE-2024-47749 and the cited stable fixes.
  • After updating, verify the running kernel includes the vendor backport or corrected upstream code.
  • Monitor affected hosts for kernel NULL-dereference events or unexpected reboots.
Prepared
Confidence
high
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.

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CVE-2024-47749 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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
2ADP providers
12Source links

SSVC decision data

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

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
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2024-47749Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxcfdda9d764362ab77b11a410bb928400e6520d57, cfdda9d764362ab77b11a410bb928400e6520d57, cfdda9d764362ab77b11a410bb928400e6520d57, cfdda9d764362ab77b11a410bb928400e6520d57, cfdda9d764362ab77b11a410bb928400e6520d57, cfdda9d764362ab77b11a410bb928400e6520d57, cfdda9d764362ab77b11a410bb928400e6520d57, cfdda9d764362ab77b11a410bb928400e6520d57, cfdda9d764362ab77b11a410bb928400e6520d57unaffected
LinuxLinux2.6.35, 0, 4.19.323, 5.4.285, 5.10.227, 5.15.168, 6.1.113, 6.6.54, 6.10.13, 6.11.2, 6.12affected
Weakness

CWE details

No CWE listed

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