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CVE Record

CVE-2024-47668: lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc()

In the Linux kernel, the following vulnerability has been resolved: lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc() If we need to increase the tree depth, allocate a new node, and then race with another thread that increased the tree depth before us, we'll still have a preallocated node that might be used later. If we then use that node for a new non-root node, it'll still have a pointer to the old root instead of being zeroed - fix this by zeroing it in the cmpxchg failure path.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A rare Linux kernel timing flaw can reuse an internal tree node containing an outdated pointer. A local, low-privileged user may be able to trigger serious confidentiality, integrity, or availability impact, although the supplied sources do not demonstrate a working exploit or confirmed attacks.

Executive priority

Treat as a high-priority kernel maintenance issue where untrusted users or workloads can run locally. Accelerate remediation on shared infrastructure and sensitive systems. For tightly controlled single-purpose hosts, schedule prompt vendor-approved updates while recognizing that the reported race is rare and exploitation is not confirmed.

Technical view

During generic radix-tree growth, two threads can race after allocating replacement nodes. If cmpxchg loses the race, the unused node may retain a pointer to the former root. Later reuse as a non-root node can leave the tree in an unsafe state. The kernel fix zeroes that node on the cmpxchg failure path.

Likely exposure

Potential exposure includes Linux systems running the affected versions or derived kernels, particularly multi-user systems, shared compute, containers, and other environments permitting local untrusted code. Exact exposure depends on distribution backports and whether relevant generic radix-tree operations can be reached; version strings alone may be misleading.

Exploitation context

The CVSS vector describes local access, low privileges, low complexity, and no user interaction, with potentially high impact across confidentiality, integrity, and availability. The source bundle marks this CVE as absent from KEV and provides no evidence of active exploitation or a public exploit.

Researcher notes

No CWE is assigned in the supplied record. The affected-version data is unusual, including duplicate commit identifiers and mixed release entries, so validate each vendor kernel by backport status. The evidence establishes a stale-pointer race and its fix, but does not establish a reliable exploitation primitive, privilege escalation, or observed attacks.

Mitigation direction

  • Install a vendor-supported kernel containing the applicable stable fix or distribution backport.
  • Prioritize multi-user hosts and systems that execute code from untrusted tenants or containers.
  • Restrict unnecessary local accounts and untrusted workload execution until kernels are updated.
  • Reboot into the corrected kernel after installation, following vendor operational guidance.

Validation and detection

  • Inventory running kernel versions across hosts, images, appliances, and recovery environments.
  • Check distribution advisories and package changelogs for a CVE-2024-47668 backport.
  • Confirm the running kernel includes the applicable stable commit, not merely an installed package.
  • Verify hosts rebooted successfully and now run the corrected kernel.
  • Review local-access controls and identify systems executing untrusted or tenant-supplied workloads.
Prepared
Confidence
medium
Sources
4

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-2024-47668 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/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
2ADP providers
9Source 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
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2024-47668Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/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.

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
LinuxLinuxba20ba2e3743bac786dff777954c11930256075e, ba20ba2e3743bac786dff777954c11930256075e, ba20ba2e3743bac786dff777954c11930256075e, ba20ba2e3743bac786dff777954c11930256075e, ba20ba2e3743bac786dff777954c11930256075e, ba20ba2e3743bac786dff777954c11930256075e, ba20ba2e3743bac786dff777954c11930256075eunaffected
LinuxLinux5.1, 0, 5.4.284, 5.10.226, 5.15.167, 6.1.110, 6.6.51, 6.10.10, 6.11affected
Weakness

CWE details

No CWE listed

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