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CVE Record

CVE-2024-56662: acpi: nfit: vmalloc-out-of-bounds Read in acpi_nfit_ctl

In the Linux kernel, the following vulnerability has been resolved: acpi: nfit: vmalloc-out-of-bounds Read in acpi_nfit_ctl Fix an issue detected by syzbot with KASAN: BUG: KASAN: vmalloc-out-of-bounds in cmd_to_func drivers/acpi/nfit/ core.c:416 [inline] BUG: KASAN: vmalloc-out-of-bounds in acpi_nfit_ctl+0x20e8/0x24a0 drivers/acpi/nfit/core.c:459 The issue occurs in cmd_to_func when the call_pkg->nd_reserved2 array is accessed without verifying that call_pkg points to a buffer that is appropriately sized as a struct nd_cmd_pkg. This can lead to out-of-bounds access and undefined behavior if the buffer does not have sufficient space. To address this, a check was added in acpi_nfit_ctl() to ensure that buf is not NULL and that buf_len is less than sizeof(*call_pkg) before accessing it. This ensures safe access to the members of call_pkg, including the nd_reserved2 array.

MediumCVSS 6Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

A flaw in Linux kernel ACPI NFIT handling can read outside allocated memory when processing a malformed command package. Because the CVSS vector requires local access and high privileges, this is mainly a concern on managed Linux systems where privileged local users or services can reach this path. Potential impact includes information exposure and kernel instability.

Executive priority

Treat as a moderate-priority kernel maintenance item. It has meaningful confidentiality and availability impact, but available evidence points to local, high-privilege access requirements and no confirmed active exploitation. Patch through normal security update processes, faster for multi-user or privileged workload hosts.

Technical view

CVE-2024-56662 is a CWE-125 out-of-bounds read in drivers/acpi/nfit/core.c. acpi_nfit_ctl could access call_pkg->nd_reserved2 before confirming the supplied buffer was large enough for struct nd_cmd_pkg. The kernel fix adds NULL and length validation before cmd_to_func processing. CVSS 3.1 is 6.0 with local, high-privilege exploitation.

Likely exposure

Exposure is likely limited to Linux systems running affected kernels where ACPI NFIT/NVDIMM-related kernel code is present and reachable by a high-privilege local actor. The source bundle lists Linux kernel affected ranges but does not identify specific distributions beyond Debian LTS advisories.

Exploitation context

The source bundle and KEV flag do not support active exploitation claims. The issue was detected by syzbot with KASAN, suggesting a fuzzing-discovered memory safety bug rather than documented in-the-wild abuse. Exploitation requires local access and high privileges according to the CVSS vector.

Researcher notes

The key boundary is buffer validation before interpreting user-supplied command package data as struct nd_cmd_pkg. Evidence names an out-of-bounds read in cmd_to_func/acpi_nfit_ctl and a fix adding NULL and size checks. Source data does not provide a public exploit or broad workaround.

Mitigation direction

  • Prioritize vendor kernel updates for affected Linux systems.
  • Confirm distribution advisories map to the stable kernel fixes.
  • For Debian LTS, review the cited March 2025 announcements.
  • If no packaged fix exists, follow vendor guidance for supported kernel branches.
  • Limit high-privilege local access on affected hosts.

Validation and detection

  • Inventory Linux kernel versions across servers and appliances.
  • Check whether deployed kernels fall within affected ranges listed by CVE data.
  • Verify installed kernels include the relevant stable fix commits.
  • Review distribution security advisories for backported fixes.
  • Assess whether systems use ACPI NFIT or NVDIMM-related functionality.
Prepared
Confidence
high
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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cwe · low confidence lookup

CWE-125: Exact CWE lookup

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cve · low confidence lookup

CVE-2024-56662 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
6 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/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
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
6CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H0.85.2CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

6Medium
CVSS 3.1 vector shape for CVE-2024-56662Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/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
cvssV3_1other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxebe9f6f19d80d8978d16078dff3d5bd93ad8d102, ebe9f6f19d80d8978d16078dff3d5bd93ad8d102, ebe9f6f19d80d8978d16078dff3d5bd93ad8d102, ebe9f6f19d80d8978d16078dff3d5bd93ad8d102, ebe9f6f19d80d8978d16078dff3d5bd93ad8d102, ebe9f6f19d80d8978d16078dff3d5bd93ad8d102, 63108f2a408abea7ecab063efa0f398da4d0d14b, f5878c4f084dc6b1386dad03970bb61ad5e9dc4b, 0c79794474895dbbc3c52225f7e9f73cfecbb7dd, 4.14.176, 4.19.31, 5.0.4unaffected
LinuxLinux5.1, 0, 5.10.232, 5.15.175, 6.1.121, 6.6.67, 6.12.6, 6.13affected
Weakness

CWE details

CWE-125

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

CWE-125 · source CWE mapping

Out-of-bounds Read

Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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