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CVE Record

CVE-2024-40986: dmaengine: xilinx: xdma: Fix data synchronisation in xdma_channel_isr()

In the Linux kernel, the following vulnerability has been resolved: dmaengine: xilinx: xdma: Fix data synchronisation in xdma_channel_isr() Requests the vchan lock before using xdma->stop_request.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A synchronization error in Linux’s Xilinx XDMA driver could let a local, low-privileged user compromise confidentiality, integrity, or availability on an affected system. Exposure appears limited to machines using the relevant driver. The supplied sources do not establish active exploitation.

Executive priority

Treat this as a targeted high-priority kernel update for systems using Xilinx XDMA, especially multi-user or locally accessible hosts. It does not justify fleet-wide emergency action without confirming driver exposure. No active exploitation is established by the supplied evidence.

Technical view

The XDMA interrupt handler used xdma->stop_request without first acquiring the virtual-channel lock. The cited kernel changes add locking to synchronize access. CVSS 3.1 rates the issue 7.8: local access, low privileges, low complexity, no user interaction, and potentially high impact across confidentiality, integrity, and availability.

Likely exposure

Potential exposure is limited to Linux systems running an affected kernel and using the Xilinx XDMA dmaengine driver. Ordinary Linux systems without this driver are unlikely to reach the vulnerable path. The bundle’s flattened version data is ambiguous, so confirm exposure using kernel commits and distribution advisories rather than version strings alone.

Exploitation context

CISA KEV status is false, and the supplied sources provide no evidence of active exploitation or a public exploit. The CVSS vector describes a local, low-privileged attack requiring no user interaction. The sources do not explain the practical exploitation conditions or demonstrate the scored impacts.

Researcher notes

This is a locking correction in xdma_channel_isr(), specifically acquiring the virtual-channel lock before accessing stop_request. No CWE is supplied. Two stable-kernel commits are cited, suggesting branch-specific fixes. Exact affected-version interpretation is uncertain because the provided version list lacks normalized range semantics; inspect commit ancestry or distribution backports.

Mitigation direction

  • Update to a vendor-supported kernel containing the applicable cited synchronization fix.
  • Check Linux distribution advisories for branch-specific package versions and backported fixes.
  • Prioritize systems where the Xilinx XDMA driver is loaded and accessible to untrusted local users.
  • Restrict unnecessary local access while affected systems await an approved kernel update.

Validation and detection

  • Inventory kernel versions and determine whether the Xilinx XDMA driver is present or loaded.
  • Compare kernel source or package metadata with fixes 8e1f54e4a3f3 and 462237d2d93f.
  • Confirm applicable distribution packages include the fix despite possible version-number differences.
  • After updating, verify the intended kernel is running and reassess driver exposure.
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.

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CVE-2024-40986 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
3Source 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-2024-40986Attack 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

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux6a40fb8245965b481b4dcce011cd63f20bf91ee0, 6a40fb8245965b481b4dcce011cd63f20bf91ee0, 582ce5d734190d74e5ce9cd711cf6e964e1e7b29, 6.8.9unaffected
LinuxLinux6.9, 0, 6.9.7, 6.10affected
Weakness

CWE details

No CWE listed

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