Security readout for executives and security teams
Plain-English summary
A Linux Ethernet driver can fail to release DMA mappings after a transmission-mapping error. Repeated failures could consume resources and disrupt networking or system availability. Exposure appears limited to systems using the SpacemiT EMAC driver on affected kernels; the supplied evidence does not establish practical remote triggering.
Executive priority
Treat as a high-priority availability issue for exposed SpacemiT-based Linux systems, especially operationally critical devices. Broader Linux fleets are not automatically affected. Establish hardware and driver usage first, then patch confirmed exposure through normal kernel-vendor channels.
Technical view
The flaw is in emac_tx_mem_map() within the Linux SpacemiT network driver. When DMA mapping fails, mappings created earlier in the operation are leaked. The kernel fix invokes the existing emac_free_tx_buf() cleanup path. The CVSS 3.1 assessment is 7.5, with network attack vector and high availability impact.
Likely exposure
Prioritize Linux systems whose hardware and kernel use the SpacemiT EMAC driver. The supplied affected-version data references 6.18 through 7.0 but is ambiguous, so confirm exact distribution builds and backports with the relevant vendor.
Exploitation context
The CVE is not listed as KEV in the supplied bundle, and no cited evidence establishes active exploitation or a public proof of concept. Although the CVSS vector specifies network reachability, the sources do not explain how an attacker could reliably cause the DMA mapping-error path.
Researcher notes
The record attributes the issue to missing DMA cleanup during an error path and provides three stable-kernel fix commits. It supplies no CWE, trigger details, affected configuration identifier, exploit evidence, or reliable version-range semantics. Avoid inferring universal Linux exposure or proven remote denial of service from CVSS alone.
Mitigation direction
- Upgrade to a vendor kernel containing the applicable referenced stable fix.
- Check distribution advisories for backported fixes and exact affected build ranges.
- Reduce exposure of affected systems until remediation if availability is business-critical.
- Follow Linux or distribution vendor guidance where upgrade timing is constrained.
Validation and detection
- Identify systems using the SpacemiT EMAC driver and affected hardware.
- Record running kernel and distribution build versions on those systems.
- Verify the applicable stable fix is present or vendor-backported.
- Monitor affected systems for resource exhaustion, transmission failures, or unexplained network disruption.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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-2026-43462 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- 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
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.
CVSS vector scores
1 official scoreWe 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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6LinuxVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/c34ebd7b24ea70be3c6fdb6936f79f593f37df60CVE reference, Linux
- https://git.kernel.org/stable/c/edeaba385318f60ec1b32470da4d5eb800294d16CVE reference, Linux
- https://git.kernel.org/stable/c/86292155bea578ebab0ca3b65d4d87ecd8a0e9eaCVE reference, Linux
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.