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CVE Record

CVE-2026-23135: wifi: ath12k: fix dma_free_coherent() pointer

In the Linux kernel, the following vulnerability has been resolved: wifi: ath12k: fix dma_free_coherent() pointer dma_alloc_coherent() allocates a DMA mapped buffer and stores the addresses in XXX_unaligned fields. Those should be reused when freeing the buffer rather than the aligned addresses.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2026-23135 is a Linux kernel Wi-Fi driver issue in ath12k. The driver could free a DMA buffer using the wrong pointer. The public record does not provide CVSS, impact details, or exploitation evidence, so urgency depends on whether affected kernels and ath12k-capable Wi-Fi hardware are present.

Executive priority

Handle through normal kernel patch management unless ath12k-enabled Wi-Fi is common in the environment. Escalate priority if vendors assign severity, affected fleets are large, or operational crashes are observed.

Technical view

The flaw is in Linux kernel ath12k DMA cleanup logic. dma_alloc_coherent() stores original unaligned allocation addresses, but the vulnerable code freed aligned addresses instead. Stable kernel commits correct dma_free_coherent() to use the original unaligned pointer values.

Likely exposure

Exposure is most likely on Linux systems running affected kernel versions with the ath12k driver built, loaded, or usable through supported Wi-Fi hardware. Systems without ath12k support or hardware are less likely to be exposed.

Exploitation context

The supplied sources do not show CISA KEV listing, public exploitation, exploit code, attacker prerequisites, or demonstrated impact. Treat this as a kernel memory-management vulnerability with incomplete public risk detail.

Researcher notes

The record lacks CVSS, CWE, explicit impact, and exploitability analysis. Research should focus on reachability of the free path, required hardware state, crash or corruption behavior, and distro-specific fixed kernel mappings.

Mitigation direction

  • Check Linux distribution or kernel vendor advisories for fixed packages.
  • Prioritize updates on systems using ath12k-supported Wi-Fi hardware.
  • Apply kernels containing the referenced stable fixes when available.
  • If no update is available, follow vendor guidance for temporary workarounds.

Validation and detection

  • Inventory kernel versions against the affected versions in the CVE record.
  • Check whether the ath12k driver is present, built, or loaded.
  • Confirm installed kernels include one of the referenced stable commits.
  • Regression test Wi-Fi functionality after kernel updates.
Prepared
Confidence
medium
Sources
6

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-2026-23135 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
3Timeline events
0ADP providers
5Source links

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.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxd889913205cf7ebda905b1e62c5867ed4e39f6c2, d889913205cf7ebda905b1e62c5867ed4e39f6c2, d889913205cf7ebda905b1e62c5867ed4e39f6c2, d889913205cf7ebda905b1e62c5867ed4e39f6c2unaffected
LinuxLinux6.3, 0, 6.6.122, 6.12.68, 6.18.8, 6.19affected
Weakness

CWE details

No CWE listed

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