CVE-2026-72474 (GCVE-0-2026-72474)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:15
VLAI
Title
dmaengine: dma-axi-dmac: use DMA pool to manange DMA descriptor
Summary
In the Linux kernel, the following vulnerability has been resolved: dmaengine: dma-axi-dmac: use DMA pool to manange DMA descriptor For architectures like Microblaze or arm64 (where this IP is used), DMA_DIRECT_REMAP is set which means that dma_alloc_coherent() might remap (and hence vmalloc()) some memory. This became visible in a design where dma_direct_use_pool() is not possible. With the above, when calling dma_free_coherent(), vunmap() would be called from softirq context and thus leading to a BUG(). To fix it, use a dma pool that is allocated in .device_alloc_chan_resources() and allocate blocks from it. The key point is that now dma_pool_free() is used in axi_dmac_free_desc() to free the blocks and that just frees the blocks from the pool in the sense they can be used again. In other words, no actual call to dma_free_coherent() happens. That only happens when destroying the pool in axi_dmac_free_chan_resources() which does not happen in any interrupt context.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3f8fd25936ee5f52596f10d420f650c5b5e3285f , < a4f41ceecfe68e117bae9c76c5ebc5e2b353fa56 (git)
Affected: 3f8fd25936ee5f52596f10d420f650c5b5e3285f , < c0e6bb2b0408fcac6382158ee2bd9fdc45eceee9 (git)
Affected: 3f8fd25936ee5f52596f10d420f650c5b5e3285f , < 65e82fa24965b2eb6ad9412f6c530ed9a50a625f (git)
Affected: 3f8fd25936ee5f52596f10d420f650c5b5e3285f , < 9e942c8579130e62734c14338e9f451780669164 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma/dma-axi-dmac.c"
          ],
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        {
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: dma-axi-dmac: use DMA pool to manange DMA descriptor\n\nFor architectures like Microblaze or arm64 (where this IP is used),\nDMA_DIRECT_REMAP is set which means that dma_alloc_coherent() might\nremap (and hence vmalloc()) some memory. This became visible in a design\nwhere dma_direct_use_pool() is not possible.\n\nWith the above, when calling dma_free_coherent(), vunmap() would be\ncalled from softirq context and thus leading to a BUG().\n\nTo fix it, use a dma pool that is allocated in\n.device_alloc_chan_resources() and allocate blocks from it. The key\npoint is that now dma_pool_free() is used in axi_dmac_free_desc() to\nfree the blocks and that just frees the blocks from the pool in the\nsense they can be used again. In other words, no actual call to\ndma_free_coherent() happens. That only happens when destroying the pool\nin axi_dmac_free_chan_resources() which does not happen in any interrupt\ncontext."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:15:23.275Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/9e942c8579130e62734c14338e9f451780669164"
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      ],
      "title": "dmaengine: dma-axi-dmac: use DMA pool to manange DMA descriptor",
      "x_generator": {
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      }
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72474",
    "datePublished": "2026-08-15T05:57:15.073Z",
    "dateReserved": "2026-08-09T03:40:39.934Z",
    "dateUpdated": "2026-08-17T05:15:23.275Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-09-21",
      "epss": "0.00209",
      "percentile": "0.11347"
    },
    "nvd": {
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        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: dma-axi-dmac: use DMA pool to manange DMA descriptor\n\nFor architectures like Microblaze or arm64 (where this IP is used),\nDMA_DIRECT_REMAP is set which means that dma_alloc_coherent() might\nremap (and hence vmalloc()) some memory. This became visible in a design\nwhere dma_direct_use_pool() is not possible.\n\nWith the above, when calling dma_free_coherent(), vunmap() would be\ncalled from softirq context and thus leading to a BUG().\n\nTo fix it, use a dma pool that is allocated in\n.device_alloc_chan_resources() and allocate blocks from it. The key\npoint is that now dma_pool_free() is used in axi_dmac_free_desc() to\nfree the blocks and that just frees the blocks from the pool in the\nsense they can be used again. In other words, no actual call to\ndma_free_coherent() happens. That only happens when destroying the pool\nin axi_dmac_free_chan_resources() which does not happen in any interrupt\ncontext."
          }
        ],
        "id": "CVE-2026-72474",
        "lastModified": "2026-08-17T06:19:15.430",
        "metrics": {},
        "published": "2026-08-15T06:22:21.563",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "vulnStatus": "Received"
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      "current_release_date": "2026-09-01T10:36:31+00:00",
      "cve": "CVE-2026-72474",
      "id": "CVE-2026-72474",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dmaengine: dma-axi-dmac: use DMA pool to manange DMA descriptor",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72474.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.