CVE-2026-43283 (GCVE-0-2026-43283)
Vulnerability from cvelistv5
Published
2026-05-06 11:29
Modified
2026-08-05 12:27
Severity ?
8.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ethernet: ec_bhf: Fix dma_free_coherent() dma handle dma_free_coherent() in error path takes priv->rx_buf.alloc_len as the dma handle. This would lead to improper unmapping of the buffer. Change the dma handle to priv->rx_buf.alloc_phys.
References
Impacted products
Vendor Product Version
Linux Linux Version: 6af55ff52b02d492d45db88df3e461fa51a6f753
Version: 6af55ff52b02d492d45db88df3e461fa51a6f753
Version: 6af55ff52b02d492d45db88df3e461fa51a6f753
Version: 6af55ff52b02d492d45db88df3e461fa51a6f753
Version: 6af55ff52b02d492d45db88df3e461fa51a6f753
Version: 6af55ff52b02d492d45db88df3e461fa51a6f753
Version: 6af55ff52b02d492d45db88df3e461fa51a6f753
Version: 6af55ff52b02d492d45db88df3e461fa51a6f753
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/ec_bhf.c"
          ],
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          "vendor": "Linux",
          "versions": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "3.15"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.252",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.202",
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            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.165",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "6.6.128",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.252",
                  "versionStartIncluding": "3.15",
                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.202",
                  "versionStartIncluding": "3.15",
                  "vulnerable": true
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                  "vulnerable": true
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                {
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                {
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                {
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                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "3.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ethernet: ec_bhf: Fix dma_free_coherent() dma handle\n\ndma_free_coherent() in error path takes priv-\u003erx_buf.alloc_len as\nthe dma handle. This would lead to improper unmapping of the buffer.\n\nChange the dma handle to priv-\u003erx_buf.alloc_phys."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable path is reached by local netdevice administration via RTM_SETLINK or SIOCSIFFLAGS setting IFF_UP, which calls ec_bhf_open(). Received EtherCAT packets do not directly reach the bad dma_free_coherent() error path.\nAC:L - An attacker who can administer the netdev can repeatedly attempt link-up under memory pressure until TX coherent allocation fails after RX allocation succeeds. No race or external timing condition is required.\nPR:L - The path requires CAP_NET_ADMIN in the owning network namespace, and this physical netdev is movable because the driver does not mark it netns_immutable. In a reasonable delegated/container netns deployment, namespace admin privileges are sufficient.\nUI:N - No separate victim interaction is needed once the attacker has access to the local netlink/ioctl control path. The attacker can trigger the open error path directly with link-up attempts.\nS:C - The wrong DMA handle can leave a stale DMA/IOMMU mapping or free the wrong physical pages, allowing device DMA beyond the intended lifetime of the RX buffer. This crosses the intended DMA isolation boundary.\nC:H - Stale DMA access or freeing the wrong in-use pages can expose reused kernel memory through memory corruption. As a DMA lifetime/memory corruption issue, high confidentiality impact is defensible.\nI:H - The bug can let the device write received data into freed or incorrectly freed kernel memory, creating a kernel memory corruption primitive. Such corruption is potentially usable for arbitrary kernel memory modification or code execution.\nA:H - Passing an invalid DMA handle to dma_free_coherent() can corrupt allocator/IOMMU state or free the wrong pages. At minimum this can cause kernel warnings, oopses, or panics."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:27:03.376Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0f589ee54fd6d76d3f75e745f7f12c64cbd749e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/accd0599bc8e73b962247c6c6c70ca7aa1f8e8d0"
        },
        {
          "url": "https://git.kernel.org/stable/c/8320727be7ff704e07c87624efc2a4a75f54b3ce"
        },
        {
          "url": "https://git.kernel.org/stable/c/1e300c33ef3cc544c2b9c693778fe9490cfe9184"
        },
        {
          "url": "https://git.kernel.org/stable/c/1b1371cd4032ae859838ebc74215f569987bb197"
        },
        {
          "url": "https://git.kernel.org/stable/c/1b1d3c5d58a80a19d017a409aa2308162bab5bbf"
        },
        {
          "url": "https://git.kernel.org/stable/c/7e54ff938bebb173822b4c38b33fc164c1cabf92"
        },
        {
          "url": "https://git.kernel.org/stable/c/ffe68c3766997d82e9ccaf1cdbd47eba269c4aa2"
        }
      ],
      "title": "net: ethernet: ec_bhf: Fix dma_free_coherent() dma handle",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43283",
    "datePublished": "2026-05-06T11:29:03.726Z",
    "dateReserved": "2026-05-01T14:12:55.998Z",
    "dateUpdated": "2026-08-05T12:27:03.376Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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