RDMA/umem: Fix double dma_buf_unpin in failure path

{
  "id": "375020bf86ccf7bdfea264c496502b7bca0e95fd21b8515eaa89edb81104ec98",
  "url": "https://osv.dev/vulnerability/CVE-2026-43128",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RDMA/umem: Fix double dma_buf_unpin in failure path",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: RDMA/umem: Fix double dma_buf_unpin in failure path In ib_umem_dmabuf_get_pinned_with_dma_device(), the call to ib_umem_dmabuf_map_pages() can fail. If this occurs, the dmabuf is immediately unpinned but the umem_dmabuf->pinned flag is still set. Then, when ib_umem_release() is called, it calls ib_umem_dmabuf_revoke() which will call dma_buf_unpin() again. Fix this by removing the immediate unpin upon failure and just let the ib_umem_release/revoke path handle it. This also ensures the proper unmap-unpin unwind ordering if the dmabuf_map_pages call happened to fail due to dma_resv_wait_timeout (and therefore has a non-NULL umem_dmabuf->sgt).",
    "evidence": "osv:CVE-2026-43128",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.165",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.128",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.75",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.16",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-43128",
      "aliases": [
        "CVE-2026-43128"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1e4df4a21c5ac722df1099eee30cad9246c889b5"
                },
                {
                  "fixed": "70542b69abff34d24b11ae0bb200cc7a766d18df"
                },
                {
                  "fixed": "b324327ff6f48d8065dca67eb3b91357e72726bd"
                },
                {
                  "fixed": "ba3bf0f1bf1d5d0404678485e872980532fcc2c4"
                },
                {
                  "fixed": "d3e32e2f3262f1b25d77c085ace38e2cc4ad75cf"
                },
                {
                  "fixed": "40126bcbefa79ea86672e05dae608596bab38319"
                },
                {
                  "fixed": "104016eb671e19709721c1b0048dd912dc2e96be"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43128.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.165"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.128"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.75"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.16"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "6.19.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43128.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.831378652Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/104016eb671e19709721c1b0048dd912dc2e96be",
        "https://git.kernel.org/stable/c/40126bcbefa79ea86672e05dae608596bab38319",
        "https://git.kernel.org/stable/c/70542b69abff34d24b11ae0bb200cc7a766d18df",
        "https://git.kernel.org/stable/c/b324327ff6f48d8065dca67eb3b91357e72726bd",
        "https://git.kernel.org/stable/c/ba3bf0f1bf1d5d0404678485e872980532fcc2c4",
        "https://git.kernel.org/stable/c/d3e32e2f3262f1b25d77c085ace38e2cc4ad75cf",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43128.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-43128",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43128.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-43128",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497855,
  "published_at": "2026-05-06T11:27:17.474+00:00"
}