{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "4bf5beef578e46393f11eb69dda7d17a065e05ff"
            },
            {
              "fixed": "f2f65b28d802a667119147444ec2ae33eebf9a58"
            },
            {
              "fixed": "715c263119fd1b918a9fcbd8a36ea5b604a46324"
            },
            {
              "fixed": "e15768e68820142077bbca402d8e902f64ade1b0"
            },
            {
              "fixed": "496269d12072ecb219826485bdbec70c92a8eef5"
            },
            {
              "fixed": "d2a0cac10597068567d336e85fa3cbdbe8ca62bf"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.9.0"
            },
            {
              "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"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43253.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: move wait_on_sem() out of spinlock\n\nWith iommu.strict=1, the existing completion wait path can cause soft\nlockups under stressed environment, as wait_on_sem() busy-waits under the\nspinlock with interrupts disabled.\n\nMove the completion wait in iommu_completion_wait() out of the spinlock.\nwait_on_sem() only polls the hardware-updated cmd_sem and does not require\niommu-\u003elock, so holding the lock during the busy wait unnecessarily\nincreases contention and extends the time with interrupts disabled.",
  "id": "CVE-2026-43253",
  "modified": "2026-07-08T05:36:24.151953153Z",
  "published": "2026-05-06T11:28:43.160Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/496269d12072ecb219826485bdbec70c92a8eef5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/715c263119fd1b918a9fcbd8a36ea5b604a46324"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2a0cac10597068567d336e85fa3cbdbe8ca62bf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e15768e68820142077bbca402d8e902f64ade1b0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f2f65b28d802a667119147444ec2ae33eebf9a58"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43253.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43253"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "iommu/amd: move wait_on_sem() out of spinlock"
}