GHSA-JQX2-5F2V-644H

Vulnerability from github – Published: 2026-05-06 12:30 – Updated: 2026-05-08 15:31
VLAI?
Details

In the Linux kernel, the following vulnerability has been resolved:

iommu/amd: move wait_on_sem() out of spinlock

With iommu.strict=1, the existing completion wait path can cause soft lockups under stressed environment, as wait_on_sem() busy-waits under the spinlock with interrupts disabled.

Move the completion wait in iommu_completion_wait() out of the spinlock. wait_on_sem() only polls the hardware-updated cmd_sem and does not require iommu->lock, so holding the lock during the busy wait unnecessarily increases contention and extends the time with interrupts disabled.

Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-43253"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-667"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-06T12:16:46Z",
    "severity": "HIGH"
  },
  "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": "GHSA-jqx2-5f2v-644h",
  "modified": "2026-05-08T15:31:18Z",
  "published": "2026-05-06T12:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43253"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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