FKIE_CVE-2026-90130

Vulnerability from fkie_nvd - Published: 2026-09-17 17:17 - Updated: 2026-09-17 17:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: vdpa_sim: fix cleanup after worker creation failure vdpasim_create() leaves vdpasim->worker as an ERR_PTR when kthread_run_worker() fails. The error path then drops the device reference, which releases the partially initialized simulator. vdpasim_free() unconditionally passes the worker pointer to kthread_destroy_worker(), so the ERR_PTR is dereferenced and can trigger a general protection fault. Store the worker error, clear the pointer, and only clean up the worker when it was successfully initialized. Also make the release path tolerate partially initialized objects by guarding virtqueue and IOTLB cleanup, since the same release path can be reached from other initialization failures. I found this bug myself, though the patch was written with AI assistance.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/05ddc94afb69e36df59e88cfa9e5c7bf9d10cfd0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/68b726b3a01fb02a68843781b17d05ef3d759987
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bd670e5dfd2b01fd9692f61fa1456434c54026a4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ca6f3fa599cb764518df595368b743f856fdb516
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/feafa109f031ed111f7f968e447c13985db498e0
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/vdpa/vdpa_sim/vdpa_sim.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "feafa109f031ed111f7f968e447c13985db498e0",
              "status": "affected",
              "version": "76acfa7bc54f1e3b9dde396e0a3534493419fd6f",
              "versionType": "git"
            },
            {
              "lessThan": "05ddc94afb69e36df59e88cfa9e5c7bf9d10cfd0",
              "status": "affected",
              "version": "76acfa7bc54f1e3b9dde396e0a3534493419fd6f",
              "versionType": "git"
            },
            {
              "lessThan": "68b726b3a01fb02a68843781b17d05ef3d759987",
              "status": "affected",
              "version": "76acfa7bc54f1e3b9dde396e0a3534493419fd6f",
              "versionType": "git"
            },
            {
              "lessThan": "ca6f3fa599cb764518df595368b743f856fdb516",
              "status": "affected",
              "version": "76acfa7bc54f1e3b9dde396e0a3534493419fd6f",
              "versionType": "git"
            },
            {
              "lessThan": "bd670e5dfd2b01fd9692f61fa1456434c54026a4",
              "status": "affected",
              "version": "76acfa7bc54f1e3b9dde396e0a3534493419fd6f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/vdpa/vdpa_sim/vdpa_sim.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvdpa_sim: fix cleanup after worker creation failure\n\nvdpasim_create() leaves vdpasim-\u003eworker as an ERR_PTR when\nkthread_run_worker() fails. The error path then drops the device\nreference, which releases the partially initialized simulator.\n\nvdpasim_free() unconditionally passes the worker pointer to\nkthread_destroy_worker(), so the ERR_PTR is dereferenced and can trigger\na general protection fault.\n\nStore the worker error, clear the pointer, and only clean up the worker\nwhen it was successfully initialized. Also make the release path tolerate\npartially initialized objects by guarding virtqueue and IOTLB cleanup,\nsince the same release path can be reached from other initialization\nfailures.\n\nI found this bug myself, though the patch was written with AI assistance."
    }
  ],
  "id": "CVE-2026-90130",
  "lastModified": "2026-09-17T17:17:05.493",
  "metrics": {},
  "published": "2026-09-17T17:17:05.493",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/05ddc94afb69e36df59e88cfa9e5c7bf9d10cfd0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/68b726b3a01fb02a68843781b17d05ef3d759987"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bd670e5dfd2b01fd9692f61fa1456434c54026a4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ca6f3fa599cb764518df595368b743f856fdb516"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/feafa109f031ed111f7f968e447c13985db498e0"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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