GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-74574 (GCVE-0-2026-74574)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:28 – Updated: 2026-08-17 05:48
VLAI
Title
dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()
Summary
In the Linux kernel, the following vulnerability has been resolved: dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open() The failed_dev_add and failed_dev_name paths drop the file-device reference while wq->wq_lock is still held. If put_device(fdev) drops the last reference, idxd_file_dev_release() runs synchronously and tries to take wq->wq_lock again, deadlocking. Those paths also fall through into the later ctx cleanup labels even though idxd_file_dev_release() owns that cleanup and frees ctx. This can make idxd_xa_pasid_remove(ctx) and kfree(ctx) operate on a freed context. Move idxd_wq_get() before file-device setup can fail, since the release callback always calls idxd_wq_put(). Then unlock wq->wq_lock before put_device(fdev) and return directly from the file-device setup failure path, leaving ctx cleanup to the release callback.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec , < 778ccbded2c8749c5be7f0dfa04fc9977a36fb7e (git)
Affected: e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec , < 8d5d28285728be47c82fdf1c48be4268293c90e7 (git)
Affected: e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec , < 0679c0c189d2548f00e1bac95be28e2df5c6c7f7 (git)
Affected: e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec , < 6e26a41c4c1a706edaaa7c7dffc6b3b945707a55 (git)
Affected: e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec , < ee1d7274102285d78a53161fc705a8d8cd40b066 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma/idxd/cdev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "778ccbded2c8749c5be7f0dfa04fc9977a36fb7e",
              "status": "affected",
              "version": "e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec",
              "versionType": "git"
            },
            {
              "lessThan": "8d5d28285728be47c82fdf1c48be4268293c90e7",
              "status": "affected",
              "version": "e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec",
              "versionType": "git"
            },
            {
              "lessThan": "0679c0c189d2548f00e1bac95be28e2df5c6c7f7",
              "status": "affected",
              "version": "e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec",
              "versionType": "git"
            },
            {
              "lessThan": "6e26a41c4c1a706edaaa7c7dffc6b3b945707a55",
              "status": "affected",
              "version": "e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec",
              "versionType": "git"
            },
            {
              "lessThan": "ee1d7274102285d78a53161fc705a8d8cd40b066",
              "status": "affected",
              "version": "e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/dma/idxd/cdev.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": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.151",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.103",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.44",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()\n\nThe failed_dev_add and failed_dev_name paths drop the file-device\nreference while wq-\u003ewq_lock is still held. If put_device(fdev) drops the\nlast reference, idxd_file_dev_release() runs synchronously and tries to\ntake wq-\u003ewq_lock again, deadlocking.\n\nThose paths also fall through into the later ctx cleanup labels even\nthough idxd_file_dev_release() owns that cleanup and frees ctx. This can\nmake idxd_xa_pasid_remove(ctx) and kfree(ctx) operate on a freed context.\n\nMove idxd_wq_get() before file-device setup can fail, since the release\ncallback always calls idxd_wq_put(). Then unlock wq-\u003ewq_lock before\nput_device(fdev) and return directly from the file-device setup failure\npath, leaving ctx cleanup to the release callback."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The flaw is reached only through the local open() syscall on an Intel DSA/IDXD user workqueue character device (/dev/dsa/wq* or /dev/iax/wq*); idxd_cdev_open() is the cdev .open handler and is not reachable from any network-facing kernel service.\nAC:L - An attacker who can open the cdev can reliably hit the failed_dev_name/failed_dev_add cleanup by inducing GFP_KERNEL allocation failures (e.g., memory pressure) during device setup; no race or victim-controlled state beyond that is required.\nPR:L - Exploitation requires only local permission to open the configured user-type DSA workqueue cdev, which on DSA-equipped servers is commonly granted to unprivileged workload/service accounts via udev group ACLs after one-time admin WQ setup, not init-namespace root.\nUI:N - The attacker triggers the bug by opening the character device themselves; no additional end-user or administrator interaction is required at exploitation time beyond prior WQ enablement.\nS:U - The deadlock, use-after-free, and double-free corrupt kernel/IDXD driver heap state and block the affected workqueue; impact does not cross VM, IOMMU/DMA, or other security boundaries into a separate authority.\nC:H - On the error path put_device() synchronously runs idxd_file_dev_release(), which kfree()s ctx while idxd_cdev_open() still references it via filp-\u003eprivate_data, and the fall-through path can call idxd_xa_pasid_remove()/kfree() again\u2014classic kernel heap UAF enabling memory disclosure.\nI:H - Double-free and use-after-free of the kmalloc-backed idxd_user_context can corrupt slab metadata and be developed into arbitrary kernel memory writes and privilege escalation, not merely a controlled error return.\nA:H - Calling put_device() while holding wq-\u003ewq_lock deadlocks when idxd_file_dev_release() re-acquires that mutex, hanging the opener and blocking all other users of the workqueue; heap corruption can additionally panic the kernel."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:48:53.873Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/778ccbded2c8749c5be7f0dfa04fc9977a36fb7e"
        },
        {
          "url": "https://git.kernel.org/stable/c/8d5d28285728be47c82fdf1c48be4268293c90e7"
        },
        {
          "url": "https://git.kernel.org/stable/c/0679c0c189d2548f00e1bac95be28e2df5c6c7f7"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e26a41c4c1a706edaaa7c7dffc6b3b945707a55"
        },
        {
          "url": "https://git.kernel.org/stable/c/ee1d7274102285d78a53161fc705a8d8cd40b066"
        }
      ],
      "title": "dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74574",
    "datePublished": "2026-08-15T12:28:12.558Z",
    "dateReserved": "2026-08-15T05:44:03.917Z",
    "dateUpdated": "2026-08-17T05:48:53.873Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-74574",
      "date": "2026-09-04",
      "epss": "0.00122",
      "percentile": "0.02262"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-23T14:43:49.000Z",
      "cve": "CVE-2026-74574",
      "id": "msrc_CVE-2026-74574",
      "initial_release_date": "2026-08-23T14:43:49.000Z",
      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74574.json",
      "version": "1"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-74574\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-15T13:18:03.063\",\"lastModified\":\"2026-08-17T06:19:55.750\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()\\n\\nThe failed_dev_add and failed_dev_name paths drop the file-device\\nreference while wq-\u003ewq_lock is still held. If put_device(fdev) drops the\\nlast reference, idxd_file_dev_release() runs synchronously and tries to\\ntake wq-\u003ewq_lock again, deadlocking.\\n\\nThose paths also fall through into the later ctx cleanup labels even\\nthough idxd_file_dev_release() owns that cleanup and frees ctx. This can\\nmake idxd_xa_pasid_remove(ctx) and kfree(ctx) operate on a freed context.\\n\\nMove idxd_wq_get() before file-device setup can fail, since the release\\ncallback always calls idxd_wq_put(). Then unlock wq-\u003ewq_lock before\\nput_device(fdev) and return directly from the file-device setup failure\\npath, leaving ctx cleanup to the release callback.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/dma/idxd/cdev.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec\",\"lessThan\":\"778ccbded2c8749c5be7f0dfa04fc9977a36fb7e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec\",\"lessThan\":\"8d5d28285728be47c82fdf1c48be4268293c90e7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec\",\"lessThan\":\"0679c0c189d2548f00e1bac95be28e2df5c6c7f7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec\",\"lessThan\":\"6e26a41c4c1a706edaaa7c7dffc6b3b945707a55\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e6fd6d7e5f0fe4a17a08e892afb5db800e7794ec\",\"lessThan\":\"ee1d7274102285d78a53161fc705a8d8cd40b066\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/dma/idxd/cdev.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.4\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.4\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0679c0c189d2548f00e1bac95be28e2df5c6c7f7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6e26a41c4c1a706edaaa7c7dffc6b3b945707a55\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/778ccbded2c8749c5be7f0dfa04fc9977a36fb7e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8d5d28285728be47c82fdf1c48be4268293c90e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ee1d7274102285d78a53161fc705a8d8cd40b066\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-03T20:46:37+00:00",
      "cve": "CVE-2026-74574",
      "id": "CVE-2026-74574",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dmaengine: idxd: fix fdev setup failure cleanup in idxd_cdev_open()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74574.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.