FKIE_CVE-2026-64033

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-07-20 15:17
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/rtrs: Fix use-after-free in path file creation cleanup In the error path of rtrs_srv_create_path_files(), the sysfs root folders may already have been created and srv_path->kobj may already have been initialized. If a later step fails, the cleanup currently calls kobject_put(&srv_path->kobj) before rtrs_srv_destroy_once_sysfs_root_folders(srv_path). kobject_put() may drop the last reference to srv_path->kobj and invoke the release callback, rtrs_srv_release(), which frees srv_path. The following call to rtrs_srv_destroy_once_sysfs_root_folders(srv_path) then dereferences srv_path internally to access srv_path->srv, resulting in a use-after-free. This failure path is reached before rtrs_srv_create_path_files() returns success, so the successful-path lifetime handling is not involved. Fix this by destroying the sysfs root folders before calling kobject_put(&srv_path->kobj), so srv_path is still valid while the helper accesses it. This issue was found by a static analysis tool I am developing.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/00904a73272b9f3ef3952fe69a833909dccad1ef
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/01e42aabaf7632beb4bf235c7238b96c746d4144
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/548f3956e53a7f7bde912d8129010b8986d5e602
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5b74373390113fba798a76b483837029ab010fef
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/92060ab1c5115674cf319175550f85f68405121f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b0e9706fb2859064bb6c677554c4d20c713aa8e0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eae62c5451e67e8b033c1681fd3b85d7e9a9a28f
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "01e42aabaf7632beb4bf235c7238b96c746d4144",
              "status": "affected",
              "version": "bab17b761c8974a869b04462be5d4dd9aad366b4",
              "versionType": "git"
            },
            {
              "lessThan": "548f3956e53a7f7bde912d8129010b8986d5e602",
              "status": "affected",
              "version": "ae4c81644e9105d9f7f713bb0d444737bb6a0cf1",
              "versionType": "git"
            },
            {
              "lessThan": "00904a73272b9f3ef3952fe69a833909dccad1ef",
              "status": "affected",
              "version": "ae4c81644e9105d9f7f713bb0d444737bb6a0cf1",
              "versionType": "git"
            },
            {
              "lessThan": "92060ab1c5115674cf319175550f85f68405121f",
              "status": "affected",
              "version": "ae4c81644e9105d9f7f713bb0d444737bb6a0cf1",
              "versionType": "git"
            },
            {
              "lessThan": "eae62c5451e67e8b033c1681fd3b85d7e9a9a28f",
              "status": "affected",
              "version": "ae4c81644e9105d9f7f713bb0d444737bb6a0cf1",
              "versionType": "git"
            },
            {
              "lessThan": "b0e9706fb2859064bb6c677554c4d20c713aa8e0",
              "status": "affected",
              "version": "ae4c81644e9105d9f7f713bb0d444737bb6a0cf1",
              "versionType": "git"
            },
            {
              "lessThan": "5b74373390113fba798a76b483837029ab010fef",
              "status": "affected",
              "version": "ae4c81644e9105d9f7f713bb0d444737bb6a0cf1",
              "versionType": "git"
            },
            {
              "lessThan": "5.15.209",
              "status": "affected",
              "version": "5.15.61",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/ulp/rtrs/rtrs-srv-sysfs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.142",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.92",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "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\nRDMA/rtrs: Fix use-after-free in path file creation cleanup\n\nIn the error path of rtrs_srv_create_path_files(), the sysfs root folders\nmay already have been created and srv_path-\u003ekobj may already have been\ninitialized. If a later step fails, the cleanup currently calls\nkobject_put(\u0026srv_path-\u003ekobj) before\nrtrs_srv_destroy_once_sysfs_root_folders(srv_path).\n\nkobject_put() may drop the last reference to srv_path-\u003ekobj and invoke the\nrelease callback, rtrs_srv_release(), which frees srv_path. The following\ncall to rtrs_srv_destroy_once_sysfs_root_folders(srv_path) then\ndereferences srv_path internally to access srv_path-\u003esrv, resulting in a\nuse-after-free.\n\nThis failure path is reached before rtrs_srv_create_path_files() returns\nsuccess, so the successful-path lifetime handling is not involved.\n\nFix this by destroying the sysfs root folders before calling\nkobject_put(\u0026srv_path-\u003ekobj), so srv_path is still valid while the helper\naccesses it.\n\nThis issue was found by a static analysis tool I am developing."
    }
  ],
  "id": "CVE-2026-64033",
  "lastModified": "2026-07-20T15:17:04.210",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-07-19T16:17:43.493",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/00904a73272b9f3ef3952fe69a833909dccad1ef"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/01e42aabaf7632beb4bf235c7238b96c746d4144"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/548f3956e53a7f7bde912d8129010b8986d5e602"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5b74373390113fba798a76b483837029ab010fef"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/92060ab1c5115674cf319175550f85f68405121f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/b0e9706fb2859064bb6c677554c4d20c713aa8e0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/eae62c5451e67e8b033c1681fd3b85d7e9a9a28f"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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